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

Upgrading from Kepler to Luna worked for me.

I had just added some components for Java 1.8 support. It seems that they where not as compatible as I would like or that I mixed the wrong ones. It really caused a lot of problems. Trying to update the system reported errors as they couldn't fulfill some dependencies. Maven upgrades didn't work. Tried a lot of things.

So, if there is no reason to avoid the upgrade just add the luna repository to avalilable software sites (Luna http://download.eclipse.org/releases/luna/ ) and "check for updates". It is better to have all the components with the same version and there are some nice new features.

Answer 2

Try mvn clean install eclipse:eclipse -Dwtpversion=2.0 command on DOS command prompt. Suggesting you because , It worked for me!!

Answer 3

This error is also thrown if the update command is used on a project instrumented for code coverage with Clover.

To resolve in this scenario: Un-instrument the project folders you wish to update. Run the maven update then instrument for code coverage again.

Answer 4

Have you tried:

1. If you have import project into the eclipse 4, please delete it.
2. In maven consol, run: mvn eclipse:clean
3. In Eclipse 4: File -> Import -> Maven -> Existing Maven Projects

Answer 5

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.

Answer 6

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.