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Explore Machine Learning (ML) is a Google-sponsored program for university students to get started with Machine Learning.
📆 Date: 7 January 2020
⌛ Time: 1.00pm to 6.00pm
📍 Location: Think Tank 17
SIGN UP
In this 2x half day workshop, participants will get a hands-on introduction to deep learning with TensorFlow 2.0, covering key basics in computer vision and natural language processing
📆 Date: 8 January & 13 January 2020
⌛ Time: 1.30pm to 3.30pm
📍 Location: Think Tank 16 (8 Jan) and Think Tank 11 (13 Jan)
SIGN UP
📆 Date: 8-10, 13 & 15 January 2020
⌛ Time: 4.00pm to 6.00pm
📍 Location: TBC
Full event details & sign up link here
Participants will be introduced to the markup language Markdown via GitHub Flavored Markdown and Typora, as well as MkDocs, a static site generator that is geared towards building project documentation.
Markdown provides a more efficient and streamlined way of formatting documents. There will be a short introduction to Pandoc, a universal document converter which can convert between many markup formats.
Using Markdown together with Python, participants can learn how to create a technical documentation site using MkDocs. The site can be built and served on GitHub Pages.
📆 Date: 9 January 2020
⌛ Time: 10.30 am to 12.30pm
📍 Location: TBC
SIGN UP
Ever wondered how Telegram Bots like WereWolfBot run elaborate games with nothing but text messages? Come down to learn how programmers like you can leverage cloud providers to make always-online Telegram bots that respond to your clients
even when you're sleeping. Finally, re-enact the best use of Computer Vision in human history – a Hotdog/NotHotdog bot – by making a bot that tells you whether the photos you take of food contain a hotdog or not. Comes with free hotdogs to
test your bot!
📆 Date: 9 January 2020 -> 13 & 15 January 2020
⌛ Time: 1.00pm to 3.00pm -> 10.00am to 12.00am
📍 Location: Think Tank 17
Full event details & sign up link here
Start your journey into software development by creating android applications
📆 Date: 8, 10 January 2020 -> 15 January 2020
⌛ Time: 9.30am to 12.00pm -> 1.00pm to 3.30pm
📍 Location: TBC
SIGN UP
Participants will be introduced to the wide variety of competitive programming events, online and offline, and how to tackle them. Practicing competitive programming helps you to pass junior-level technical interviews, and builds
problem-solving resilience and skills. Participants would need to already know how to use strings, lists, and dictionaries in Python.
📆 Date: 10 January 2020
⌛ Time: 1.00pm to 3.00pm
📍 Location: Think Tank 17
SIGN UP
Participants will be introduced to Swift Development (Apple), and Google FireBase fast-tracks for easy prototyping in hackathons
📆 Date: 14 January 2020
⌛ Time: 1.00pm to 4.00pm
📍 Location: Albert Hong Lecture Theatre
SIGN UP
This course will introduce blockchain concepts and smart contract programming to participants. Participants will learn to be conversant in blockchain technology and build their first decentralised application. Participants will also learn
what are some key applications of blockchain technology.
📆 Date: 16 & 17 January 2020
⌛ Time: 10.00am to 6.00pm
📍 Location: TBC
SIGN UP
A text editor is important to all who edit text. While being a programmer's vital tool of the trade, it's importance extends beyond just programming (all pillars, not just ISTD).
In this workshop, we will be running through the basics of Emacs (text editor) to get you started on your feet. We will also be introducing Emacs' vast array of features not limited to hierachical note-taking, literate programming with
python, interfacing with Git, writing Latex documents, et cetera (depending on the audience). And showcasing real-world (SUTD) use-cases for these features.
📆 Date: 23 January
⌛ Time: 7.00pm to 9.00pm
📍 Location: Think Tank 17
SIGN UP


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UK police to investigate assault after Hong Kong Justice Sec. Teresa Cheng injured in fall, prompting China’s criticism
by AFPPolice in London on Friday said they were investigating an assault after a Hong Kong minister fell to the ground as she was jostled by demonstrators.
Justice secretary Teresa Cheng had been due to give a lecture at the Chartered Institute of Arbitrators (CIArb) in Bloomsbury Square, central London, on Thursday evening.
But the CIArb said the event was cancelled because “whilst entering the building (Cheng) was assaulted by a crowd”. It added: “As a result she sustained an injury to her arm.”
Video of the incident circulating on social media shows Cheng being surrounded by jeering pro-democracy protesters, who followed her through the streets near the CIArb headquarters.
She fell to the ground and was then escorted away.
China called the incident an “appalling attack” and urged London to provide better security.
The CIArb said it was “committed to peacefully resolving conflict and deplores the use of violence, particularly to a guest to the United Kingdom”.
The Metropolitan Police said in a statement a probe was “ongoing to establish the full circumstances” of the incident, adding no arrests had been so made far.
“A woman was taken to hospital by London Ambulance Service suffering an injury to her arm,” it added without confirming Cheng’s identity.
Hong Kong has seen relentless protests since June as many in the city of 7.5 million people have vented fury at eroding freedoms under Chinese rule.
Cheng is in London on a visit to promote its role as a dispute resolution and deal-making hub.
She is one of the most unpopular government officials in Hong Kong, seen as playing a key role in pushing forward the now-shelved extradition bill to China, which sparked the months of unrest there.
Hong Kong Free Press relies on direct reader support. Help safeguard independent journalism and press freedom as we invest more in freelancers, overtime, safety gear & insurance during this summer’s protests. 10 ways to support us.


d3.js
, Version 5.x, Force Layout primer
For study purposes only
Sought to clean up an example from :
https://bl.ocks.org/mbostock/1095795/8f34afdd6d321b71ca6b3a5904e486f3173f1111 Original example license : https://opensource.org/licenses/GPL-3.0
Fix option 1: subsequently assisted by Mihael Ankerst:
https://bl.ocks.org/EE2dev/e653b5c781b642c164bd4710031243ca Assisted solution license : https://opensource.org/licenses/MIT
Fix option 2: subsequently assisted by Brian Wong:
https://bl.ocks.org/brianwfl88/459b2ef7344e8d63239365b62aa454a9 Assisted solution license : https://opensource.org/licenses/GPL-3.0
Cleaned up example uses d3 version 5.
Original example uses d3 version 4.


Introduction
Whom this book is for?
Errata
Chapter 1
What you will learn in this chapter
Summary
Chapter 2
Recap
Conclusion


Peer information returned by the server.
More...
|
| string | Id [get, set] |
| | Peer id. More...
|
| |
| string | Address [get, set] |
| | Peer address. More...
|
| |
| PeerAddressState | AddressState [get, set] |
| | Peer address state. More...
|
| |
| PeerConnectionState? | ConnectionState [get, set] |
| | Peer connection state. More...
|
| |
| int? | Version [get, set] |
| | Node version the peer is running. More...
|
| |
| int? | TimeOffset [get, set] |
| | Time offset with the peer (in miliseconds). More...
|
| |
| Hash | HeadHash [get, set] |
| | Hash of the head block of the peer. More...
|
| |
| int? | Latency [get, set] |
| | Latency to the peer. More...
|
| |
| int? | Rx [get, set] |
| | Received bytes. More...
|
| |
| int? | Tx [get, set] |
| | Sent bytes. More...
|
| |
Peer information returned by the server.
◆ Address
| string Nimiq.Peer.Address |
|
getset |
◆ AddressState
◆ ConnectionState
◆ HeadHash
Hash of the head block of the peer.
◆ Id
◆ Latency
◆ Rx
◆ TimeOffset
| int? Nimiq.Peer.TimeOffset |
|
getset |
Time offset with the peer (in miliseconds).
◆ Tx
◆ Version
Node version the peer is running.
The documentation for this class was generated from the following file:
- NimiqClient/NimiqClient.cs


Contrôlez votre divertissement par simple commande vocale : écoutez des titres en streaming sur Amazon Music, Apple Music, Spotify, Deezer et bien plus.
Control your connected home: use your voice to turn on lights, set the thermostat and lock doors with compatible devices.
Make hands-free calls to almost all your contacts, call other rooms via Drop In or tell the whole house that dinner is ready.


