Develop Reference

How to run java11 and jfx11 application on jre1.8

I am a computer student and I had during my internship in a company, develop a small java software using JavaFX, maven, and apache.poi.
Info: The application works on Intellij and builds perfectly, my problem concerns the *.jar that I generate once the project is finished.
I first used JDK 14 and JFX14, however at the time of the execution (java –jar xx.jar) I had an error saying that I was compiling the program in JAVA 58 (JAVA 14) and that I was using JRE 52 (JAVA 8).
So I modified the project to compile with JDK 11 and JFX 11, and I now have the same error telling me that I am compiling the program in JAVA 55 (JAVA 11) and that I was using JRE 52 (JAVA 8).
The error comes from the fact that my PC uses jre1.8.0_251 by default.
So I tried to launch the program in this way "path_to_jdk11 \ bin \ java.exe" -jar xxx.jar and it works.
So that's my problem:
The majority of users use the version of JAVA offered on the Oracle site, i.e. jre1.8.0_251 which is the latest version available. Outside my program requires Java 11, which is not deploying on corporate PCs, I imagine.
I tried to port my project to java 8 but I have errors with Maven and the module.info.java.
Do you have a tip for deploying the *.jar or deploying it in .exe so that it can run with a user who has jre1.8.0_251?
Respectfully

Don't try to build a fat jar. It won't work with modern Java. Instead build a real installer. This can be done easily with JDK 14+. Just follow this tutorial https://github.com/dlemmermann/JPackageScriptFX which covers everything you need. This uses jpackage from JDK 14 and some other tools from it and also works with non-modularized projects. When you install JDK 14 just make sure you set JAVA_HOME and your PATH correctly so that all the tools find the correct version of Java for building.

Jenkins on Windows returns unsupported JVM error when Java is updated to OpenJDK 11

I have been testing updating Oracle Java 8 to Red Hat OpenJDK Java 11 on a Windows Jenkins server, but I seem to have hit a wall. My Jenkins instance is stating that Java 11 is unsupported, returning the following error after I updated the JENKINS_HOME JRE files:
"We detected that your JVM is not supported by Jenkins. This is due to the limitation is one of the libraries that Jenkins uses, namely XStream. See this FAQ for more details."
Steps I've taken:
1. Stopped and disabled Jenkins service
2. Uninstalled Oracle Java 8 191 from control panel and removed remaining program files at Java\jdk1.8.0_191
3. Installed Red Hat OpenJDK 11.0.4 msi to Java\jdk11.0.4
4. Updated JAVA_HOME and PATH variables to point to new Java locations
5. Created JRE 11 from the JDK 11 files using all modules in JDK. Specifically I utilized this site for assistance creating the JRE. Placed JRE files on the server in the standard location, Java\jre11.0.4
5. Set Jenkins service to automatic and started it. Confirmed Jenkins site was working properly, then stopped and disabled service again
6. After backing up JENKINS_HOME, replaced the JRE folder there with the jre11.0.4 folder I created from the JDK 11 files.
7. Started Jenkins service. After navigating to the Jenkins site, I received the error message about the JVM being unsupported.
8. Stopped/disabled the Jenkins service, then updated the Jenkins.war to Jenkins 2.194 weekly release. (I was previously running Jenkins LTS 2.176.3.) Started Jenkins service, only to receive the same error.
I'm not sure how to proceed, the "Upgrading Jenkins Java version from 8 to 11" Jenkins documentation isn't much help at this point. The last step in the Upgrading Jenkins section says to "Use a package manager to install the new JVM" and to "Make sure the default JVM is the newly installed version. If it is not, use the correct java command in the Jenkins startup scripts". These instructions appear to be specific to Jenkins instances running on Linux OS. If they are for all OS types, I am unsure how to follow them in a Windows environment.
I've also reviewed Jenkins' documentation for Running Jenkins on Java 11, but didn't find any useful information there either.
And finally the FAQ hyperlink in the error message does not work, and the only information provided by this similarly named XStream site is a note stating XStream requires Java 8, which is in direct conflict with Jenkins' Java documentation that says Jenkins supports Java 8 and 11.
Any suggestions for getting any version of Jenkins to run with OpenJDK 11 or what my next steps should be here would be greatly appreciated.
Software and versions:
- Windows Server 2016
- Jenkins LTS 2.176.3
- Jenkins weekly release 2.194
- Oracle Java JDK and JRE 1.8.0.191
- Red Hat OpenJDK 1.11.0.4 and JRE created from all modules in the JDK files

So it seems I missed the following instructions in the Jenkins.xml file:
If you'd like to run Jenkins with a specific version of Java, specify
a full path to java.exe.
Another member of my team saw this and added a JAVA11_HOME environment to the Jenkins.xml file:
<env name="JAVA11_HOME" value="D:\Java\jdk11.0.4"/>
And then updated the executable path in the Jenkins.xml:
From the default:
<executable>%BASE%\jre\bin\java</executable>
To:
<executable>%JAVA11_HOME%\bin\java</executable>
Jenkins is finally up and running on Java 11!

