java.lang.NullPointerException: Passed null to FileOwnerQuery.getOwner(FileObject)
   at org.netbeans.api.project.FileOwnerQuery.getOwner(FileOwnerQuery.java:95)
   at org.netbeans.modules.j2ee.appengine.config.AppEngineModuleConfiguration.<init>(AppEngineModuleConfiguration.java:52)
   at org.netbeans.modules.j2ee.appengine.config.AppEngineModuleConfigurationFactory.create(AppEngineModuleConfigurationFactory.java:32)
   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.openide.util.Mutex.readAccess(Mutex.java:295)
   at org.netbeans.modules.j2ee.deployment.config.ConfigSupportImpl.getModuleConfiguration(ConfigSupportImpl.java:784)
   at org.netbeans.modules.j2ee.deployment.config.ConfigSupportImpl.ensureConfigurationReady(ConfigSupportImpl.java:242)
   at org.netbeans.modules.maven.j2ee.utils.MavenProjectSupport.setServer(MavenProjectSupport.java:175)
   at org.netbeans.modules.maven.j2ee.utils.MavenProjectSupport.assignServer(MavenProjectSupport.java:158)
   at org.netbeans.modules.maven.j2ee.utils.MavenProjectSupport.changeServer(MavenProjectSupport.java:118)
   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:1423)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2033)