ShareYourSystem
What is the thing here : ShareYourSystem would like to make deeper thinkings about :
-
what should be a good human readable syntax in Python for sharing scientific objects. Hoping even for a mathematical demonstration like logic when rules of writing are clearly defined. Here the syntax of "Doers" is chosen. The arguments for a certain scope of a class that will maybe then derived into an other class have a prefix string
, and controls the methods applications that set then instances variables. Then a framework for decorating class (like a Propertizer for enhancing automatic binding in a process), methods (like a Hooker for calling synchronously a suite of hooked methods) and defining effective objects, is logically derived from this base of concept. -
how can we build an object oriented frameworks leading to a LabView or MaxMsp ontology like helping for wrapping any kind of complex and specialized already developped python modules, like brian (for network simulations), music21 for music analysing, scikit...
-
what should be the first way of sharing static files on repositories that automatically propose attests and tests and readme, thanks to the nb converter in ipython that can markdowns and deploy code,latex cells.
-
how facilitates the scientific templating result attestations (following the pypet philosophy) with a hierarching model view controller framework based on client side "db like", like hdf5 and deploy data on django, mySQL more robust server side db.
-
how would participate to the work of annotating webs scientific proofs mediated in public journals (and even scientific journals for which peer-review system exists but only at the lookup of the text and the figures, not at the code level), when blogs feedbacks systems straightforwardly are quickly dived in the 'soup discussion problem'. And avoiding also at the same time the spaghetti code problem if proofs requires code writings, so here is a proposition : annotations like hypothesis claimes to be could be decorated by direct Javacript API - Python mediated : thanks to new js frameworks like Meteor for quickly settings reactive templates of SVG or html objects that can helps for representing abstractions coded in python, a proof of a scientific result can be joined to a meteor web page where Client side Python processes can directly tests the attests. But then comes the tricky question on how synchronizes python processes with js web pages... And here is not the expert place for deciding. For now, all the propositions are in the prototype process even waiting for the framework to be devleopped by other hackers.
-
The first simplest solution is thinking on a server side python tester, when statging on the meteor web page. In such a way : Meteor with the meteorite npm package for loading a python shell and a zerorpc TCP communication should be adapted. But here it gees for a sharing project at the level of a small team... Making crashing the server if too much python processes are running.
-
Then comes more the idea of relieving the server by making the client running by itself the test codes...But here therefore special modules for testing should be installed by everyone. In that case, even the way to implement that is still tricky as long as a js page session cannot talk with a running python on the same computer for safety.
- But still, a ddp communication through our python or ipython notebook to set things on the server that will then callbacks for setting our session is possible thanks to pyddp (and possibly python-meteor but it's still apparently under development).
- Also, directly implementing a skulpt shell in the meteor page can possibly bring nice interactions.
-


i18n and L10n Demo
{{'Language' | L10n}}:
English
French
Spanish
{{'Big Number' | L10n}}:
{{bigNumber | number}}
{{'Price' | L10n}}:
{{price | currency}}
{{'Birthday' | L10n}}:
{{birthday | date}}
{{'Lunch Time' | L10n}}:
{{lunchTime | date:'h:mm a'}}


Calculate your age on other planets!
Enter Your Age:
Calculate!
Do you want to know how long you'll live?
Tell us more to find out!
Female
Male
North America
South America
Europe
Asia
Africa
Austrialia
How much time do I have?


I'M GONNA GIT YOU, SUCKA A film review by Mark R. Leeper Copyright 1989 Mark R. Leeper
[The following review uses frank language to describe the film I'M GONNA GIT YOU, SUCKA. If you feel you may be offended, you may wish not to read the review.]
Shiiiit! Hey, brother, you jiv'n me? I mean I was spectin' this to be one bad-ass film.  Like AIRPLANE! Yeah! Like, man, no way! I mean these muthah-fuckers who made this thing don't got what it takes to cut it. I mean like no-fuckin-how.
 Like, it wasn't all bad. Some of it was cool. I mean the story had wha-cha-call possibilities. I mean this dude gets out of the Army to find his brother gold-chained to death. That could happen. Shit, something like that happened to this dude I know. But then this story started messin' around with this big muther-fuckin crime lord called Mr. Big. Now you know and I know no muther-fucker is gonna go anywhere with a name like Mr. Big. Shit.
  Anyway, turns out she used to be like the main squeeze of this guy who was like Shaft, only his name was Slade. And like when Slade hears what's been goin' down he starts actin' like the bald guy in that MAGNIFICENT SOMETHING movie.    And that's cool.  No way, brother.  Shit.
Mark R. Leeper att!mtgzz!leeper<EMAIL_ADDRESS>The review above was posted to the
rec.arts.movies.reviews newsgroup (de.rec.film.kritiken for German reviews).
The Internet Movie Database accepts no responsibility for the contents of the
review and has no editorial control. Unless stated otherwise, the copyright
belongs to the author.
Please direct comments/criticisms of the review to relevant newsgroups.
Broken URLs inthe reviews are the responsibility of the author.
The formatting of the review is likely to differ from the original due
to ASCII to HTML conversion.
Related links: index of all rec.arts.movies.reviews reviews


{% extends '!footer.html' %} {% block extrafooter %}
© Copyright {{copyright}} Commonwealth Computer Research, Inc.
Licensed under the Apache License, Version 2.0
Built with Sphinx using a theme provided by Read the Docs {% if has_source and sourcename %} - view page source {% endif %}


Textbox
Two way binding using v-model
{{tb1}}
Two way binding with v-on and v-bind
{{tb2}}
CheckBox
Apple
Banana
Orange
{{item}}
Radiobox
Male
Female
{{item}}
Textarea
{{ta}}
Dropdown List
{{opt}}


Live stats
Data
Value
Total signups
Last 24 hours
Confirmed students
Confirmed staff
Domain
Active users
Domain
Unconfirmed users


Why is it important to seperate the layout and design (css) from content (html)?
HTML is the site structure and CSS is the site design. Separating CSS from html makes the code
more understandable and is very useful especially when it comes to maintain or rebuild the site
project.
What is Open Graph and how do you make use of it?
Open graph protocol enables the site to has a rich object with the same functionality
of the other object when the site is being shared on other websites like facebook or twitter.
One can do it simply by using metadata in the head section of the page code: One can specifie
the titlle, site type, image, URL, description.
What is humans.txt and how have you configure it for your site?
humans.txt is a text file located in the root of the website domain that contains information
about the people behind the website that has contributed in the website building process. It
includes also the techniques, tools and components used in the site development. It can also
includes the date of the site's last update and the site's language.
What is robots.txt and how have you configure it for your site?
It's Robots exclusion standard which is simply a text file (robots.txt) that is located in
the root of the website domain. The protocol specifies places that are not allowed to web
crawlers or the other web robots to read or to process. In the file we specifie the
"User-agent" which is the robot and we can use "*" that applies for all robots.
And "Disallow: " to define which pages the robots should not visit. In this assignment I
used "Disallow: /contact.html" to prevent the contact page of being indexed by the search
engines
Cristiano Ronaldo finally breaks Juventus duck.
Even the greatest players in the world can still get nervous.
After Cristiano Ronaldo finally broke his duck for Juventus, scoring both goals in the 2-1 win over Sassuolo,
the Portuguese superstar admitted the wait for his first had made him "anxious."
Substitute Isco rescued a point for Real Madrid as their winning start to the season came to an end against Athletic Bilbao.
Iker Muniain had put Eduardo Berizzo's Athletic ahead on 32 minutes after Real failed to clear their lines.
But, less than three minutes after coming on, Isco converted Gareth Bale's cross to earn Los Blancos a point.


Profile
(current)
Dalin's Account
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DALIN OLUOCH
Profile - My Businesses
New Business
Account Settings
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My Account
UPDATE ACCOUNT


Psychotherapy is comprised of an array of different techniques. After knowing their client's psychological problem, a good therapist will adjust the treatment to break down the person's resistance. This will help them make the changes necessary for the patients to recover. Psychotherapists use different procedures on their patients to complete the treatment.
 Several sessions are normally required for recovery. For one to benefit from this procedure, they have to open up to the doctor.
Though there's no definite time frame, about twenty sessions are necessary to deal with issues such as panic disorders, obsessions and phobias. If the process doesn't work, additional techniques such as medication and behavioral therapy may be necessary. Behavior therapy is a component of psychotherapy which involves exercises such as visualization, breathing and relaxation. Fears and phobias can be gradually faced in order to enable the client face the inhibitors.
This procedure is considered functional when one is able to wake up in the morning and function normally without any lethargic feelings. Instead of feeling insane, one feels evenly balanced, normal and happy. Feelings that were otherwise problematic can now be faced without difficulty.
There are many people who suffer from some sort of depressive disorder. This condition affects an individual's mental, physical and emotional well-being. This process has models designed to address the underlying causes of depressions and provide amicable solutions.
Symptoms of depressions are normally reinforced by thinking patterns. Many people feel depressed due to the difficulty in facing the actual reasons why they can't function normally. An individual's perception of the world affects their life experiences. Psychotherapy is used to identify thinking patterns and see how they affect a person's life. There are various processes used in this approach. Depression treatment requires short term therapy for about six months and is normally applied for individuals whose condition ranges from mild to moderate.
Cognitive-behavioral therapy is one of the processes used and which is comprised of different treatment methods. Each technique views thought processes as the trigger of emotional pain. This kind of therapy treats the symptoms by examining thought processes and substituting them with constructive thought patterns. This is a time-intensive procedure where an end point is decided by both the patient and the therapist at the beginning.
There's also interpersonal therapy which focuses on an individual's relationship with other people in his life. Here, unconscious motivations and childhood experiences are discussed to understand how a person's lifestyle influences their symptoms. This procedure utilizes several techniques within the process.
Psychodynamic therapy is an intense approach to psychotherapy. Its main focus is on psychic tensions and unconscious motivations. Here, the relationship between the patient and the therapist are very important. Symptoms are treated by helping one identify negative emotional patterns that developed in their childhood and how they influence current relationships. This technique is designed to get rid of emotional blocks which hold the symptoms in place.
Psychotherapy may not be enough for cases of severe depression. In such situations, therapy has to be combined with antidepressants. These help to stabilize an individual's emotional state to help them comprehend and apply fresh thinking habits.


