I just tried Eclipse Kepler RC1 and JBoss Tools from http://download.jboss.org/jbosstools/builds/development/4.1.0.Beta1b.core/2013-05-29_02-05-21-B272/all/jbosstools-build-sites.aggregate.site_41-Update-2013-05-29_02-05-21-B272.zip . However, after doing a "Maven > Update Project", then I'm getting this stacktrace followed by a broken workspace. Broken means that when I restart Eclipse to use this workspace, then it crashes.
!ENTRY org.eclipse.core.jobs 4 2 2013-05-30 17:33:24.997
!MESSAGE An internal error occurred during: "Updating Maven Project".
!STACK 0
javax.xml.parsers.FactoryConfigurationError: Provider __redirected.__DocumentBuilderFactory not found
at javax.xml.parsers.DocumentBuilderFactory.newInstance(DocumentBuilderFactory.java:127)
at org.eclipse.jdt.internal.core.JavaProject.decodeClasspath(JavaProject.java:912)
at org.eclipse.jdt.internal.core.JavaProject.readFileEntriesWithException(JavaProject.java:2497)
at org.eclipse.jdt.internal.core.JavaModelManager$PerProjectInfo.readAndCacheClasspath(JavaModelManager.java:1256)
at org.eclipse.jdt.internal.core.DeltaProcessor.readRawClasspath(DeltaProcessor.java:556)
at org.eclipse.jdt.internal.core.DeltaProcessor.checkProjectsAndClasspathChanges(DeltaProcessor.java:522)
at org.eclipse.jdt.internal.core.DeltaProcessor.checkProjectsAndClasspathChanges(DeltaProcessor.java:536)
at org.eclipse.jdt.internal.core.DeltaProcessor.checkProjectsAndClasspathChanges(DeltaProcessor.java:536)
at org.eclipse.jdt.internal.core.DeltaProcessor.resourceChanged(DeltaProcessor.java:2037)
at org.eclipse.jdt.internal.core.DeltaProcessingState.resourceChanged(DeltaProcessingState.java:470)
at org.eclipse.core.internal.events.NotificationManager$1.run(NotificationManager.java:291)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
at org.eclipse.core.internal.events.NotificationManager.notify(NotificationManager.java:285)
at org.eclipse.core.internal.events.NotificationManager.broadcastChanges(NotificationManager.java:149)
at org.eclipse.core.internal.resources.Workspace.broadcastPostChange(Workspace.java:396)
at org.eclipse.core.internal.resources.Workspace.endOperation(Workspace.java:1531)
at org.eclipse.core.internal.resources.InternalWorkspaceJob.run(InternalWorkspaceJob.java:45)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:53)
Caused by: java.lang.ClassNotFoundException: __redirected/__DocumentBuilderFactory
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:266)
at javax.xml.parsers.FactoryFinder.getProviderClass(FactoryFinder.java:123)
at javax.xml.parsers.FactoryFinder.newInstance(FactoryFinder.java:178)
at javax.xml.parsers.FactoryFinder.newInstance(FactoryFinder.java:147)
at javax.xml.parsers.FactoryFinder.find(FactoryFinder.java:219)
at javax.xml.parsers.DocumentBuilderFactory.newInstance(DocumentBuilderFactory.java:121)
... 17 more