Michal Rama created NETBEANS-5491:
-------------------------------------

             Summary: UnsupportedClassVersionError - If I set the NetBeans 
Runtime to Java 16, I cannot run a project created in Java 15.
                 Key: NETBEANS-5491
                 URL: https://issues.apache.org/jira/browse/NETBEANS-5491
             Project: NetBeans
          Issue Type: Bug
          Components: java - Platform, java - Project, java - Source
    Affects Versions: 12.3
         Environment: Windows 10, Apache NetBeans 12.3, Java 16
            Reporter: Michal Rama
         Attachments: obr�zek02.png, obr�zek41.png

Hello,

I installed Java 16 and set it in the etc\netbeans.conf file

*netbeans_jdkhome="C:\Program Files\Java\jdk-16"*

However, upon startup, all projects reported an error. NetBeans automatically 
set the Java Platform to JDK 16 for them, but the Source / Binary format was 
still JDK 15.

 !obr�zek41.png! 

 !obr�zek02.png! 

So it was enough to change it to JDK 16, except for one project that still 
can't be run and I didn't figure out why.

To run this project I need to close NetBeans and run it again in Java 15.

Creating a new project in Java 16 would probably solve the problem, but why 
should I do it when there was no problem with all the other projects.

Please help.

Thank you



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