Develop Reference

JavaFX on Oracle Linux 8.6

I have a Java application which uses javaFX to process images (using the javafx.scene.image.Image and some related functionality, and instantiating an javafx/embed/swing/JFXPanel object to force JavaFX to initialise). I'm trying to run this application on an Oracle free server running Oracle Linux 8.6 with Oracle Java 1.8.0_351 (OpenJDK and Oracle Java 19 give errors relating to JavaFX not being present). I've compiled my application into a JAR (compiling for Java 1.8.0_301 using Oracle Java on Windows). However, on the server, this doesn't work; I get the exception java.lang.UnsupportedOperationException: Unable to open DISPLAY.
This question's answer suggests using xvfb:
Deploy JavaFX on Ubuntu server without display
I've tried this, but get a "GLX version 1.3 or higher is required" error instead.
Is there a solution for running JavaFX with Oracle Linux?
What I've tried:
I've tried with two different OSes available with Oracle free;
Oracle Linux 8.6
OpenJDK was installed with sudo dnf install java-1.8.0-openjdk-devel.x86_64.
Running the jar gives the NoClassDefFoundError error.
I couldn't work out how to install javafx with dnf on Oracle Linux.
I decided to give Oracle Java a go; OpenJDK was unlinked with sudo unlink /etc/alternatives/java.
The Oracle jdk 19 was downloaded and installed with sudo rpm -ivh jdk-19_linux-x64_bin.rpm. Running the jar (with java -jar MyJar.jar) still gives the same error.
I tried uninstalling that (with sudo dnf remove jdk-19) and openJDK (with sudo dnf remove java) and installing Oracle Java 1.8.0 from a .rpm file. I then get an java.lang.UnsupportedOperationException: Unable to open DISPLAY error.
Xvfb was installed using sudo dnf install xorg-x11-server-Xvfb. xdpyinfo was installed using sudo dnf install xdpyinfo.
Xvfb was started using export DISPLAY=:99 and sudo xdpyinfo -display $DISPLAY > /dev/null || Xvfb $DISPLAY -screen 0 1024x768x16 & (taken from here: https://unix.stackexchange.com/a/297882 )
When running the JAR, I then get the exception
ES2 Prism: Error - GLX extension is not supported
GLX version 1.3 or higher is required
java.lang.UnsupportedOperationException: Internal Error
Canonical Ubuntu 22.04 Minimal
OpenJDK was installed with sudo apt-get install openjdk-8-jdk.
Running the jar gives the NoClassDefFoundError error.
OpenJFX was installed with sudo apt-get install openjfx. Same error.
I tried running the JAR with --module-path argument pointing to /usr/share/openjfx/lib/; --module-path is an unrecognised option with Java 8.
I upgraded to the latest openjdk sudo apt-get install openjdk. After this I'm able to use --module-path.
I tried running the JAR with java --module-path /usr/share/openjfx/lib/ --add-modules javafx.controls,javafx.base,javafx.graphics,javafx.swing -jar MyJar.jar (I'm not sure which modules correspond to which packages...). This causes a java.lang.UnsupportedOperationException: Unable to open DISPLAY error.

Unity - no java runtime present requesting install

I used Unity Hub to install Android build tools. I can locate these files on my computer. I set JAVA_HOME and "java -version" command works fine. When I try to build I get following error: No Java runtime present, requesting install. what can I do?
Unity Version: 2019.4.9f1.
Mac OS Catalina
Errors

I downloaded and installed JDK manually and finally it worked

Netbeans is not getting installed in my Mac, it says JDK not found, though JDK is installed in the same

Error: Failure while executing the commands mentioned below:-
/usr/bin/sudo -E -- env LOGNAME=ajaygautam USER=ajaygautam USERNAME=ajaygautam /usr/sbin/installer -pkg /usr/local/Caskroom/netbeans/8.2/NetBeans\ 8.2.pkg -target / exited with 1.
Here's the output:
installer: Error - NetBeans IDE cannot be installed. Java (JRE) found on your computer but JDK 8 or newer is required. Please download and install the latest update of JDK 8 from http://www.oracle.com/technetwork/java/javase/downloads/index.html and restart NetBeans installation.
Would someone in tracing out the issue above? I'm not able to install NetBeans 8.2 package in my Mac.

