How to resolve eclipse errors for java 11 project

I have migrated to java11 from 8. When I have imported project to eclipse, I see more than 1300 errors. Please check screenshot.

Error types are Language servers, Annotations problems, Java problems etc

I have made necessary configuration changes to eclipse e.g. setting java11 pref, default jre. Project is maven and i can see it has linked all maven dependencies.
I am not sure why it is still coming.

Eclipse is eclipse-jee-2023-09-R-win32-x86_64

Please comment if you faced this problem.