--- title: "Intro to Reticulate Package - Shankar" slug: "mar2018" date: 2018-03-20 ---
Shankar covered the basics of reticulate package. The codes covered in the talk are in this location.


The Visibility Project supports public education efforts which lead to interactions, conversations, and relationships between citygoers and Seattle's homeless population.
The Visibility Project tries to approach the isolation issue from two perspective. Citygoers need additional education and encouragement to be willing to approach a homeless individual and have a conversation. Homeless individuals can display their name and needs to indicate they're willing to talk.
This is a design project created by Andrey Butenko, Ephriam Kassa, YoungJin Kim, Abby Tumbleson, and Jennifer Yan at the University of Washington for Informatics 200.


Andrew Fischer
Democrat
Teacher - Littleton Public Schools - since August 2010 Music Director - Aurora Fox Theater - since 2016 Music Director - Littleton Town Hall - since 2018
K-12: Littleton Public Schools University of Colorado at Boulder: Bachelor of Music Education (May 2010)
80107
I have not participated in any organized political activities other than being a voter. I donated $10 to the Bernie Sanders primary campaign in 2019. I have organized and participated in small, bipartisan historical/political discussion/reading groups in my community.
Since 2015 I have not participated in any organizations. All of my time and focus has been on teaching and creating opportunities for my students both in school and in the community.
Before 2015 I served on the board of the Colorado New World Music Festival in Boulder, CO for 2 years. I also spent two years serving on the board for the Colorado chapter of the American Choral Director's Association. Lastly, I served for two years as the assistant conductor of the Colorado Choir. Recently, however, all of my organization and advocation has been for students and their families in terms of school activities, career opportunities, mental health and academic success.
I have been keenly interested in political events and philosophy for many years now. When I think of the great opportunities and possibilities our political system grants us as citizens I find myself consistently distressed when I hear others lamenting how sick they are of hearing about politics, especially during election season. Participating on this commission seems like the perfect opportunity to serve my community as a citizen while addressing the unfairness that is a large part of why so many are feeling removed from the political system as a whole. I believe my abilities to empathize, be compassionate, and be understanding of varying points will be an invaluable skill set for this commission. I am excited to be part of increasing access and voice for every member of our state.
As a teacher of High School students and a music director of performers of all ages, I have spent more than a decade honing the skills required to promote consensus. Shared vision, and particularly a functional understanding of that vision, is imperative in achieving artistic and educational goals that help all involved feel successful, heard, and experience growth. Every time someone is selected for participation in a class, a show, or a performance, many others are overlooked. Fairness and impartiality are skills that have enabled me to remain professional and keep the respect of colleagues and participants. In education, fairness and impartiality are not only best practice, but legal requirements of our jobs as teachers. We may greatly admire certain students and may experience great frustration with others, but our primary objective is always equity in opportunity, assistance, and achievement. By maintaining focus on the desired outcomes, I am able to overlook emotional or personal distractions and remain confident that a path to educational goals can be found for every student. In addition, I come from an immediate family with politics on both sides of the aisle, yet we relish the chance to discuss ideas deeply and reconsider our own opinions.
Relevant analytical skills include the ability to think critically. I have learned to constructively question ideas and assertions, from myself as well as others, allowing me to make progress and innovate where many might not even see the opportunity to do so. I have learned, along with my Professional Learning Community, to asses and interpret data in such a way that it becomes directly useful for our planning and instructional strategies. My communication skills have been invaluable for working with students as well as adults. This is especially true since as artists we are consistently bringing abstract ideas to fruition, and as I mentioned above, to reach a common goal everyone involved must understand the process and desired outcomes. In terms of applying logic and reason to problem-solving, I believe creativity plays an important role since no situation or individual presents themselves the same way. Every problem offers unique challenges, and to solve unique challenges requires firm principals of fairness and objectivity as well as flexibility, creativity, and real-time problem solving skills.
Male


The operating system (OS) is the program which starts up when you turn on your computer and runs underneath all other programs - without it nothing would happen at all.
In simple terms, an operating system is a manager. It manages all the available resources on a computer, from the CPU, to memory, to hard disk accesses.
Tasks the operating system must perform:
- Control Hardware - The operating system controls all the parts of the computer and attempts to get everything working together.
- Run Applications - Another job the OS does is run application software. This would include word processors, web browsers, games, etc...
- Manage Data and Files - The OS makes it easy for you to organize your computer. Through the OS you are able to do a number of things to data, including copy, move, delete, and rename it. This makes it much easier to find and organize what you have.


|
|
CRON
|
Cron originated in the Unix environment. It is a job scheduler, allowing scripts to be run automatically at a certain time or date. The name was based on the Greek word for time, "chronos" .
The Uniform Servers portable Cron plugin has been integrated into Uniform Server Zero. Cron's configuration file has been pre-populated with various scripts to be run. These are essentially four-line templates that require enabling to run the appropriate applications from the Cron script.
The Uniform Server Zero provides a simple user control interface to start and stop Cron.
Features
- Configuration file pre-configured for common applications.
- Run Cron as a standard program
- Run scripts with the following file extensions: .bat, .vbs and .php
- Pre-configured to run DBbackup and Drupal cron jobs
Configuration file
Each script to be run requires a configuration entry in the configuration file cron.ini. Open this file in the default editor using UniController as follows:
Extra > Cron
- Each script to be run requires a configuration block. On the right three examples are shown.
- Comand-line scripts (.bat,.php and .vbs) require either an absolute or relative path (including scripts file name) to be specified.
- Note: For portability a relative path is specified. This path is relative to folder UniServerZ. e.g. \home\us_cron\test\test_cron_1.bat
- Note: Scripts with a .vbs extension are run using the Cscript.exe engine these scripts shall not use any GUI interfaces.
- Web-applications require a URL path. This URL path is what you would type into a browser to run that script.
- Each script running a Command-line or Web-application is defined in a separate block with the following format:
|
[drupal]
start = 2012-09-21 2:30:00
period = hourly
path = http://localhost/drupal/cron.php
ref =
[Test_cron_1]
start = 2012-4-1 23:35:00
period = 10
path = C:\UniServerZ\home\us_cron\test\test_cron_1.bat
ref =
[Test_cron_relative]
start = 2013-4-25 22:00:00
period = 10
path = \home\us_cron\test\test_cron_1.bat
ref =
|
Configuration block format
| [drupal] |
-- |
Each block starts with a unique name enclosed in square brackets. Note that no spaces are allowed. |
| start = |
-- |
Initial start time with the following format: Y-M-D H:M:S - Note: 24 hour clock. |
| period = |
-- |
How often to run the script from the above referenced start time Values: hourly, daily, weekly, monthly or numeric in seconds |
| path = |
-- |
a) For a web application, the full URL of the script. e.g. http://localhost/drupal/cron.php
b) Command-line (CLI) option 1: Use an absolute path with back-slashes e.g. C:\UniServer\uni_con\cron\test_cron_1.bat
c) Command-line (CLI) option 2: Use a relative path with back-slashes e.g. \home\us_cron\test_cron_1.bat |
| ref = |
-- |
A timestamp updated by cron script. Set initial value to blank |
| Note 1: |
Cron automatically updates ref. It initially adds period as set above to Start time.
For subsequent runs, it sets ref to current time + period. |
| Note 2: |
To change start time, first set a new value for start and delete the ref number, then save the file.
The script will run at the new date and time set and thereafter at the rate you defined for period. |
| Note 3: |
To use pre-configured web blocks for drupal and moodle, uncomment to enable. |
| Note 4: |
Command-line paths starting with \ followed by sub-folders bellow UniServerZ are portable.
Paths outside UniServerZ are not portable and require manually changing after relocating Uniform Server Zero. |
Cron Controller
The Uniform Server Zero provides a simple user control interface to start and stop Cron. Open this controller as follows:
Extra > Cron
|
The Cron Controller consists of two buttons and two check boxes s shown on the right
- 1) Edit configuation file button opens the configuration file in Notepad.
- 2) View log file button opens the Cron log file in Notepad.
- 3) Run Cron clicking this check box toggles between two states, checked and unchecked, which starts and stops Cron respectively.
- 4) Cron logging clicking this check box toggles between two states, checked and unchecked, which enables and disables Cron logging respectively.
Note: Initially, both Run Cron 3) and Cron logging 4) check boxes are unchecked.
|
|
Logging
Cron logs the following information:
- Time Cron was started
- Start time and path of a script that is run.
- Time Cron was stopped. Note: if this is missing from the log, it means UniController was not closed before the PC was turned off.
Note: Cron logging is disabled by default.
Additional information
Cron, run and logging are disabled by default. Instead of using the Cron controller covered above you can directely edit the server configuration file/
To enable both Cron running and logging proceed as follows:
- Open user configuration file: UniServerZ\home\us_config\us_config.ini
- Locate section [CRON] shown on right.
- Set enable_cron to true.
- Set logging to true.
|
[CRON]
; Run Cron
; true - Run Cron
; false - Disable (stop) Cron (default)
enable_cron=false
; Cron logging
; true - Enable logging
; false - no logging (default)
cron_logging=false
|
Test Scripts
Four test files have been included and pre-configured in Cron’s configuration file.
The following three scripts are simple command-line script creating a text file when run.
- UniServerZ\home\us_cron\test\test_cron_1.bat File created: UniServerZ\home\us_cron\test\test_cron_1_result.txt
- UniServerZ\home\us_cron\test\test_cron_2.vbs File created: UniServerZ\home\us_cron\test\test_cron_2_result.txt
- UniServerZ\home\us_cron\test\test_cron_3.php File created: UniServerZ\home\us_cron\test\test_cron_3_result.txt
Copy the fourth script UniServerZ\home\us_cron\test\cron_test.php to root folder UniServerZ\www File created UniServerZ\www\us_cron_test_4.txt
Summary
The above has shown how easy Cron is to use and configure.
Note: Database scheduled backups (cron) are performed using phpMyBackupPro.
|


