error in validation of project in eclipse - clean

Question

Since I updated my osx version this morning (no other changes) I get cleaning my project in eclipse:

Errors occurred during the build.
Errors running builder 'Validation' on project 'XXXXX'.
java.lang.NullPointerException

and the same result trying to run maven=> update project.

my configuration:

Apache Maven 3.2.1 (ea8b2b07643dbb1b84b6d16e1f08391b666bc1e9; 2014-02-14T18:37:52+01:00)
Maven home: /usr/local/Cellar/maven/3.2.1
Java version: 1.6.0_65, vendor: Apple Inc.
Java home: /System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Home
Default locale: nl_NL, platform encoding: MacRoman
OS name: "mac os x", version: "10.9.3", arch: "x86_64", family: "mac"

All suggestions are welcome!

Solution 1

Errors occurred during the build. Errors running builder 'Validation' on project 'XXXXX'. java.lang.NullPointerException

A very general error that can arise due to a number of issues in settings and configurations. The most easy way out is to delete the project from eclipse, remove the directory .metadata from your workspace folder and then re-import the project ( or projects ).

Also try to check that the classpath of the eclipse is configured properly and no class-path variable has gotten disturbed during OS upgrade. Best way to check this is to goto the Configure classpath options of your project and make sure there isn't any issue there

Solution 2

Just removing folder [workspace].metadata.plugins\org.eclipse.wst.validation and restarting eclipse solved the problem for me

Comments

[Arthur Nederlof]

Reloaded the project out of git after completely erasing the local instance. Gave the same result unfortunately.

[Saif Asif]

You didnt have to do that. I just said to delete it from within eclipse ( not to delete files from system ) and then re-import it in a fresh workspace. Did you re-create the workspace as well?

[Arthur Nederlof]

Removing the .metadata and the project .setup file, and importing all projects again did solve the problem. Thanks a lot!

[Saif Asif]

Glad it helped. Dont forget to upvote/accept the answer