redhat-developer / redhat-developer/vscode-java

extension fails to activate on Windows

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Description

Here's a trimmed version of the error logs (with stack traced omitted). The only thing that stands out as possibly relevant is this:

Unresolved requirement: Require-Capability: osgi.ee; filter:="(&(osgi.ee=JavaSE)(version=25))"

Anything else I can try to debug or fix?

!ENTRY org.eclipse.core.resources 2 10035 2025-10-07 08:38:01.063
!MESSAGE The workspace exited with unsaved changes in the previous session; refreshing workspace to recover changes.

!ENTRY org.eclipse.osgi 4 0 2025-10-07 08:38:01.418
!MESSAGE An error occurred while automatically activating bundle org.eclipse.core.resources (31).
!STACK 0
org.osgi.framework.BundleException: Exception in org.eclipse.core.resources.ResourcesPlugin.start() of bundle org.eclipse.core.resources.

!ENTRY org.eclipse.jdt.ls.core 4 0 2025-10-07 08:38:01.423
!MESSAGE FrameworkEvent ERROR
!STACK 0
org.osgi.framework.BundleException: Error starting module. osgi.identity; type="osgi.bundle"; version:Version="1.52.0.202510040804"; osgi.identity="org.eclipse.jdt.ls.core"; singleton:="true" [id=58]

!ENTRY org.eclipse.osgi 4 0 2025-10-07 08:38:01.428
!MESSAGE Bundle org.eclipse.jdt.ls.core_1.52.0.202510040804 [58] is not active.

!ENTRY org.eclipse.osgi 4 0 2025-10-07 08:38:01.453
!MESSAGE An error occurred while automatically activating bundle org.eclipse.jdt.core (50).
!STACK 0
org.osgi.framework.BundleException: Error starting module. osgi.identity; type="osgi.bundle"; version:Version="3.44.0.v20251001-0848"; osgi.identity="org.eclipse.jdt.core"; singleton:="true" [id=50]

!ENTRY org.eclipse.osgi 4 0 2025-10-07 08:38:01.457
!MESSAGE An error occurred while automatically activating bundle org.eclipse.jdt.ls.core (58).
!STACK 0
org.osgi.framework.BundleException: Error starting module. osgi.identity; type="osgi.bundle"; version:Version="1.52.0.202510040804"; osgi.identity="org.eclipse.jdt.ls.core"; singleton:="true" [id=58]

!ENTRY org.eclipse.jdt.core.javac 2 0 2025-10-07 08:38:01.469
!MESSAGE Could not resolve module: org.eclipse.jdt.core.javac [52]
  Unresolved requirement: Require-Capability: osgi.ee; filter:="(&(osgi.ee=JavaSE)(version=25))"

!ENTRY org.eclipse.osgi 4 0 2025-10-07 08:38:01.470
!MESSAGE Application error
!STACK 1
org.eclipse.core.runtime.CoreException: Plug-in org.eclipse.jdt.ls.core was unable to load class org.eclipse.jdt.ls.core.internal.LanguageServerApplication.

See full log at https://gist.github.com/kevinushey/58783b118028d3a07edb0da67be8534d.

Contributor guide

Open the contributing guide

First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start by reproducing the Windows activation failure and inspect the org.eclipse.jdt.core.javac resolution error for the JavaSE 25 requirement. Trace how org.eclipse.jdt.ls.core and org.eclipse.core.resources activate, then verify the extension starts without the unresolved requirement and bundle errors.

Written by the indexing model from the issue text.

Assessment

Tech stack
java, vscode
Domain
devtools
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Needs clarification
Newbie friendliness
25/100

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