Support "Suspend VM" and "Suspend Thread" Breakpoint Modes #608

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1. tsmaeder commented on Oct 16, 2025

   

   Thomas Mäder (tsmaeder)

   on Oct 16, 2025

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   As I read the VS Code UI code, this should then just show up in the UI, as well.
2. github-actions commented on Oct 16, 2025

   

   github-actionsbot

   on Oct 16, 2025 – with GitHub Actions

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   Hi Thomas Mäder (@tsmaeder), 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

   • Review the Debug Adapter Protocol (DAP) specification for SetBreakpointsRequest to understand how capabilities are declared and how breakpoint payloads are structured:

     • https://microsoft.github.io/debug-adapter-protocol/specification#setbreakpointsrequest

   • In the vscode-java-debug extension:

     1. Add a new capability in the initialize response (e.g. breakpointModes) in javaDebugProtocol.ts.
     2. Extend your client-side UI to allow users to choose between VM and Thread suspend modes when setting a breakpoint.
     3. In JavaBreakpointManager.ts, inspect the incoming breakpoint payload for the chosen mode and call the corresponding JDI API:
        • BreakpointRequest.setSuspendPolicy(EventRequest.SUSPEND_ALL) for “Suspend VM”
        • BreakpointRequest.setSuspendPolicy(EventRequest.SUSPEND_EVENT_THREAD) for “Suspend Thread”
     4. Test that the adapter honors the selected mode by verifying whether all threads suspend or only the breakpoint’s thread suspends.

   Labels

   • enhancement

   Duplicates

   None

   Other references with low confidence

   • Java remote attach to debug not hitting breakpoints: discusses use of suspend=y vs suspend=n when launching the JVM, but not per-breakpoint suspend modes.
     • Java remote attach to debug not hitting breakpoints. vscode-java-debug#755 (comment)

   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!
3. github-actions

   added

   enhancement

   ai-triaged

   on Oct 16, 2025
4. tsmaeder commented on Oct 17, 2025

   

   Thomas Mäder (tsmaeder)

   on Oct 17, 2025

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   I'm working on an PR for this. Should be landing next week.