I'm working on an Acceleo project, when i generate a maven application, and update its dependencies, I get a pop up window that says: Failed while installing JAX-RS (REST Web Services) 1.1.java.lang.NullPointerException, I'm using Jersey.

Same problem when I try to import it elsewhere.

Any hints? thanks

enter image description here

Error log

!ENTRY org.eclipse.m2e.logback.appender 2 0 2013-05-30 15:02:13.572
!MESSAGE The artifact jta:jta:jar:1.0.1b has been relocated to javax.transaction:jta:jar:1.0.1B

!ENTRY org.eclipse.m2e.logback.appender 2 0 2013-05-30 15:02:13.807
!MESSAGE The artifact jta:jta:jar:1.0.1b has been relocated to javax.transaction:jta:jar:1.0.1B

!ENTRY org.eclipse.wst.common.project.facet.core 4 0 2013-05-30 15:02:14.479
!MESSAGE Failed while installing JAX-RS (REST Web Services) 1.1.
!STACK 0
java.lang.NullPointerException
    at org.eclipse.jst.jee.model.internal.common.AbstractMergedModelProvider.getLastModificationTimeOfDDFile(AbstractMergedModelProvider.java:235)
    at org.eclipse.jst.jee.model.internal.common.AbstractMergedModelProvider.hasToReloadModel(AbstractMergedModelProvider.java:229)
    at org.eclipse.jst.jee.model.internal.common.AbstractMergedModelProvider.loadProviders(AbstractMergedModelProvider.java:256)
    at org.eclipse.jst.jee.model.internal.common.AbstractMergedModelProvider.access$2(AbstractMergedModelProvider.java:255)
    at org.eclipse.jst.jee.model.internal.common.AbstractMergedModelProvider$LoadModelsWorkspaceRunnable.run(AbstractMergedModelProvider.java:278)
    at org.eclipse.core.internal.resources.Workspace.run(Workspace.java:2344)
    at org.eclipse.jst.jee.model.internal.common.AbstractMergedModelProvider.loadModel(AbstractMergedModelProvider.java:249)
    at org.eclipse.jst.jee.model.internal.common.AbstractMergedModelProvider.getMergedModel(AbstractMergedModelProvider.java:219)
    at org.eclip
java web-services rest
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