I got the same problem and could to fix it with brew.
firstly install java JDK https://www.oracle.com/java/technologies/javase-downloads.html then run this in your terminal:
brew install netbeans
it will install the latest version of netbeans.

Download OpenJDK from Archived OpenJDK GA Releases.
This will give you a file such as openjdk-9.0.4_osx-x64_bin.tar. Extract the tar file and copy it to the correct place in your machine.
tar -xf openjdk-9.0.4_osx-x64_bin.tar
sudo cp -r jdk-12.0.2.jdk /Library/Java/JavaVirtualMachines/
Now you can run the Netbeans installer.

i just install using brew
brew install netbeans
and now i can use the latest 12.4

The following steps are used to install NetBeans on MacOS:-
1) Download the Latest version
In order to install NetBeans on MacOS, we have to download the latest version of NetBeans by visiting its official website I.e. https://netbeans.org/downloads/
2) Mount the disk image file
The dmg file which is downloaded from the official website of NetBeans is to be mounted to an installer. This can be done with the following command:
$ hdiutil mount Downloads/netbeans-8.2-macosx.dmg
3) Install the file
The file is mounted to the volumes directory which contains a package file (.pkg) which is installable by using the installer command. The command needs superuser privileges for which, sudo is used.
$ sudo installer -pkg Volumes/ NetBeans\ 8.2/NetBeans\ 8.2.pkg -target /
The file will be installed to the target root which is mentioned while installing the file.
4) Unmount the file
After the completion of installation process, we need to unmount the installer. This can be done by using the option Unmount with hdiutil command.
$ hdiutil unmount /Volumes/NetBeans\ 8.2
Well, we have done with the installation process of NetBeans 8.2 on MacOS.

Actually, java_home is in
/System/Library/Frameworks/JavaVM.framework/Versions/Current/Commands/java_home
but in my case, java_home was in the next location i.e
/System/Library/Frameworks/JavaVM.framework/Versions/A/Commands/java_home
I deleted my java_home from /usr/libexec/java_home by root user
added new java_home in /usr/libexec by following command
sudo ln -s /System/Library/Frameworks/JavaVM.framework/Versions/A/Commands/java_home /usr/libexec/.

For some reason, some Netbeans versions for Mac OS do not detect the JDK contained in JRE. For proper installation and running the application, you must have Java for Mac OS installed previously. https://www.java.com/es/download/

Install The Lates Version ONLY which is 12.1 as of now!
https://netbeans.apache.org/download/nb121/nb121.html

Jenkins installtion using java 1.6

I am trying to install Jenkins on a Solaris 5.10 machine and the Java version 1.6.0_161. I executed
"java -jar jenkins.war"
to install Jenkins but got the following log.
$ java -jar jenkins.war
Jenkins requires Java8 or later, but you are running 1.6.0_161-b13
from /usr/jdk/instances/jdk1.6.0/jre
java.lang.UnsupportedClassVersionError: 50.0
at Main.main(Main.java:124)
Its an Int server and we cannot upgrade java. Please let me know how to install jenkins in this using java 1.6.0_163

Please let me know how to install jenkins in this using java 1.6.0_163
The error message tells you already Jenkins requires Java8 or later. Why do you believe there would be a way to run in with Java 6?
If it would be enough to install Java for a specific user you could download the JDK/JRE from [1] and follow the installation instruction [2].
[1] http://www.oracle.com/technetwork/java/javase/downloads/java-archive-javase8-2177648.html
[2] https://docs.oracle.com/javase/8/docs/technotes/guides/install/install_overview.html#A1012444

Java Developer Kit executable unable to be found

I'm trying to install mysql on my Mac using the command
sudo apt install mysql
and it said I needed to install JDK on it. So I installed JDK but am receiving an error saying:
Unable to locate an executable at "/Library/Java/JavaVirtualMachines/jdk-9.jdk/Contents/Home/bin/apt" (-1)
I have updated my env path to
JAVA_HOME=/Library/Java/Home
But when I install JDK theres no java file anywhere in my library, even though when I check to see if I have installed it, it is successfully found. I've installed Homebrew but do not know what package to install after the initial installation, or if this is the problem.
Any help would be appreciated.

If you are using Mac it would be much easier to install Homebrew from https://brew.sh and then use $ brew install mysql
see this link for the apt and yum command usage