java.lang.IllegalArgumentException: Project is not a Gradle build server project: demo

[milic-marko]

When I try to run the test with delegate to gradle I get this exception.

[Error - 8:27:10 PM] Apr 26, 2026, 8:27:10 PM Error in calling delegate command handler
java.lang.IllegalArgumentException: Project is not a Gradle build server project: demo
	at com.microsoft.gradle.bs.importer.handler.GradleDelegateCommandHandler.executeCommand(GradleDelegateCommandHandler.java:40)
	at org.eclipse.jdt.ls.core.internal.handlers.WorkspaceExecuteCommandHandler$1.run(WorkspaceExecuteCommandHandler.java:230)
	at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:47)
	at org.eclipse.jdt.ls.core.internal.handlers.WorkspaceExecuteCommandHandler.executeCommand(WorkspaceExecuteCommandHandler.java:220)
	at org.eclipse.jdt.ls.core.internal.handlers.JDTLanguageServer.lambda$4(JDTLanguageServer.java:639)
	at org.eclipse.jdt.ls.core.internal.BaseJDTLanguageServer.lambda$0(BaseJDTLanguageServer.java:87)
	at java.base/java.util.concurrent.CompletableFuture$UniApply.tryFire(CompletableFuture.java:667)
	at java.base/java.util.concurrent.CompletableFuture$Completion.exec(CompletableFuture.java:504)
	at java.base/java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:511)
	at java.base/java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1450)
	at java.base/java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:2019)
	at java.base/java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:187)

[github-actions]

Hi @milic-marko, 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.

The error “Project is not a Gradle build server project: demo” indicates the Java language server isn’t recognizing your folder as a Gradle‐imported build. To resolve:

• Run Java: Clean Java Language Server Workspace from the Command Palette and reload VS Code
  Cannot see Delegate Test to Gradle option in VS Code vscode-gradle#1606 (comment)

• Ensure you’ve opened the Gradle root (the folder with settings.gradle or build.gradle) and then use Gradle: Refresh All in the Gradle sidebar so that the build server importer picks it up.

This is a known issue:

• Duplicate of When project is imported by Buildship, give a clear message what to do to use test delegation #1726

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!