Debugging & inspection of variables causes com.sun.jdi.ObjectCollectedException

[mozhuanzuojing]

[provide a description of the issue]

Debugging & inspection of variables causes com.sun.jdi.ObjectCollectedException

Environment

• Operating System: Windows_NT x64 10.0.17134
• JDK version: 16
• Visual Studio Code version: 1.57.0-insider (system setup)
• Java extension version: 0.79.1
• Java Debugger extension version: 0.33.1

Steps To Reproduce

1. View the contents of the variable collection in the breakpoint.
2. switch 2 ~ 3 times Disable Logical Structure View and Enable Logical Structure View at Parent Collection Object and Child Collection Object. (Random combination)

---

Sometimes there will be problems

• see Debugging & inspection of variables causes com.sun.jdi.ObjectCollectedException

eclipse 4.18 has been resolved

• open https://www.eclipse.org/eclipse/news/4.18/jdt.php
  search com.sun.jdi.ObjectCollectedException

Current Result

Expected Result

Additional Informations

[houtaru]

I have the same problem. In my case, I use ConcurrentHashMap<String, HashSet<String>>:

public void put(ConcurrentHashMap<String, HashSet<String>> mark) {
  HashSet<String> col = new HashSet();
  mark.put('1', col);
  col.put("abc');
}

When col end its life circle, the value of mark.get('1') become: com.sun.jdi.ObjectCollectedException

[robaho]

This is still an issue in VSCode 1.81.1

[github-actions]

Hi @mozhuanzuojing, I'm an AI Support assistant here to help with your issue. While the team reviews your request, I wanted to provide some possible tips and documentation that might help you in the meantime.

• This is a known JDI issue when toggling the Logical Structure View, tracked here: StackOverflow explains it and shows it was fixed in Eclipse 4.18:
  • Debugging & inspection of variables causes com.sun.jdi.ObjectCollectedException
    https://stackoverflow.com/questions/49004564
  • Eclipse 4.18 JDT release notes (search “ObjectCollectedException”):
    https://www.eclipse.org/eclipse/news/4.18/jdt.php
• Workaround: avoid rapidly enabling/disabling Logical Structure View on the same object.
• Permanent fix: upgrade to a debugger build that includes Eclipse JDT 4.18+ (ships JDI patches). In VS Code, update the Java Extension Pack / Java Debugger to the latest insider or nightly build.

The team will respond to your issue shortly. I hope these suggestions are helpful in the meantime. If this comment helped you, please give it a 👍. If the suggestion was not helpful or incorrect, please give it a 👎. Your feedback helps us improve!