|
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{% extends "agency_detail.html" %} {% block census-link %}
This graph reflects the race/ethnic composition of the jurisdiction at the time of the most recent survey by the Census Bureau. It is included for comparative purposes. The actual local driving population within a given jurisdiction may vary significantly from census figures.
{% comment %} Display one description for the officer statistics, and another one for the department statistics {% endcomment %} {% if officer_id %} These graphs reflect the racial composition of drivers stopped by this officer since the officer began reporting their data to the state. {% else %} These graphs reflect the racial and ethnic composition of drivers stopped by law enforcement officers in the jurisdiction since the department began reporting its data to the state. {% endif %}
Adjusting the drop down menu will display the racial breakdown of stops on a year-by-year basis. Some percentages may be based on low levels of observation. Click on the “Data” tab to review the raw stop data.
Drag the cursor over the graph to see the racial breakdown for any given year. Some percentages may be based on low levels of observation. Click the “Data” tab to review the raw stop data.
This graph displays the number of traffic stops broken down by stop purpose and ethnicity. Adjusting the drop down menu will display the individual stop counts relative to ethnic groups on a year-by-year basis.
Drag the cursor over the graph to see the racial breakdown for any given year. Some percentages may be based on low levels of observation. Click the “Data” tab to review the raw stop data.
{% comment %} Display one description for the officer statistics, and another one for the department statistics {% endcomment %} {% if officer_id %} This graph is a longitudinal representation of the officer's search rate for vehicle stops since they began reporting their data to the state. The black line represents the overall search rate for all motorists. {% else %} This graph is a longitudinal representation of the average {% if officer_id%}officer{% else %}departmental{% endif %} search rate for vehicle stops since the department began reporting its data to the state. The black line represents the overall search rate for all motorists. {% endif %}
Drag the cursor over the graph to see the racial breakdown for any given year. Some percentages may be based on low levels of observation. Click the “Data” tab to review the raw stop data.
{% comment %} Display one description for the officer statistics, and another one for the department statistics {% endcomment %} {% if officer_id %} These graphs reflect the ethnic composition of drivers searched by this officer since they began reporting their data to the state. {% else %} These graphs reflect the ethnic composition of drivers searched by law enforcement officers in the jurisdiction since the department began reporting its data to the state. {% endif %}
Adjusting the drop down menu will display the racial breakdown of searches on a year-by-year basis. Some percentages may be based on low levels of observation. Click on the “Data” tab to review the raw search data.
Drag the cursor over the graph to see the racial breakdown for any given year. Some percentages may be based on low levels of observation. Click the “Data” tab to review the raw search data.
{% comment %} Display one description for the officer statistics, and another one for the department statistics {% endcomment %} {% if officer_id %} This graph displays the likelihood of one group being searched by this officer as compared to another group for a given stop cause. Adjusting the drop down menu will display the likelihood of search occurring relative to another group on a year-by-year basis. {% else %} This graph displays the likelihood of one ethnic group being searched as compared to another group for a given stop cause. Adjusting the drop down menu will display the likelihood of search relative to another racial or ethnic group on a year-by-year basis. {% endif %}
Click the colored circles above the graph to display the comparisons between various ethnic groups. Some ratios may be based on low levels of observation. Click the “Data” tab to review the actual stop and search numbers.
This graph displays the percentage of searches that uncovered contraband for a given racial or ethnic group. Adjusting the drop down menu will display the hit rate on a year-by-year basis.
Some percentages may be based on low levels of observation. Click the “Data” tab to review the actual contraband seizure and search numbers.


If you don't have PLURA wallet yet you can get the new one at https://wallet.pluracoin.org
Please use the real PLURA wallet address. Otherwise you will not be able to mine and access generated the coins.
Adjust processor usage
Higher usage = higher income


I am Full Stack Web Developer / MEAN Stack Web Developer with more than 6 years of experience. Highly communicative person who is able to work in teams and also as a solo player. Coding in clean code, fully responsive and in pixel perfect. Highly experienced in frameworks like Bootstrap and Angular.
As i have more than 6 years of experience, i got some nice knowledge regarding Front and Back Development. Working smoothly with framework like Bootstrap. Highly experienced in work with Javascript, Angular and Node.js.
Can test quality of websites and apps. Highly experienced in Object-oriented programming, so developer with testing and debugging can be big plus for a team.
Have great knowledge on Angular and Node.js sides, so i can do full stack for application with ease. Also, working on Seller Chat Bot , chat bot for Amazon sellers that sells over messenger, so i have nice knowledge on AI side also.
 I'm using Bootstrap 3 and 4 and i also can work great with Media Queries, so raw HTML/CSS is not a problem for me. In those come also Flexbox and CSS Grid.
I think that code that is written in quality, is more than 80% of work. Every piece of code should be well nested and well commented, because as developer you will work on that code in future on adding new features to it or even refactoring it. Also code should be clean and readable for other developers as well.
I have some nice knowledge also on PSD to HTML side. I can grab PSD, Sketch or even Mockflow and make it look so slick with my skills. As i am able to work with Photoshop or Figma.
As i have passion for Web Development and i keep myself focused on learning and developing i am trying to get some contracts also over Upwork. I find myself really well organized and able to work in team or as a solo player. Had more than 20 satisfied clients.
First time that i got into AI world, a lot to process and a lot to learn. First 2 months, i spent just converting designs, mockflows and ideas into clean coded and full responsive pages. Later on, i got my opportunity in full Front End Web Development with Angular. Now, i am working openly with team as Front End. Able to create new pages and features, fix bugs and UI / UX mistakes and work well with data from back side.
So over the years, i was lucky to work on multiple great projects that require work like Angular and Node.js. I cannot share much of that work openly, as for most of the apps that i created i am bind with a Contract of Privacy. For some apps, i could share workflow of those, features and some parts of the code.
Here you can see all my main skills and also skills that I'm expert in.
Here you can see all skills that i know as bonus, that could contribute to the projects in their own way.
Here you can see some of my own simple projects:
Here you can see some of my code snippets:
Apart from being a developer, i enjoy to take long walks and small weekend trips. Most of my trips i would go to other cities and countries. I would grab my phone and take some nice pictures so those places could stay in memory. I take my trips always with couple of my friends. Together we have fun, walks, launches, deep talks and mostly, we try to enjoy and refresh for new goals.
My big passion are also video games. So when i have some time free and i did not plan any big adventure, i would grab some single player video game and follow the story that it haves to offer.
As a self taught Web Developer, i had experiencedd learning from different tutors trough this couple years. Mostly i learned from Youtube and Udemy. That gave me motivation to create my own youtube channel and pass my skills to people that are interested in Web Development.
© Stefan Omerovic


--- layout: post status: publish published: true title: Error Configuring BAS (BizTalk) with Whidbey Installed author: display_name: Tomas Restrepo login: tomasr email<EMAIL_ADDRESS>url: http://winterdom.com/ author_login: tomasr author_email<EMAIL_ADDRESS>author_url: http://winterdom.com/ wordpress_id: 682 wordpress_url: http://winterdom.com/2004/03/errorconfiguringbasbiztalkwithwhidbeyinstalled date: '2004-03-20 16:56:33 +0000' date_gmt: '2004-03-20 16:56:33 +0000' categories: - BizTalk tags: [] comments: [] ---
Just thought someone might be interested on this bit:
If you're configuring BAS on BizTalk Server 2004, and you have the Whidbey version of the .NET Framework installed, you might get an error during the configuration wizard similar to this one:
Error encountered while querying virtual server state for URL:
http:///sites/BASSite
Error Detail: Could not load type 'System.Int32' from assembly 'mscorlib,
Version=1.2.3400.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'.
To fix it, go to your BizTalk installation folder, and create a new configuration file for ConfigFramework.exe and force it run with v1.1 of the framework:
Then, run ConfigFramework.exe again and you should be able to complete the installation of BAS.


