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 tried Marco's steps but no luck. Instead if you just get the latest m2e plugin from the link he provides and one by one right click on each project -> Maven -> Update Dependencies the error still pops up but the issue is resolved. That is to say the warnings disappear in the Markers view. I encountered this issue after importing some projects into SpringSource Tool Suite (STS). When I returned to my Eclipse Juno installation the warnings were displaying. Seeing that I had m2e 1.1 already installed I tried Marco's steps to no avail. Getting the latest version fixed it however.