Breakpoints don’t bind when attaching to JVM in WSL2 from Windows (Cursor/VS Code) — requests hang, `jdb` hits fine

[clertonbruno]

Environment

• Host OS: Windows 11
• IDE: Cursor/VS Code on Windows with repo mounted via WSL2
• Guest OS: WSL2 Ubuntu 22.04
• Java: OpenJDK 1.8.0_432 (Java 8)
• Extensions:
  • Debugger for Java: latest version
  • Language Support for Java™ by Red Hat: 1.47.0
• Project: Spring Boot API (Gradle)

Expected behavior
Attach to 127.0.0.1:5005 and stop at breakpoints in controllers; HTTP requests hang until continued.

Actual behavior
Attach connects but IDE never stops at breakpoints; HTTP requests hang. Attaching with jdb hits breakpoints fine, so JDWP works. Rolling back both extensions fixes it.

Steps to reproduce

1. Build: ./gradlew clean assemble -x test
2. Run jar with JDWP:

   java -agentlib:jdwp=transport=dt_socket,server=y,suspend=y,address=5005 \
        -Dspring.profiles.active=local -Duser.timezone=UTC \
        -jar build/libs/*.jar

3. In Windows Cursor/VS Code, attach to host 127.0.0.1 port 5005.
4. Set breakpoint in a @RestController method.
5. Call the endpoint.

More info

• javap -v shows SourceFile and LineNumberTable.
• Verified JDWP by attaching via jdb -attach 127.0.0.1:5005; breakpoints hit.
• Rolling back Debugger for Java (e.g., to 0.58.2) and Language Support for Java (e.g., to 1.46.0) resolves the problem.

Workaround
Roll back both Java extensions or use jdb.

Notes
Seems specific to Windows host + WSL2 remote debug mapping; not reproducible with native Windows debug.