Gallery
Carousel of scenes, each one viewable by clicking/tapping a thumbnail.
Hotspots
Interactive hotspot experience, using the API to setup and travel between scenes.
Video
360° video with playback controls to play/pause and mute/unmute the video.


|
This test validates the operation of the animateTransform's additive behavior, as described in the SVG 1.1 specification (see http://www.w3.org/TR/SVG11/animate.html#AnimateTransformElement).
The first two rectangles, on the top row, show the effect of the additive attribute on animateTransform. The left-most animateTransforms have their additive attribute set to replace, so the effect of the two transform animation is as if only the highest priority one applied because it replaces the underlying value. The second animateTransforms (from left to right) have their additive attribute set to sum, which means the transforms they roduce are concatenated.
The last two rectangles, on the top row, show the effect of the accumulate attribute on animateTransform. For the left one (third on the row, from left to right), the accumulate attribute is set to none. There are two repeats for the animateTransform. Therefore, the transform goes twice from a scale(1,1) to a scale(2,2). For the right-most animateTransform, the accumulate attribute is set to sum. There are two repeats and the animation goes from scale(1,1) to scale(2,2) for the first iteration and then from scale(2,2) to scale(4,4) (because the result of the second iteration is concatenated to the scale(2,2) result of the previous, first iteration).
The rectangles on the bottom row show the combination of additive and cumulative behavior. The left rectangle's animateTransform accumulate behavior is set to none but its additive behavior is set to sum. Therefore, the transform's underlying value (skewX(30)) is always pre-concatenated to the animateTransform's result, which goes from "skewX(30) scale(1,1)" to "skewX(30) scale(2,2)" in each of its two iterations. The right rectangle's animateTransform accumulate behavior is set to sum and the additive behavior is also set to sum. Therefore, the transform's underlying value is always pre-concatenated, so is the result of previous animation iterations. Consequently, the transform goes from "skewX(30) scale(1,1)" to "skewX(30) scale(2,2)" for the first iteration and then from "skewX(30) scale(2,2) scale(1,1)" to "skewX(30) scale(2,2) scale(2,2)" for the second iteration.


---
page:
body_class: 'orgs-list fill-content'
bindings:
- name: 'teamLeads'
resource: '/api/users'
params:
limit: false
sort: name
fields: firstName,lastName,username,schoolOrg,created,teamLeadType,roles
q: "roles/contains:lead|admin"
- name: stations
resource: '/api/restoration-stations'
params:
limit: false
noexpand: teamLead
fields: status,schoolOrg,site,teamLead
---
{{ $teamLeads := $.bindings.teamLeads }}
{{ $sites := $.bindings.sites }}
{{ $stations := $.bindings.stations }}
{{ $orgs := $.bindings.orgs }}
People
{{ if $.flags.admin }}
| Edit |
{{ end }}
First Name |
Last Name |
Username |
User Type |
ORS Site(s) |
Org Name |
Org Borough/City |
Org Neighborhood |
Joined On |
{{ range $i, $teamLead := $teamLeads }}
{{ $teamLeadStations := filterByKey $stations "teamLead._id" $teamLead._id }}
{{ $teamLeadSites := join (uniq (pluck $teamLeadStations "site.name") ) ", "}}
{{ if $.flags.admin }}
|
|
{{ end }}
{{ $teamLead.firstName }}
|
{{ $teamLead.lastName }}
|
{{ $teamLead.username }}
|
{{ if $teamLead.teamLeadType }}
{{ $teamLead.teamLeadType }} |
{{ else }}
|
{{ end }}
{{ $teamLeadSites }}
|
{{ $teamLead.schoolOrg.name }}
|
{{ if $teamLead.schoolOrg.city }}
{{ $teamLead.schoolOrg.city }}
{{ end }}
|
{{ if $teamLead.schoolOrg.neighborhood }}
{{ $teamLead.schoolOrg.neighborhood }}
{{ end }}
|
{{ time $teamLead.created "slash" }}
|
{{ end }}


The Liberal Party of Australia:
Reconsider your plan for a 'fibre to the node' broadband network in favour of a superior 'fibre to the home' network.
Australia needs the
right
National Broadband Network.
Sign the petition at
change.org
!
Tweet


Amazon EMR Cluster KerberosAttributes
The
KerberosAttributes
property type specifies attributes for Kerberos configuration when Kerberos authentication
is enabled using a security configuration.
KerberosAttributes
is a property of the AWS::EMR::Cluster resource.
Syntax
To declare this entity in your AWS CloudFormation template, use the following syntax:
JSON
{ "ADDomainJoinPassword" :
String
, "ADDomainJoinUser" :String
, "CrossRealmTrustPrincipalPassword" :String
, "KdcAdminPassword" :String
, "Realm" :String
}
YAML
ADDomainJoinPassword:
String
ADDomainJoinUser:String
CrossRealmTrustPrincipalPassword:String
KdcAdminPassword:String
Realm:String
Properties
ADDomainJoinPassword
-
The Active Directory password for
ADDomainJoinUser
.Length Constraints: Minimum length of 0. Maximum length of 256.
Pattern: [\u0020-\uD7FF\uE000-\uFFFD\uD800\uDC00-\uDBFF\uDFFF\r\n\t]*
Required: No
Type: String
Update requires: No interruption
ADDomainJoinUser
-
Required only when establishing a cross-realm trust with an Active Directory domain. A user with sufficient privileges to join resources to the domain.
Length Constraints: Minimum length of 0. Maximum length of 256.
Pattern: [\u0020-\uD7FF\uE000-\uFFFD\uD800\uDC00-\uDBFF\uDFFF\r\n\t]*
Required: No
Type: String
Update requires: No interruption
CrossRealmTrustPrincipalPassword
-
Required only when establishing a cross-realm trust with a KDC in a different realm. The cross-realm principal password, which must be identical across realms.
Length Constraints: Minimum length of 0. Maximum length of 256.
Pattern: [\u0020-\uD7FF\uE000-\uFFFD\uD800\uDC00-\uDBFF\uDFFF\r\n\t]*
Required: No
Type: String
Update requires: No interruption
KdcAdminPassword
-
The password used within the cluster for the kadmin service on the cluster-dedicated KDC, which maintains Kerberos principals, password policies, and keytabs for the cluster.
Length Constraints: Minimum length of 0. Maximum length of 256.
Pattern: [\u0020-\uD7FF\uE000-\uFFFD\uD800\uDC00-\uDBFF\uDFFF\r\n\t]*
Required: Yes
Type: String
Update requires: No interruption
Realm
-
The name of the Kerberos realm to which all nodes in a cluster belong. For example,
EC2.INTERNAL
.Length Constraints: Minimum length of 0. Maximum length of 256.
Pattern: [\u0020-\uD7FF\uE000-\uFFFD\uD800\uDC00-\uDBFF\uDFFF\r\n\t]*
Required: Yes
Type: String
Update requires: No interruption
See Also
-
KerberosAttributes in the Amazon EMR API Reference
-
Use Kerberos Authentication in the Amazon EMR Management Guide


| Package | Description |
|---|---|
| com.hcl.domino | |
| com.hcl.domino.data | |
| com.hcl.domino.dxl |
| Modifier and Type | Method and Description |
|---|---|
IDTable |
DominoClient.createIDTable()
Creates a new, empty ID table.
|
| Modifier and Type | Interface and Description |
|---|---|
interface |
DocumentSelection
Subclass of
IDTable to select data, design or admin documents from an NSF. |
| Modifier and Type | Method and Description |
|---|---|
IDTable |
DominoCollection.getAllIdsAsIDTable(boolean checkRights) |
IDTable |
Database.getAllNoteIds(Set<DocumentClass> docClasses,
boolean includeDeletions)
This function returns an
IDTable of all note IDs in the database
with the given set of DocumentClass .If includeDeletions is set to TRUE, the returned IDTable
also contains the note IDs of deleted documents. |
IDTable |
Database.getIDTableForFolder(int folderNoteId,
boolean validateIds)
This function gets the Note IDs of notes in a folder and returns a IDTable.
|
IDTable |
Database.getIDTableForFolder(String folderName,
boolean validateIds)
This function gets the Note IDs of notes in a folder and returns a IDTable.
|
IDTable |
Database.getModifiedNoteIds(Set<DocumentClass> docClasses,
TemporalAccessor since,
boolean includeDeletions)
This function returns an
IDTable of Note IDs of documents which have been modified in some way
from the given starting time until "now".The ending date/time is returned in getDateTime() , so that this
function can be performed incrementally.The returned IDTable also contains the note IDs of deleted documents. |
IDTable |
Document.getResponses()
Retrieves the response documents to this document.
|
IDTable |
IDTable.intersect(Collection<Integer> noteIds)
This function creates the intersection of two ID sets.
The resulting table contains those IDs that are common to both source tables. |
| Modifier and Type | Method and Description |
|---|---|
abstract Optional<IDTable> |
DQLQueryResult.getNoteIds() |
Optional<IDTable> |
FormulaQueryResult.getNoteIds() |
Optional<IDTable> |
FTQueryResult.getNoteIds()
Returns an
IDTable of documents matching the search. |
Optional<IDTable> |
DbQueryResult.getNoteIds()
Returns an
IDTable of documents matching the search. |
Optional<IDTable> |
DocumentSelection.getPreselection()
Returns an
IDTable with note ids to pre-filter the documents to
be scanned by the search |
Optional<IDTable> |
Database.getUnreadDocumentTable(String userName,
boolean createIfNotAvailable,
boolean updateUnread)
An ID Table is created containing the list of unread documents in the
database for the specified user.
The argument createIfNotAvailable controls what action is to be performed
if there is no list of unread notes for the specified user in the database.If no list is found and this flag is set to false , the method will return null .if this flag is set to {code true}, the list of unread documents will be created and all documents in the database will be added to the list. No coordination is performed between different users of the same database. If an application obtains a list of unread documents while another user is modifying the list, the changes made may not be visible to the application. Unread marks for each user are stored in the client desktop.dsk file and in the database. When a user closes a database (either through the Notes user interface or through an API program), the unread marks in the desktop.dsk file and in the database are synchronized so that they match. Unread marks are not replicated when a database is replicated. Instead, when a user opens a replica of a database, the unread marks from the desktop.dsk file propagates to the replica database. |
| Modifier and Type | Method and Description |
|---|---|
FormulaQueryResult |
Database.queryFormula(String selectionFormula,
IDTable filter,
Set<DirectorySearchQuery.SearchFlag> searchFlags,
TemporalAccessor since,
Set<DocumentClass> docClass)
Evaluates a formula on a set of documents or the whole database
|
| Modifier and Type | Method and Description |
|---|---|
Optional<IDTable> |
DxlImporter.getImportedNoteIds() |
Copyright © 2019–2021 HCL. All rights reserved.


