No delegateCommandHandler for vscode.java.startDebugSession #1611

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1. github-actions commented on Feb 23, 2026

   

   github-actionsBot

   on Feb 23, 2026 – with GitHub Actions

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   Hi KrithikPatil, 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.

   Solution

   • Make sure you’re running the latest Language Support for Java and Debugger for Java extensions (v0.49.0 or later). An important fix for this exact error was shipped in vscode-java 0.49.0.
     • Changelog: https://github.com/redhat-developer/vscode-java/blob/master/CHANGELOG.md#0490-september-18th-2019
   • After updating, reload VS Code and restart the Java Language Server:
     1. Open the Command Palette (⇧⌘P / Ctrl+Shift+P).
     2. Run Java: Clean the Java language server workspace.
     3. Reload Window.
   • If the problem persists, consult the official troubleshooting guide:
     • https://github.com/microsoft/vscode-java-debug/blob/master/Troubleshooting.md#no-delegatecommandhandler-for-vscodejavastartdebugsession-when-starting-debugger

   Duplicate Issue

   • No delegateCommandHandler for vscode.java.startDebugSession when starting Debugger #728

     “No delegateCommandHandler for vscode.java.startDebugSession when starting Debugger”

   Other references with low confidence

   • Get Error "No delegateCommandHandler for 'xxx'" eclipse-jdtls/eclipse.jdt.ls#1146 (comment)
     • Describes a caching issue in jdt.ls’s WorkspaceExecuteCommandHandler that can trigger “No delegateCommandHandler …”.

   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!
2. github-actions

   added

   ai-triaged

   bug

   on Feb 23, 2026
3. wenytang-ms commented on Mar 23, 2026

   

   wenyt (wenytang-ms)

   on Mar 23, 2026

   Contributor

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   KrithikPatil
   please share your versions of java extensions, vscode-java, java debug, redhat-java.
   is the error msg showed as windows?
4. wenyt (wenytang-ms)

   added

   needs more info

   on Mar 30, 2026
5. github-actions commented on Apr 14, 2026

   

   github-actionsBot

   on Apr 14, 2026 – with GitHub Actions

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   This issue has been closed automatically because it needs more information and has not had recent activity. Please reach out if you have or find the answers we need so that we can investigate further.
6. github-actions

   closed this as completedon Apr 14, 2026