Editor Error Highlighting And Fix Suggestions Not works on v1.29.0

[bgunduz55]

When I update the extension 1.29.0 version, editor's error detection, highlight and suggestions not working.
Everything is fine after downgrade the version.

Environment

• Operating System: Linux Mint
• JDK version: 21
• Visual Studio Code version: 1.88.1
• Java extension version: 1.29.0

Additional Informations

I'm using vscode from flatpak. But looks that's not the case.

[rgrunber]

Is your project a Maven/Gradle project ? Does the project target Java 21 while having Java preview features enabled in the build configuration ? Any chance you'd be able to share the project ?

[bgunduz55]

Project is private. Maven project.
Targets Java 21:

Also current JAVA_HOME:

Preview Features enabled:

[snjeza]

@bgunduz55 Could you try to set the project target to Java 22?

[rgrunber]

I think you're facing the same issue as eclipse-jdtls/eclipse.jdt.ls#3131 . In 1.29.0, we added support for Java 22, and the --enable-preview flag is only supported for the latest Java version.

As @snjeza just mentioned, if you change the compiler compliance to 22 or leave it as is and remove the --enable-preview flag, does the issue go away ?

[bgunduz55]

Looks, that's the issue. I just tried remove --enable-preview and it worked on latest version.
I'll try changing compiler target version as 22 too, when I'm available.
Thanks for help @rgrunber @snjeza .
Is that normal to not use enable preview on 21 for this?

[snjeza]

Is that normal to not use enable preview on 21 for this?

Yes, it is when using VS Code 1.29.0

[rgrunber]

It has always been the case that preview feature support can only be used against the latest supported Java version (ie. 22) by the extension. https://bugs.eclipse.org/bugs/show_bug.cgi?id=549258#c11 also gives an explanation of this (and that to follow the JEP, one cannot allow --enable-preview to work except for the latest supported Java version.

I'm guessing this is just a lot more visible now because Java 21 is LTS. While before, people had no issues with updating to the latest release level to continue the 2nd/3rd/.. preview of feature , or consume it after it graduates to a standard feature, now users might wish to stay on the Java 21 LTS.

[fbricon]

Also documented in https://github.com/redhat-developer/vscode-java/wiki/Enabling-Java-preview-features