JBPM6 install Issue - Jboss server and eclipse not opening

I am new to BPM and I am trying to learn jBPM6. I downloaded it and followed the steps that are provided in the document. I was trying to demo using ant install.demo. It worked up until I installed jbpm modular, but I got the following error: No virtual machine found. I have setup JAVA_HOME and ANT_HOME as well as the path system variable.
Path : %JAVA_HOME%\bin;%ANT_HOME%\bin;C:\Program Files (x86)\HP SimplePass\x64;
JAVA_HOME : C:\Program Files\Java\jdk1.7.0_09
ANT_HOME : C:\ant
JBOSS_HOME : C:\jbpm-installer\jboss-as-7.1.1.Final
BUILD FAILED
C:\jbpm-installer\build.xml:508: JBoss application server did not start within 5 minutes
Note : i using windows8 - 64 bit.

Regarding the issue :BUILD FAILED C:\jbpm-installer\build.xml:508: JBoss application server did not start within 5 minutes
Check the jboss serverlog for issues.
One thing I got was that, the jbpm 6 default installation tries to download a sample jbpm application project which is hosted in github. If we have no access to gihub it would the server startup would wait and would fail.
You can also increase the timeout ( But for sure if there is no other problem jboss boots up faster than the 5 mins limit ) in the build.xml goto target and change the attribute maxwait in the waitfor tag.
For an assurance, I could get the jbpm environment up with the install.demo in windows 8 64 bit machine, the only problem was the connectivity with github. And the only difereence was I was using Java 1.6

running neo4j in a machine with java 1.6

I am trying to run neo4j for the first time.
In my RHEL 6 machine, I have Java 1.6 installed. I do not want to change that because other programs are using that. When I tried to run neo4j, downloaded from here, I got the error: ERROR! Neo4j cannot be started using java version 1.6.0_24. Please use Oracle(R) Java(TM) 7. Clearly, I need to install JAVA 7. I was wondering if I can just download Java 7 and let neo4j know the path to java executables.

Set the JAVA_HOME and PATH before starting the neo4j server.
set the path on the terminal.
export JAVA_HOME=/home/jdk/jdk1.7.0_45
export PATH=$JAVA_HOME/bin:$PATH
then start the neo4j or you can create a bash script to do this automatically.

The different major versions are normally different packages (e.g., java-1.7.0-openjdk-devel) that go in different directories (usually in /opt), and you can set the JAVA_HOME and/or JDK_HOME environment variables in your startup script. That said, there's rarely any harm in running your programs on the version 7 JVM (just like you can upgrade the kernel without touching your installed programs), and Java 6 is EOL and won't get new security updates.

neo4j 2.0.2 uses java7 it seems and hence requires jdk7.
Go to neo4j website and download 1.8.3 version
http://dist.neo4j.org/neo4j-community-1.8.3-unix.tar.gz
and if you have java 1.6.45 in ubuntu, you are done
untar and copy to /opt and issue the below command from neo4j root directory
sudo ./bin/neo4j start

Apache ANT Version issues during Netbeans Building

I'm trying to build a java project using netbeans ide,but i keep getting
Please build using Ant 1.8.0 or higher
error,i think this is due some version difference in the netbeans IDEs,
How can i resolve this issue

In NetBeans options, you can set Ant home. Point this to the other installation.
Mine is:
/usr/local/netbeans-7.2.1/java/ant
the default installed with netbeans.

It doesn't work for me...
I got ant version 1.9.10 and java openjdk 11.0.6 (on linux LEAP 15.1)
I want to build without launching Netbeans 10 in order to automate the copy/build process of my application stored on a distant server (lock down style ^^).
each time I use the command ant -buildfile build.xml I got this error message :{
After seeking and observing, I find out that netbeans uses its "own" ant version but either the command, outputed to Outout tab,
ant -f /netbeans/java/MagicArena -Dnb.internal.action.name=rebuild clean jar
nore
/usr/local/netbeans/extide/ant/bin/ant -f /netbeans/java/MagicArena -Dnb.internal.action.name=rebuild clean
...are giving (BIG) satisfaction :{
I got the same message at command line:
/netbeans/java/MagicArena/nbproject/build-impl.xml:111: Java 9 support requires Ant 1.10.0 or higher
:{