This feature is an alternative way for displaying master/detail data when the detail data source stores filenames for external images (for example, the master table stores information about photo albums while the detail table stores information about album photos).  You can also select number of images to be previewed in the View form.
Click any album title or album cover to display the photos of that album. Note that you can also upload multiple images at a time.


So given the constraints of my research budget, I did not (nor expect to have) $250,000+ to buy a new HPC cluster. While Cloud Computing is also exciting, and I’ll probably discuss some musings on that in a separate post, there’s a lot of unknown costs that make it hard for me to predict. One of the biggest challenges, is that my “base” data set is approximately 20 Terabytes. When I first started looking into this 4-5 years ago, storing that amount of data was prohibitively expensive. Even now, it’s not cheap…
So I started off small, with a 16 core server with some hard drives. I used Sun Grid Engine (and now torque) to handle job execution, and have stuck with Ubuntu as my primary OS.
My first “BIG” purchase after this was a Storage NAS. I have been using QNAP devices for almost ten years, and have been a big fan. I like having at least some of my primary storage as an “appliance” . On multiple occasions I have fried my primary system during upgrades, installing software/etc.. and by having at least some of my files living in a stable spot (aka QNAP), I’ve saved myself a lot of frustration.
Once the NAS was up and running, I purchased my first batch of servers. After spending a LOT of time searching around, I made a couple of executive decisions. While my head node and NAS were purchased new, for my compute cluster I basically wanted max # of CPU’s and memory for the least amount of money. One great option, particularly for a cash-strapped lab can do some of it’s own maintenance and doesn’t need to be truly production is to look into refurbished servers.
My first batch of servers included 10 HPG6 DL160 servers. I was able to purchase each machine for about $800.
HP ProLiant DL160 G6 1U 2x XEON HEX-CORE X5650 2.66GHz with 72GB DDR3. Each machine only had an 160GB drive for the primary OS, but that’s OK because everything was connected to my NAS which is where all the files lived. This was setup just using standard 1GB connectivity, and basically was able to rack all the machines fairly quickly…
Purchasing a similarly specced machine new would have cost me around $4000-$5000 each. The only downside, is that I don’t have any warranty (other than the 90 days from the vendor). However unless I have incredibly poor luck, if any of the machines wound up dying I’d still be WAY ahead. Also these aren’t the absolutely latest generation, but for bulk parallel computation, it doesn’t matter. Also the marginal improvement from generation to generation is not a factor of 10… it’s usually several percent increases.
So basically, for an $8000 investment, I now purchased 120 cores (240 threads) of computing, and 720GB of RAM (72GB / server is quite nice).
So now I just have a lot of “stuff”…. I need to actually get them provisioned/configured…. That’s in the next post…


Java Unleashed Second Edition
Chapter 10
Exception Handling
by David R. Chung
CONTENTS
- What Is an Exception?
- If Exceptions Are the Answer, What Is the Question?
- Some Terminology
- Don't Throw Up Your Hands-throw an Exception
- throw, try, and catch Blocks
- The Throwable Class
- Types of Exceptions
- Built-In Exceptions
- Summary
Errors are a normal part of programming. Some of these errors are flaws in a program's basic design or implementation-these are called bugs. Other types of errors are not really bugs; rather, they are the result of situations like low memory or invalid filenames.
The way you handle the second type of error determines whether they become bugs. Unfortunately, if your goal is to produce robust applications, you probably find yourself spending more time handling errors than actually writing the core of your application.

