Hi @fhuonder, 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.

Suggestions

This is a known issue in the Java Debugger for VS Code. You can track progress and comment on the primary issue:
- Debugging one-line lambdas doesn’t hit breakpoints: Debugging in one-line lambdas does not work vscode-java-debug#1546
Ensure you’re on the latest Java Debugger extension and that your code is compiled with debug symbols (e.g., javac -g).
Provide a minimal reproducible example (small project) demonstrating the one-line lambda and your launch configuration.

Duplicate Issue

Debugging in one-line lambdas does not work vscode-java-debug#1546

Related High-Confidence Reference

Can not debug lambda expression
- Reports inability to hit breakpoints within lambda expressions. No workaround yet.

Other references with low confidence

Issue #1340: Generic “Administration” template without lambda details.
Issue #1375: “cv” – no specific steps for lambdas.
Issue #1351: “not run any file” – unrelated to lambda debugging.

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!

Debugging in one-line lambdas does not work #588

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