[NETBEANS-5491] UnsupportedClassVersionError - If I set the NetBeans Runtime to Java 16, I cannot run a project created in Java 15.

• Type: Bug
• Status: Resolved
• Priority: Blocker
• Resolution: Fixed
• Affects Version/s: 12.3
• Fix Version/s: 12.4
• Component/s: java - Platform, java - Project, java - Source
• Labels: java platform project runtime version

Environment

Windows 10, Apache NetBeans 12.3, Java 16

• Assignee: Svatopluk Dedic
• Reporter: Michal Rama
• Created: 24/Mar/21 18:42
• Updated: 11/Jun/21 19:00
• Resolved: 11/Jun/21 19:00

Description

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.

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

PS.

run:
Error: LinkageError occurred while loading main class example.TextHeight
	java.lang.UnsupportedClassVersionError: example/TextHeight (class file version 59.65535) was compiled with preview features that are unsupported. This version of the Java Runtime only recognizes preview features for class file version 60.65535
C:\Users\NAME_OF_USER\AppData\Local\NetBeans\Cache\12.3\executor-snippets\run.xml:111: The following error occurred while executing this line:
C:\Users\NAME_OF_USER\AppData\Local\NetBeans\Cache\12.3\executor-snippets\run.xml:68: Java returned: 1
BUILD FAILED (total time: 1 second)