I am unable to get any content assistance in my xhtml pages, and I believe it is related to the error I get when building the project: Platform: Eclipse Java EE Version: Kepler Service Release 1 Build id: 20130919-8019 JBoss Tools: I am not sure which plugin versions are useful but here are some important looking ones: JBoss AS Core Plug-in - 2.4.100.Final-v20130717-0846-B106 JBoss Tools Common - 3.5.1.Final-v20130717-0450-B102 Application Server Interface Core Plug-in - 2.4.100.Final-v20130717-0846-B106 Context and Dependency Injection Core - 1.5.0.Final-v20130717-0417-B93 El Plug-in - 3.5.1.Final-v20130717-0450-B102 A popup appears that says: ---------------------------------------------------------------------------------------------------------------- Problem Occured 'Building workspace' has encountered a problem. Errors occured during the build. Details: Errors occurred during the build. Errors running builder 'JBoss Knowledge Base Builder' on project 'Web-2.23'. java.lang.NullPointerException ---------------------------------------------------------------------------------------------------------------- Stacktrace: !ENTRY org.eclipse.core.resources 4 75 2013-12-03 15:24:15.443 !MESSAGE Errors occurred during the build. !SUBENTRY 1 org.jboss.tools.jst.web.kb 4 75 2013-12-03 15:24:15.443 !MESSAGE Errors running builder 'JBoss Knowledge Base Builder' on project 'Web-2.23'. !STACK 0 java.lang.NullPointerException         at org.eclipse.wst.common.componentcore.internal.resources.VirtualResource.getProjectRelativePaths(VirtualResource.java:119)         at org.eclipse.wst.common.componentcore.internal.resources.VirtualResource.getProjectRelativePath(VirtualResource.java:154)         at org.eclipse.wst.common.componentcore.internal.resources.VirtualResource.getWorkspaceRelativePath(VirtualResource.java:109)         at org.jboss.tools.jst.web.model.helpers.InnerModelHelper.getWebInfPath(InnerModelHelper.java:91)         at org.jboss.tools.jst.web.model.helpers.InnerModelHelper.createXModel(InnerModelHelper.java:46)         at org.jboss.tools.jst.web.kb.internal.scanner.ClassPathMonitor.init(ClassPathMonitor.java:60)         at org.jboss.tools.jst.web.kb.internal.KbProject.setProject(KbProject.java:202)         at org.eclipse.core.internal.resources.NatureManager.createNature(NatureManager.java:233)         at org.eclipse.core.internal.resources.Project.getNature(Project.java:448)         at org.jboss.tools.jst.web.kb.KbProjectFactory.getKbProject(KbProjectFactory.java:67)         at org.jboss.tools.jst.web.kb.KbProjectFactory.getKbProject(KbProjectFactory.java:34)         at org.jboss.tools.jst.web.kb.internal.scanner.ClassPathMonitor.getKbProjects(ClassPathMonitor.java:201)         at org.jboss.tools.jst.web.kb.internal.scanner.ClassPathMonitor.hasToUpdateProjectDependencies(ClassPathMonitor.java:166)         at org.jboss.tools.jst.web.kb.internal.scanner.ClassPathMonitor.build(ClassPathMonitor.java:214)         at org.jboss.tools.jst.web.kb.internal.KbBuilder.build(KbBuilder.java:102)         at org.eclipse.core.internal.events.BuildManager$2.run(BuildManager.java:733)         at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)         at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:206)         at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:246)         at org.eclipse.core.internal.events.BuildManager$1.run(BuildManager.java:299)         at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)         at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:302)         at org.eclipse.core.internal.events.BuildManager.basicBuildLoop(BuildManager.java:358)         at org.eclipse.core.internal.events.BuildManager.build(BuildManager.java:381)         at org.eclipse.core.internal.events.AutoBuildJob.doBuild(AutoBuildJob.java:143)         at org.eclipse.core.internal.events.AutoBuildJob.run(AutoBuildJob.java:241)         at org.eclipse.core.internal.jobs.Worker.run(Worker.java:53) Posted by forums Original post: https://community.jboss.org/message/848128#848128