java.lang.NullPointerException
   at org.netbeans.modules.j2ee.deployment.config.ConfigSupportImpl$1.run(ConfigSupportImpl.java:805)
   at org.netbeans.modules.j2ee.deployment.config.ConfigSupportImpl$1.run(ConfigSupportImpl.java:784)
   at org.netbeans.modules.openide.util.DefaultMutexImplementation.readAccess(DefaultMutexImplementation.java:252)
   at org.openide.util.Mutex.readAccess(Mutex.java:218)
   at org.netbeans.modules.j2ee.deployment.config.ConfigSupportImpl.getModuleConfiguration(ConfigSupportImpl.java:784)
   at org.netbeans.modules.j2ee.deployment.config.ConfigSupportImpl.getServerLibraryConfiguration(ConfigSupportImpl.java:839)
   at org.netbeans.modules.j2ee.deployment.config.ConfigSupportImpl.getLibraries(ConfigSupportImpl.java:360)
   at org.netbeans.modules.j2ee.common.ui.BrokenServerLibrarySupport.getDependencies(BrokenServerLibrarySupport.java:193)
   at org.netbeans.modules.j2ee.common.ui.BrokenServerLibrarySupport.getMissingServerLibraries(BrokenServerLibrarySupport.java:153)
   at org.netbeans.modules.maven.j2ee.utils.MavenProjectSupport.changeServer(MavenProjectSupport.java:140)
   at org.netbeans.modules.maven.j2ee.ProjectHookImpl.projectOpened(ProjectHookImpl.java:98)
   at org.netbeans.spi.project.ui.ProjectOpenedHook$1.projectOpened(ProjectOpenedHook.java:85)
   at org.netbeans.modules.project.ui.OpenProjectList.notifyOpened(OpenProjectList.java:1298)
   at org.netbeans.modules.project.ui.OpenProjectList.doOpenProject(OpenProjectList.java:1379)
   at org.netbeans.modules.project.ui.OpenProjectList.open(OpenProjectList.java:823)
   at org.netbeans.modules.project.ui.OpenProjectList$6.run(OpenProjectList.java:675)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1443)
   at org.netbeans.modules.openide.util.GlobalLookup.execute(GlobalLookup.java:68)
   at org.openide.util.lookup.Lookups.executeWith(Lookups.java:303)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2058)