No delegateCommandHandler for vscode.java.resolveMainMethod

[M-k-03]

After installing the Java extensions in VS Code, the Run/Debug option does not work and the following error appears:

No delegateCommandHandler for vscode.java.resolveMainMethod

Additionally, VS Code shows:
The version of required extension "Language Support for Java™ by Red Hat" is too stale. Please update it and reload the page.

The Java Language Server does not start, and the main() method is not detected.

Environment

• VS Code: (add your version)
• JDK: Microsoft OpenJDK 21 (C:\Program Files\Microsoft\jdk-21.0.10.7-hotspot)
• OS: Windows
• Extensions: Extension Pack for Java

Steps Already Tried

• Updated and reinstalled Java extensions
• Deleted .vscode, extensions, extensionsCache, and extensionsObsolete
• Restarted VS Code and system
• Manually configured java.configuration.runtimes

Issue still persists.

[github-actions]

Hi @M-k-03, 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

• Update the Language Support for Java™ by Red Hat extension to the latest version in the Extensions view, then reload VS Code.
  URL: https://marketplace.visualstudio.com/items?itemName=redhat.java
• Ensure Debugger for Java is installed and up-to-date.
  URL: https://marketplace.visualstudio.com/items?itemName=vscjava.vscode-java-debug
• Run Java: Clean the Java Language Server Workspace from the Command Palette (Ctrl+Shift+P), then reload the window.
• Verify your JDK21 is correctly configured under java.configuration.runtimes or via java.home in settings.json.

Duplicate issue

• No delegateCommandHandler for vscode.java.resolveMainMethod #1308
  Same error: “No delegateCommandHandler for vscode.java.resolveMainMethod.”

Other references with low confidence

• Title: Version 1.41.1 breaks Test Runner for Java extension in VS Code
  Description: After updating, users see No delegateCommandHandler for vscode.java.test.get.testpath. Points to an extension-version mismatch. URL: Version 1.41.1 breaks Test Runner for Java extension in VS COde redhat-developer/vscode-java#4014

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!

[wenytang-ms]

Hi @M-k-03
please share your extension versions, thanks!

[montematheus50-boop]

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