What Is an Exception?
As the name implies, an exception is an exceptional condition. An exception is something that is out of the ordinary. Most often, exceptions are used as a way to report error conditions. Exceptions can be used as a means of indicating other situations as well. This chapter concentrates primarily on exceptions as an error handling mechanism.
Exceptions provide notification of errors and a way to handle
them. This new control structure allows you to specify exactly
where to handle specific types of errors.
| Note |
Other languages such as C++ and Ada provide exception handling. Java's exception handling is similar to the one used by C++. |
Tennyson Understood the Problem
In his poem, Charge of the Light Brigade, Alfred, Lord Tennyson describes an actual battle. In this battle, a cavalry brigade is ordered to attack a gun emplacement. It turns out that the valley the troops attack is a trap.  The poem describes an actual battle from the Crimean War.
The battle as Tennyson describes it highlights a classic problem. Someone (probably far from the front) had given the order to attack. The men who led the charge very quickly became aware that an error had been made. Unfortunately, they did not have the authority to do anything about it. In Tennyson's immortal words, "Theirs not to reason why, theirs but to do and die: into the valley of Death rode the 600."
Using exceptions in Java allows you to determine exactly who handles an error. In fact, low-level functions can detect errors while higher-level functions decide what to do about them. Exceptions provide a means of communicating information about errors up through the chain of methods until one of them can handle it.
If Exceptions Are the Answer, What Is the Question?
Most procedural languages like C and Pascal do not use exception handling. In these languages, a variety of techniques are used to determine whether an error has occurred. The most common means of error checking is the function's return value.
Consider the problem of calculating the retail cost of an item and displaying it. For this example, the retail cost is twice the wholesale cost:
int retailCost( int wholesale ) { if ( wholesale <= 0 ) { return 0 ; } return (wholesale * 2 ) ; }
The retailCost() method takes the wholesale price of an item and doubles it. If the wholesale price is negative or zero, the function returns zero to indicate that an error has occurred. This method can be used in an application as follows:
int wholesalePrice = 30 ; int retailPrice = 0 ; retailPrice = retailCost( wholesalePrice ) ; System.out.println( "Wholesale price = " + wholesalePrice ) ; System.out.println( "Retail price = " + retailPrice ) ;
In this example, the retailCost() method calculates the correct retail cost and prints it. The problem is that the code segment never checks whether the wholesalePrice variable is negative. Even though the method checks the value of wholesalePrice and reports an error-there is nothing that forces the calling method to deal with the error. If this method is called with a negative wholesalePrice, the function blindly prints invalid data. Therefore, no matter how diligent you are in ensuring that your methods return error values, the callers of your methods are free to ignore them.
You can prevent bad values from being printed by putting the whole operation in a method. The showRetail() method takes the wholesale price, doubles it, and prints it. If the wholesale price is negative or zero, the method does not print anything and returns the boolean value false:
boolean showRetail( int wholesale ) { if ( wholesale <= 0 ) { return false ; } int retailPrice ; retailPrice = wholesalePrice * 2 ; System.out.println( "Wholesale price = " + wholesale ) ; System.out.println( "Retail price = " + retailPrice ) ; return true ; }
Using this new and improved method guarantees that bad values are never printed. However, once again, the caller does not have to check to see whether the method returned true.
The fact that the caller can choose to ignore return values is not the only problem with using return values to report errors. What happens if your method returns a boolean and both true and false are valid return values? How does this method report an error?
Consider a method to determine whether a student passes a test. The pass() method takes the number of correct answers and the number of questions. The method calculates the percentage; if it is greater than 70 percent, the student passes. Consider the passingGrade() method:
boolean passingGrade( int correct, int total ) { boolean returnCode = false ; if ( (float)correct / (float)total > 0.70 ) { returnCode = true ; } return returnCode ; }
In this example, everything works fine as long as the method arguments are well behaved. What happens if the number correct is greater than the total? Or worse, if the total is zero (because this causes a division by zero in the method)? By relying on return values in this case, there is no way to report an error in this function.
Exceptions prevent you from making your return values do double duty. Exceptions allow you to use return values to return only useful information from your methods. Exceptions also force the caller to deal with errors-because exceptions cannot be ignored.
Some Terminology
Exception handling can be viewed as a nonlocal control structure. When a method throws an exception, its caller must determine whether it can catch the exception. If the calling method can catch the exception, it takes over and execution continues in the caller. If the calling method cannot catch the exception, the exception is passed on to its caller. This process continues until either the exception is caught or the top (or bottom, depending on how you look at it) of the call stack is reached and the application terminates because the exception has not been caught.
Java exceptions are class objects subclassed from java.lang.Throwable. Because exceptions are class objects, they can contain both data and methods. In fact, the base class Throwable implements a method that returns a String describing the error that caused the exception. This is useful for debugging and for giving users a meaningful error message.
Don't Throw Up Your Hands-throw an Exception
The passingGrade() method presented in the preceding section was unable to report an error condition because all its possible return values were valid. Adding exception handling to the method makes it possible to uncouple the reporting of results from the reporting of errors.
The first step is to modify the passingGrade() method definition to include the throws clause. The throws clause lists the types of exceptions that can be thrown by the method. In the following revised code, the method throws only an exception of type Exception:
static boolean passingGrade( int correct, int total ) throws Exception { boolean returnCode = false ;
The rest of the method remains largely unchanged. This time, the method checks to see whether its arguments make sense. Because this method determines passing grades, it would be un-reasonable to have more correct responses than total responses. Therefore, if there are more correct responses than total responses, the method throws an exception.
The method instantiates an object of type Exception. The Exception constructor takes a String parameter. The String contains a message that can be retrieved when the exception is caught. The throw statement terminates the method and gives its caller the opportunity to catch it:
if( correct > total ) { throw new Exception( "Invalid values" ) ; } if ( (float)correct / (float)total > 0.70 ) { returnCode = true ; } return returnCode ; }
throw, try, and catch Blocks
To respond to an exception, the call to the method that produces it must be placed within a try block. A try block is a block of code beginning with the try keyword followed by a left and a right curly brace. Every try block is associated with one or more catch blocks. Here is a try block:
try { // method calls go here }
If a method is to catch exceptions thrown by the methods it calls, the calls must be placed within a try block. If an exception is thrown, it is handled in a catch block. Different catch blocks handle different types of exceptions. This is a try block and a catch block set up to handle exceptions of type Exception:
try { // method calls go here } catch( Exception e ) { // handle exceptons here }
When any method in the try block throws any type of exception, execution of the try block ceases. Program control passes immediately to the associated catch block. If the catch block can handle the given exception type, it takes over. If it cannot handle the exception, the exception is passed to the method's caller. In an application, this process goes on until a catch block catches the exception or the exception reaches the main() method uncaught and causes the application to terminate.
An Exceptional Example
Because all Java methods are class members, the passingGrade() method is incorporated in the gradeTest application class. Because main() calls passingGrade(), main() must be able to catch any exceptions passingGrade() might throw. To do this, main() places the call to passingGrade() in a try block. Because the throws clause lists type Exception, the catch block catches the Exception class. Listing 10.1 shows the entire gradeTest application.
Listing 10.1. The gradeTest
application.
import java.io.* ; import java.lang.Exception ; public class gradeTest { public static void main( String[] args ) { try { // the second call to passingGrade throws // an excption so the third call never // gets executed System.out.println( passingGrade( 60, 80 ) ) ; System.out.println( passingGrade( 75, 0 ) ) ; System.out.println( passingGrade( 90, 100 ) ) ; } catch( Exception e ) { System.out.println( "Caught exception --" + e.getMessage() ) ; } } static boolean passingGrade( int correct, int total ) throws Exception { boolean returnCode = false ; if( correct > total ) { throw new Exception( "Invalid values" ) ; } if ( (float)correct / (float)total > 0.70 ) { returnCode = true ; } return returnCode ; } }
The second call to passingGrade() fails in this case, because the method checks to see whether the number of correct responses is less than the total responses. When passingGrade() throws the exception, control passes to the main() method. In this example, the catch block in main() catches the exception and prints Caught exception -- Invalid values.
Multiple catch Blocks
In some cases, a method may have to catch different types of exceptions. Java supports multiple catch blocks. Each catch block must specify a different type of exception:
try { // method calls go here } catch( SomeExceptionClass e ) { // handle SomeExceptionClass exceptions here } catch( SomeOtherExceptionClass e ) { // handle SomeOtherExceptionClass exceptions here }
When an exception is thrown in the try block, it is caught by the first catch block of the appropriate type. Only one catch block in a given set will be executed. Notice that the catch block looks a lot like a method declaration. The exception caught in a catch block is a local reference to the actual exception object. You can use this exception object to help determine what caused the exception to be thrown in the first place.
Does Every Method Have to Catch Every Exception?
What happens if a method calls another method that throws an exception but chooses not to catch it? In the example in Listing 10.2, main() calls foo(), which in turn calls bar(). bar() lists Exception in its throws clause; because foo() is not going to catch the exception, it must also have Exception in its throws clause. The application in Listing 10.2 shows a method, foo(), that ignores exceptions thrown by the called method.
Listing 10.2. A method that ignores exceptions thrown by the
method it calls.
import java.io.* ; import java.lang.Exception ; public class MultiThrow { public static void main( String[] args ) { try { foo() ; } catch( Exception e ) { System.out.println( "Caught exception " + e.getMessage() ) ; } } static void foo() throws Exception { bar() ; } static void bar() throws Exception { throw new Exception( "Who cares" ) ; } }
In the example in Listing 10.3, main() calls foo() which calls bar(). Because bar() throws an exception and doesn't catch it, foo() has the opportunity to catch it. The foo() method has no catch block, so it cannot catch the exception. In this case, the exception propagates up the call stack to foo()'s caller, main().
Listing 10.3. A method that catches and rethrows an exception.
import java.io.* ; import java.lang.Exception ; public class MultiThrow { public static void main( String[] args ) { try { foo() ; } catch( Exception e ) { System.out.println( "Caught exception " + e.getMessage() ) ; } } static void foo() throws Exception { try { bar() ; } catch( Exception e ) { System.out.println( "Re throw exception -- " + e.getMessage() ) ; throw e ; } } static void bar() throws Exception { throw new Exception( "Who cares" ) ; } }
The foo() method calls bar(). The bar() method throws an exception and foo() catches it. In this example, foo() simply rethrows the exception, which is ultimately caught in the application's main() method. In a real application, foo() could do some processing and then rethrow the exception. This arrangement allows both foo() and main() to handle the exception.
The finally Clause
Java introduces a new concept in exception handling: the finally clause. The finally clause sets apart a block of code that is always executed. Here's an example of a finally clause:
import java.io.* ; import java.lang.Exception ; public class MultiThrow { public static void main( String[] args ) { try { alpha() ; } catch( Exception e } { System.out.println( "Caught exception " ) ; } finally() { System.out.println( "Finally. " ) ; } } }
In normal execution (that is, when no exceptions are thrown), the finally block is executed immediately after the try block. When an exception is thrown, the finally block is executed before control passes to the caller.
If alpha() throws an exception, it is caught in the catch block and then the finally block is executed. If alpha() does not throw an exception, the finally block is executed after the try block. If any code in a try block is executed, the finally block is executed as well.
The Throwable Class
All exceptions in Java are subclassed from the class Throwable. If you want to create your own exception classes, you must subclass Throwable. Most Java programs do not have to subclass their own exception classes.
Following is the public portion of the class definition of Throwable:
public class Throwable { public Throwable() ; public Throwable(String message) ; public String getMessage() public String toString() ; public void printStackTrace() ; public void printStackTrace(java.io.PrintStream s) ; private native void printStackTrace0(java.io.PrintStream s); public native Throwable fillInStackTrace(); }
The constructor takes a string that describes the exception. Later, when an exception is thrown, you can call the getMessage() method to get the error string that was reported.
Types of Exceptions
The methods of the Java API and the language itself also throw exceptions. These exceptions can be broken into two classes: Exception and Error.
Both the Exception and Error classes are derived from Throwable. Exception and its subclasses are used to indicate conditions that may be recoverable. Error and its subclasses indicate conditions that are generally not recoverable and should cause your applet to terminate.
The various packages included in the Java Developers Kit throw different kinds of Exception and Error exceptions, as described in the following sections.
java.lang Exceptions
The java.lang package contains much of the core Java language. The exceptions subclassed from RuntimeException do not have to be declared in a method's throws clause. These exceptions are considered normal and nearly any method can throw them. Figure 10.1 and Table 10.1 show the recoverable exceptions from the java.lang package. Figure 10.2 and Table 10.2 show the nonrecoverable errors in the java.lang package.
Figure 10.1: The Java.lang exception hierarchy.
Figure 10.2: The Java.lang error hierarchy.
| Exception | Cause |
| ArithmeticException | Arithmetic error condition (for example, divide by zero). |
| ArrayIndexOutOfBoundsException | Array index is less than zero or greater than the actual size of the array. |
| ArrayStoreException | Object type mismatch between the array and the object to be stored in the array. |
| ClassCastException | Cast of object to inappropriate type. |
| ClassNotFoundException | Unable to load the requested class. |
| CloneNotSupportedException | Object does not implement the cloneable interface. |
| Exception | Root class of the exception hierarchy. |
| IllegalAccessException | Class is not accessible. |
| IllegalArgumentException | Method receives an illegal argument. |
| IllegalMonitorStateException | Improper monitor state (thread synchronization). |
| IllegalThreadStateException | The thread is in an improper state for the requested operation. |
| IndexOutOfBoundsException | Index is out of bounds. |
| InstantiationException | Attempt to create an instance of the abstract class. |
| InterruptedException | Thread interrupted. |
| NegativeArraySizeException | Array size is less than zero. |
| NoSuchMethodException | Unable to resolve method. |
| NullPointerException | Attempt to access a null object member. |
| NumberFormatException | Unable to convert the string to a number. |
| RuntimeException | Base class for many java.lang exceptions. |
| SecurityException | Security settings do not allow the operation. |
| StringIndexOutOfBoundsException | Index is negative or greater than the size of the string. |
| Error | Cause |
| AbstractMethodError | Attempt to call an abstract method. |
| ClassCircularityError | This error is no longer used. |
| ClassFormatError | Invalid binary class format. |
| Error | Root class of the error hierarchy. |
| IllegalAccessError | Attempt to access an inaccessible object. |
| IncompatibleClassChangeError | Improper use of a class. |
| InstantiationError | Attempt to instantiate an abstract class. |
| InternalError | Error in the interpreter. |
| LinkageError | Error in class dependencies. |
| NoClassDefFoundError | Unable to find the class definition. |
| NoSuchFieldError | Unable to find the requested field. |
| NoSuchMethodError | Unable to find the requested method. |
| OutOfMemoryError | Out of memory. |
| StackOverflowError | Stack overflow. |
| ThreadDeath | Indicates that the thread will terminate. May be caught to perform cleanup. (If caught, must be rethrown.) |
| UnknownError | Unknown virtual machine error. |
| UnsatisfiedLinkError | Unresolved links in the loaded class. |
| VerifyError | Unable to verify bytecode. |
| VirtualMachineError | Root class for virtual machine errors. |
java.io Exceptions
The classes in java.io throw a variety of exceptions, as shown in Table 10.3 and Figure 10.3. Any classes that work with I/O are good candidates to throw recoverable exceptions. For example, activities such as opening files or writing to files are likely to fail from time to time. The classes of the java.io package do not throw errors at all.
Figure 10.3: The Java.io exception hierarchy.
| Exception | Cause |
| IOException | Root class for I/O exceptions. |
| EOFException | End of file. |
| FileNotFoundException | Unable to locate the file. |
| InterruptedIOException | I/O operation was interrupted. Contains a bytesTransferred member that indicates how many bytes were transferred before the operation was interrupted. |
| UTFDataFormatException | Malformed UTF-8 string. |
java.net Exceptions
The java.net package handles network communications. Its classes most often throw exceptions to indicate connect failures and the like. Table 10.4 and Figure 10.4 show the recoverable exceptions from the java.net package. The classes of the java.net package do not throw errors at all.
Figure 10.4: The Java.net exception hirearchy.
| Exception | Cause |
| MalformedURLException | Unable to interpret URL. |
| ProtocolException | Socket class protocol error. |
| SocketException | Socket class exception. |
| UnknownHostException | Unable to resolve the host name. |
| UnknownServiceException | Connection does not support the service. |
java.awt Exceptions
The AWT classes have members that throw one error and one exception:
- AWTException (exception in AWT)
- AWTError (error in AWT)
java.util Exceptions
The classes of java.util throw the following exceptions:
- EmptyStackException (no objects on stack)
- NoSuchElementException (no more objects in collection)
Built-In Exceptions
In the example in Listing 10.4, you see how the automatic exceptions in Java work. This application creates a method and forces it to divide by zero. The method does not have to explicitly throw an exception because the division operator throws an exception when required.
Listing 10.4. An example of a built-in exception.
import java.io.* ; import java.lang.Exception ; public class DivideBy0 { public static void main( String[] args ) { int a = 2 ; int b = 3 ; int c = 5 ; int d = 0 ; int e = 1 ; int f = 3 ; try { System.out.println( a+"/"+b+" = "+div( a, b ) ) ; System.out.println( c+"/"+d+" = "+div( c, d ) ) ; System.out.println( e+"/"+f+" = "+div( e, f ) ) ; } catch( Exception except ) { System.out.println( "Caught exception " + except.getMessage() ) ; } } static int div( int a, int b ) { return (a/b) ; } } The output of this application is shown here: 2/3 = 0 Caught exception / by zero
The first call to div() works fine. The second call fails because of the divide-by-zero error. Even though the application did not specify it, an exception was thrown-and caught. So you can use arithmetic in your code without writing code that explicitly checks bounds.
Summary
The exception handling mechanism in Java allows your methods to report errors in a manner that cannot be ignored. Every exception that is thrown must be caught or the application terminates. Exceptions are actually class objects derived from the Throwable class. Therefore, exceptions combine data and methods; an exception object generally contains a string explaining what the error is.
Exception handling helps you combine error processing in one place. It uncouples the reporting of results and the reporting of errors. If you use exception handling, you can create much more powerful and robust code.


