Java package taking 100% CPU under very specific conditions

[ipkiss42]

Here are the minimal conditions needed to reproduce this issue:

• A Java package has a dependency on Lombok.
• A method uses Lombok's @NonNull on a parameter.
• The first line of the method is a comment.
• The line after the comment is NOT empty.
• The lombok.nonNull.exceptionType = JDK option is set in a lombok.config file.

If you open this project in VS Code with the redhat.java extension, any modification in that same file that does not break the above criteria (such as adding a comment on the last line and saving) will take 100% of one CPU core. Do it 5 times, and it will take 5 cores!

This high CPU usage stops after a while, but it makes the whole machine unresponsive if you make several modifications quickly.

You can use this minimal repo to reproduce the bug: ipkiss42/vscode-java-4052.