2024¶

Alternatives to Oracle Java / Web Start

There are a few alternatives to Oracle Java, including an alternative for Java WebStart (which Oracle deprecated).

Due to Oracle no longer releasing updates for long-term support (LTS) releases under a permissive license, others have begun offering builds.Linux distributions have always offered their builds, and Windows also offers one now, which can be installed with the Windows Package Manager.

https://adoptium.net/temurin/releases/

https://adoptium.net/temurin/archive/

Oracle JRE (Web Start) Alternative
Java JRE alternatives (Web Start) can be a combination of (AdoptOpenJDK and icetea-web)

What is Iced-Tea-Web
https://adoptopenjdk.net/icedtea-web.html

What is OpenWebStart
OpenWebStart is an open-source implementation of the Java WebStart technology, which was deprecated by Oracle in Java 11. OpenWebStart provides a similar experience, allowing you to launch Java applications from the web.

1. Supports JNLP (Java Network Launch Protocol).
2. Compatible with various JDK distributions.
3. Regular updates and community support.

Installation: OpenWebStart can be installed independently of the JDK, and it works with any of the above alternatives

Summary:
For a free, open-source alternative with continued support, OpenJDK or Eclipse Temurin is a great choice.

For enterprise needs, Zulu or Amazon Corretto are excellent options, offering more stability and long-term support.

For replacing Java WebStart, OpenWebStart is the go-to solution across all these JDKs.

Which one to Choose?
If you're looking for a modern, actively developed alternative that closely mirrors Oracle’s original Java WebStart, OpenWebStart might be the better choice. It offers a more refined user experience and advanced features like multiple JRE management.

If you prefer a more mature, widely-used tool with a proven track record, IcedTea-Web could be more reliable, especially if you're working in environments where it has already been adopted.

Web Articles

Clear the Java Web Start (javaws) cache

1. Open your computer's DOS prompt by selecting the Start menu followed by the Run option. Then, enter command followed by pressing the Enter key.

2. Type javaws at the DOS prompt followed by the Enter key to see the Java Web Start command-line options.

3. Type javaws -Xclearcache followed by the Enter key to clear Java Web Start Cache on your computer. After the cache has been cleared, the local drive prompt will appear on the DOS prompt.

This will be the command to clear cache

// Remove all non-installed applications from the cache.
javaws -clearcache 

// Remove all applications from the cache
javaws -uninstall

Alternatively, do the following:

1. Delete the cache folder located on Windows

   "C:\Users\<user>\AppData\LocalLow\Sun\Java\Deployment"
   

2. For other Operating System versions, you might have to do the delete operation in the appropriate Sun Java folder.

Articles Web

You can do it using Java Control Panel

How do I clear the Java cache?

How can do it in command line?

[Fixed] fatal: credential-cache unavailable; no unix socket support

To delete the entry for helper, do run following command in your git bash/powershell:

git config --global --unset credential.helper

or 

git config --global credential.helper wincred

or 

git config --global credential.credentialStore wincredman --replace-all 

How to check all the apache httpd processes in Linux

When we want to find a list of processes running on a Linux box, we use.

ps -fax

ps -fax | grep httpd

or

ps -ef | grep httpd

To know the number of httpd processes running apply ‘wc -l’ command like

ps -fax | grep httpd | wc -l
ps -ef | grep httpd | wc -l

[Fixed] Unsigned application requesting unrestricted access to system

Subject/ Problem Description

The following error is displayed when launching applications signed with the MD5withRSA or MD5withDSA algorithms after upgrading to Java.

Unable to launch the application.
Unsigned application requesting unrestricted access to system
Unsigned application requesting unrestricted access to system. 
The following resource is signed with a weak signature algorithm MD5withRSA 
and is treated as unsigned: http://example.net/ExampleApplication.jar

Applications signed with the MD5withRSA or MD5withDSA algorithms are treated as unsigned by Java starting with the Java 8 Update 131 release.

How to remove all git commit history

git checkout --orphan latest_branch

git add -A

git commit -am "your new commit message"

git branch -D main

git branch -m main

git push -f origin main

How to set semaphore limits

In some scenario, the application had a semaphore limit issue. We need to increase some semaphore limits, such as semaphore array.

What values should we set for the semaphore limits?

# ipcs -ls

------ Semaphore Limits --------
max number of arrays = 1024              ## SEMMNI
max semaphores per array = 250           ## SEMMSL
max semaphores system wide = 256000      ## SEMMNS
max ops per semop call = 32              ## SEMOPM
semaphore max value = 32767

What is -h vs --help in Linux command?

Forward slash vs Backslash

Backslash (Windows) and Forward Slash (Linux)

The documentation uses backslashes ( \ ) for Windows and forward slashes ( / ) for Linux environments. When the documentation mentions a backslash, the forward slash implicitly applies to Linux.

Linux vs Windows Commands