How to fix error “Updating Maven Project”. Unsupported IClasspathEntry kind=4?

Question

I have imported maven project in STS, when I run update update project I receive:

\"Updating Maven Project\". Unsupported IClasspathEntry kind=4

Answer 1

I'm using Eclipse 4.3.2 (Kepler) with M2E 1.4.x and felt over this problem several times!

In my case the "mvn eclipse:eclipse" command also generates Checkstyle, PMD and Findbugs configuration so "mvn eclipse:clean" does not help me because it drops all those config files again.

The best solution for me was to delete all ".classpath" files:

find . -name ".classpath" -delete

and import the project into eclipse afterwards.