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

Seeing all other answers. I found for me a simpler way.

I just removed all lines in the .classpath (editing with eclipse) containing a var and used maven -> update project without an error.