Extension keeps building code, never finishing

I’m trying to use the vscode-java extension in VSCode, but it keeps on building the same source code (it seems) again and again, hogging 100% CPU.

I see lines like this in the Task - Java Build Status Terminal: 1e7bf092 Building: 72% Compiling foo/src/test/java/fi/bar/xyzzy/controller [720/1000]. After it completes, it starts again.

I set the “Trace” setting in Settings to “messages”, and saw this in the logs multiple times: [Trace - 9:47:08 AM] Sending notification 'workspace/didChangeWatchedFiles'., followed by a bunch of [Trace - 9:47:08 AM] Received notification 'language/progressReport'.

My guess is that it somehow thinks that some of the watched files have changed. How can I find out which files are causing the build to re-trigger?

Environment

• Operating System: macOS Catalina 10.15.3
• JDK version: jdk1.8.0_161
• Visual Studio Code version: 1.43.2
• Java extension version: 0.58.0

Steps To Reproduce

Unfortunately it only happens in our fairly large proprietary project.

Current Result

Keeps rebuilding the code forever.

Expected Result

Should stop building after a reasonable time.

Additional Informations

[ianmarxent]

I had a similar issue; stuck building and would never finish. I checked out the troubleshooting guide here and found that cleaning out my workspace directory solved the problem for me (steps from link pasted below):

• Open the command palette
• select Java: Clean the Java Language Server Workspace
• select Restart and delete from the confirmation prompt

[snjeza]

@cammarb Could you check https://github.com/redhat-developer/vscode-java/issues/2020#issuecomment-880272712