Archive for the ‘Java Platform’ Category
Posted by jpluimers on 2024/05/15
According to @isotopp (Kristian Köhntopp ), this is one of the most important talks to watch regarding performance issues: [Wayback/Archive.is] How NOT to Measure Latency
Gil Tene provides an in-depth overview of Latency and Response Time Characterization, including proven methodologies for measuring, reporting, and investigating latencies, and overview of some common pitfalls encountered (far too often) in the field. Tene also covers specific considerations in garbage collected environments (such as Java).
It is on YouTube (embedded below the signature) as well, but the above link as synchronised slides plus video.
More places where you can get it:
Via [Archive.is] Kristian Köhntopp on Twitter: “… Dieser Talk ist einer der wichtigsten Talks überhaupt, wenn es um das debuggen von “Performance Problemen” oder SLOs geht.”
–jeroen
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Posted in .NET, Database Development, Development, Java, Java Platform, Profiling-Performance-Measurement, Software Development | Leave a Comment »
Posted by jpluimers on 2024/04/18
The final visualisation post of this week (themed Data Visualisation and Code Visualisation) is about [Wayback/Archive] Python Tutor – Visualize Python, Java, C, C++, JavaScript, TypeScript, and Ruby code execution.
Languages covered in these visualisers:
Earlier posts in the series:
–jeroen
Posted in C, C++, Development, Java, Java Platform, JavaScript/ECMAScript, Python, Ruby, Scripting, Software Development | Leave a Comment »
Posted by jpluimers on 2024/03/30
[Wayback/Archive] FemFM – 〝50% vrouw in je oor, of we zappen door!〞 werd in 2024 gelanceerd vlak voor de Women’s History Month en Internationale Vrouwendag door Felienne Hermans.
Felienne is bekend van bijvoorbeeld haar promotieonderzoek naar de impact van Excel op de samenleving, maar vooral van haar drive te onderzoeken hoe zo veel mogelijk mensen – ongeacht hun achtergrond – kunnen leren programmeren), Joy of Coding, de Hedy programmeertaal (met veel support voor andere alfabetten dan wat we in de westerse wereld gebruiken) en haar boek The Programmer’s Brain: What every programmer needs to know about cognition.
Ze is enorm goed in haar werk, en komt daarmee regelmatig in aanraking met vooringenomenheid over vrouwen. Daar verbaast ze zich terecht over, en ook dat het lastig om content (op allerlei soorten gebieden) te consumeren gemaakt door vrouwen. Dat overkwam haar bijvoorbeeld bij het luisteren naar muziek op de Nederlandse radio: daar kwamen veel meer mannelijke artiesten aan bod dan vrouwelijke.
Vandaar FemFM, en Felienne zou Felienne niet zijn als de source code niet openbaar was, dus hier wat linkjes:
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Posted in Audio, Awareness, Development, IceCast, Inclusion / inclusive society, Java, Java Platform, Media, Power User, Python, Scripting, Software Development, Web Development | Leave a Comment »
Posted by jpluimers on 2024/01/24
I wasn’t aware that Java has some some catch-up and now supports user definable inline types: [Wayback/Archive] Inline Thinking | Patricia Aas – Programmer
Computers changed. They changed in many ways, but for the purpose of this text they changed in one significant way: The relative cost of reading from RAM became extremely high.
…
These “cache friendly” behaviors are already present in Java when using so called “primitive types”, like ints and chars. “Primitive types” are “inline types” and come with all of their advantages. So even though inline types may seem foreign in the beginning, you have worked with them before, you just might not have thought of them as objects. So when “inline classes” seem confusing, you could try to think: “What would an int do?”
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Posted in Development, Java, Java Platform, Software Development | Leave a Comment »
Posted by jpluimers on 2023/02/15
Forgot to schedule this in 2014, so here it finally is, as the content is still relevant:
A long time ago (almost 10 years) I did some stuff with State Machines in .NET.
Since then the world has changed, and a lot more libraries have become available.
As I mainly use .NET and Delphi and there is a reasonable chance I need to do some more state machine work, here are some links about State Machines in both environments.