Click on one of the links above for a description of that project. Please be patient as images and videos load on this page.
Built with a custom Python engine (only using external libraries tkinter for graphics and pygame for music) and markup language, this game tells the story of two individuals who are traveling to a sinkhole that threatens to consume their planet. Travel between towns, collect items, and solve puzzles to keep the plot moving.
This game was made for a UVA game design course and built with a homemade TypeScript game engine which targets HTML5 canvas. Two players control a red and a blue character on a horizontally split screen; the characters have special interactions with objects of their color. To progress through the level, players need to switch places with each other: communication is key!
One of the first games I worked on! I developed much of the code within MonoGame for a top-down RPG that's set in a high school; the end product is still a prototype, but some parts, such as the in-game menu UI, were thoughtfully implemented. Talk to NPCs with branching dialogue, perform quests to infiltrate cliques, pickpocket items from other students, and even fight a boss!
Made for the UVA computer science capstone, this project (developed by a team of 6) supports PauseLab's participatory budgeting efforts by providing a centralized place for ideas and project proposals related to community development, mass-mail, news posts, and votes. The website was constructed with Ruby on Rails 5 (with Bootstrap 4 and some Coffeescript on the front-end).
As the Student Game Developers' webmaster, I converted our website from a large set of static HTML pages to a dynamically generated collection on the LAMP stack. With the addition of a SQL DB and PHP templates, adding new content is as simple as inserting new rows. NOTE: The front-end design (which originates from a Bootstrap 3 theme) was done by my predecessor.
As the Student Game Developers' vice president, I created a wiki to document our senior members' knowledge on tools and workflows for our future members' benefit. Content is written in Markdown (a simple format) and is automatically converted to HTML (with the help of Pandoc and TravisCI) to render nicely on GitHub Pages.
Made for a UVA deep learning graphics course, this project adapts a neural style algorithm to create a visualizer that fluctuates between two styles based on the frequency content of the music that is playing.
Made for the UVA computer engineering capstone, this system (created by a team of 5) allows humans to play over-the-board chess against computers. The system is composed of a Reed switch circuit to detect human piece movements, a connection to a Stockfish chess engine to devise responses, and a motor-driven actuating magnet to execute those responses.
Made for a UVA machine vision course, this project uses LabVIEW and NI image processing libraries to allow a webcam to observe a chess game and automatically generate a log of moves made. To keep piece recognition robust, we use custom cut pieces that are easily distinguishable from overhead.
Made for a UVA embedded systems course, this project is modeled after the cyclone redemption game found in many arcades. It targets the Texas Instruments MSP430 microcontroller, and uses three different header boards: flash memory, 7-segment display and rotary encoder, and circular array of LEDs.
Made for a UVA signals and systems course, this project uses a printed circuit board to read electrical signals from one's heart and send them to the NI MyRIO for digital processing.


{{/* Copyright 2018 Google Inc. All rights reserved. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. */}}
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Scott Frost Not Happy With Nebraska’s ‘Leadership’ This Season
by Matt HladikNebraska’s potential breakout season never materialized. The Huskers are 4-6 on the year and need to win their final two games to reach a bowl.
There have been several reasons for Nebraska’s struggles. Today, head coach Scott Frost took aim at his team’s leadership, or lack thereof.
While meeting with the media this afternoon, Frost made some pointed remarks about leadership not being “where we needed it to be” because a few people (presumably players) are “working against that.”
Well, this isn’t what you want your head coach to be talking about with two weeks left in the season. Frost has a lot of issues in his program that he needs to iron out.
He should have plenty of time to do that. Over the weekend, Frost signed a two-year contract extension, locking him in in Lincoln through December 31, 2026.
Nebraska will travel to Maryland this weekend. The Huskers need to beat the Terps, then beat Iowa in the regular season finale to qualify for a bowl game.
Nebraska has finished 4-8 each of the last two seasons and has not reached a bowl since 2016.


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Measure round-trip latency as a function of message size, by sending and receiving (echoing) messages of size 1, 64, and 1024 bytes, using both TCP and UDP. Measure RTTs.
Measure throughput by sending TCP messages of size 1K, 16K, 64K, 256K, and 1M bytes in each direction. Measure transfer rates.
Measure the interaction between message size and number of messages using TCP and UDP using different numbers of messages: 256 x 4KByte messages, 512 x 2KByte messages, and 1024 x 1KByte messages.
This project was built utilizing the Kotlin programming language, and was ran accross platforms and networks. It utilizes the Java IO and Network library to connect and transfer data between two machines. To measure the time, the program uses System.nanoTime to record transfer times.
Measure of the transer using the stop-and-wait protocol. Options for ipv4 and ipv6 addresses available, as well as simulated drops.
Measure of the transfer using the sliding-window protocol. Options for the ipv4 and ipv6 addresses available, as well as simulated drops.


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