Update Java LS Project's compliance to Java 21

[snjeza]

The related PR - #3358
Steps to reproduce:

• open the Java LS projects in Eclipse

You will get Expression type cannot be a subtype of the Pattern type at

eclipse.jdt.ls/org.eclipse.jdt.ls.core/src/org/eclipse/jdt/ls/core/internal/handlers/NavigateToDeclarationHandler.java

Line 96 in 2102508

if (methodDeclaration instanceof IMember member && member.getClassFile() != null) {

[rgrunber]

I agree those references should be updated, but why am I not seeing this in my workspace ?

[snjeza]

I agree those references should be updated, but why am I not seeing this in my workspace ?

I'm not sure.

java21.mp4

[snjeza]

test this please

[rgrunber]

Ah, I think you're rightly running into eclipse-jdt/eclipse.jdt.core#3478 . I'm running off of 2024-09 . update: ugh, I really should get at least on 2025-03 M1.

[snjeza]

Ah, I think you're rightly running into eclipse-jdt/eclipse.jdt.core#3478 . I'm running off of 2024-09 .

Do you have Java 17 in your workspace?

[rgrunber]

I had it under the execution environment settings but my bundles listed Java 21 as their JRE :

Update:
@snjeza , I can confirm I see the error with I20250116-0550 but not with I20250102-1800 (M1).

[snjeza]

I had it under the execution environment settings but my bundles listed Java 21 as their JRE :

Could you try to add a JRE 17?

[snjeza]

test this please

[rgrunber]

LGTM. Thanks for catching this.