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Posted in .NET, C#, Conference Topics, Conferences, Delphi, Development, Diagram, Event, Java, Java Platform, Software Development, UML | Leave a Comment »
Posted by jpluimers on 2023/01/19
After publishing Free Linux cloud shell for Gmail users – shell in the browser that works in all locations I’ve been so far, the Google Cloud Shell got extended quite a bit.
There is now [Wayback/Archive] Safe Mode (which skips initialisation scripts):
If there’s a problem in your .bashrc or .tmux.conf files, Cloud Shell immediately close after connection. To resolve this, open Cloud Shell in safe mode by appending cloudshellsafemode=true to the URL. This restarts your Cloud Shell instance and logs you in as root, allowing you to fix any issues in the files.
To permanently delete all files in your home directory and restore your Cloud Shell home directory to a clean state, you can reset your Cloud Shell VM.
And there is support for way more [Wayback/Archive] tools and languages:
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Posted in .NET, C#, Cloud, Development, Go (golang), Google, GoogleCloudShell, Infrastructure, Java, Java Platform, JavaScript/ECMAScript, Node.js, Perl, PHP, Power User, Python, Ruby, Scripting, Software Development | Leave a Comment »
Posted by jpluimers on 2022/10/06
An interesting thread by Kristian Köhntopp last year:
[Archive.is] Kristian Köhntopp on Twitter: “Python: >>> print(1+2+” = “+2+1) Traceback (most recent call last): File “”, line 1, in TypeError: unsupported operand type(s) for +: ‘int’ and ‘str’ Java: System.out.println(1+2+” = “+1+2); 3=12”
The examples from him and others in the thread:
Python:
>>> print(1+2+" = "+2+1)
Traceback (most recent call last):
File "", line 1, in
TypeError: unsupported operand type(s) for +: 'int' and 'str'
Java:
System.out.println(1+2+" = "+1+2);
3=12
php8.1 -r 'print 1+2+" = "+2+1;'
PHP Fatal error: Uncaught TypeError: Unsupported operand types: int + string in Command line code:1
Stack trace:
#0 {main}
thrown in Command line code on line 1
php7.3 -r 'print 1+2+" = "+2+1;'
PHP Warning: A non-numeric value encountered in Command line code on line 1
Node?
Chrome & FF dev console:
window.alert(1+2+" = "+1+2)
3 = 12
Sind ja immerhin verschiedene Sprachen.
SELECT Wert1
FROM table1
WHERE Wert1 < AVG(Wert1);
DB2 vs. Oracle vs. MSSQL vs. ....
The joke is that Python actually does better than Java.
But in practice, this is a problem on many platforms, so it deserves constant attention, that’s why Kristian pointed to [Archive] Anna “Legacy Archaeologist” Filina on Twitter: “My annotated slides “Fantastic Bugs and How to Avoid Them” from @LonghornPHP: #LonghornPHP”
[Wayback/Archive] Fantastic Bugs and How to Avoid Them – Speaker Deck
I’ve expanded the examples from the thread below. The results are interesting and consistent over versions of the various languages.
–jeroen
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Posted in Development, Java, Java Platform, JavaScript/ECMAScript, Node.js, PHP, Python, Scripting, Software Development | Leave a Comment »
Posted by jpluimers on 2022/08/02
Last year in OWASP top rated security “feature” A01:2021 – Broken Access Control, I promised to write more about how learn about OWASP documented and rated security vulnerabilities.
Today is the day you should start learning from [Wayback/Archive.is] Github: OWASP WebGoat:
Deliberately insecure JavaEE application to teach application security
It is a Java backend with a JavaScript/HTML frontend, but the vulnerabilities just as easily apply to other back-end stacks.
Repositories:
- [Wayback/Archive.is] WebGoat/WebGoat: WebGoat is a deliberately insecure application
WebGoat is a deliberately insecure web application maintained by OWASP designed to teach web application security lessons.
This program is a demonstration of common server-side application flaws. The exercises are intended to be used by people to learn about application security and penetration testing techniques.
WARNING 1: While running this program your machine will be extremely vulnerable to attack. You should disconnect from the Internet while using this program. WebGoat’s default configuration binds to localhost to minimize the exposure.
WARNING 2: This program is for educational purposes only. If you attempt these techniques without authorization, you are very likely to get caught. If you are caught engaging in unauthorized hacking, most companies will fire you. Claiming that you were doing security research will not work as that is the first thing that all hackers claim.
- [Wayback/Archive.is] WebGoat/WebGoat-Lessons: 7.x – The WebGoat STABLE lessons supplied by the WebGoat team.
This repository contains all the lessons for the WebGoat container. Every lesson is packaged as a separate jar file which can be placed into a running WebGoat server.
- [Wayback/Archive.is] WebGoat/WebWolf (Can’t have a goat without a wolf, but I wonder where the cabbage is)
- [Wayback/Archive.is] WebGoat/WebGoat-Legacy: Legacy WebGoat 6.0 – Deliberately insecure JavaEE application
This is the WebGoat Legacy version which is essentially the WebGoat 5 with a new UI.
This program is a demonstration of common server-side application flaws. The exercises are intended to be used by people to learn about application penetration testing techniques.
- [Wayback/Archive.is] WebGoat/WebGoat-Archived-Releases: WebGoat 5.4 releases and older
WebGoat 5.4 releases and older
- [Wayback/Archive.is] WebGoat/groovygoat: POC for dynamic groovy/thymeleaf based lesson system
POC to demonstrate dynamic lessons with groovy controller/thymeleaf templates
They are by OWASP:
The Open Web Application Security Project (OWASP) is an online community that produces freely-available articles, methodologies, documentation, tools, and technologies in the field of web application security.[4][5]The Open Web Application Security Project (OWASP) provides free and open resources. It is led by a non-profit called The OWASP Foundation. The OWASP Top 10 – 2021 is the published result of recent research based on comprehensive data compiled from over 40 partner organizations.
Very important is the [Wayback/Archive.is] OWASP Top Ten Web Application Security Risks | OWASP:
The OWASP Top 10 is a standard awareness document for developers and web application security. It represents a broad consensus about the most critical security risks to web applications.
Globally recognized by developers as the first step towards more secure coding.
Companies should adopt this document and start the process of ensuring that their web applications minimize these risks. Using the OWASP Top 10 is perhaps the most effective first step towards changing the software development culture within your organization into one that produces more secure code.
Changes in the OWASP Top 10 between 2017 and 2021:
More OWASP repositories (including the [Wayback/Archive.is] OWASP/Top10: Official OWASP Top 10 Document Repository and [Wayback/Archive.is] OWASP/www-project-top-ten: OWASP Foundation Web Respository which seem to be at a 4-year update interval got updated in 2021) are at [Wayback/Archive.is] Github: OWASP.
Related: [Archive.is] Jeroen Wiert Pluimers on Twitter: “This so much sounds like German government IT-projects: …”
Via:
–jeroen
Posted in Authentication, CSS, Development, Encryption, HTML, Java Platform, JavaScript/ECMAScript, Pen Testing, Scripting, Security, Software Development, Web Development | Leave a Comment »
Posted by jpluimers on 2021/09/22
For my link archive: [WayBack] GitHub – metasfresh/metasfresh: We do Open Source ERP – Fast, Flexible & Free Software to scale your Business.
It’s mainly written in JavaScript and Java with a PostgreSQL database and elasticsearch search.
There is plenty of [WayBack] metasfresh documentation (for users, administrators and developers), all with markdown source.
The developer documentation starts with a nice diagram of the [WayBack] metasfresh Architecture:
Markdown source of the architecture page: [WayBack] metasfresh-documentation/metasfresh_architecture.md at gh-pages · metasfresh/metasfresh-documentation · GitHub: Docs and Manuals for Devs, Users, Admins.
Via:
–jeroen
Posted in Development, Java, Java Platform, JavaScript/ECMAScript, Scripting, Software Development | Leave a Comment »
The Wiert Corner - irregular stream of stuff 