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.openide.util.Mutex.readAccess(Mutex.java:290)
   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:160)
   at org.netbeans.modules.maven.j2ee.utils.MavenProjectSupport.assignServer(MavenProjectSupport.java:144)
   at org.netbeans.modules.maven.j2ee.utils.MavenProjectSupport.changeServer(MavenProjectSupport.java:113)
   at org.netbeans.modules.maven.j2ee.ProjectHookImpl.projectOpened(ProjectHookImpl.java:82)
   at org.netbeans.spi.project.ui.ProjectOpenedHook$1.projectOpened(ProjectOpenedHook.java:85)
   at org.netbeans.spi.project.ui.support.UILookupMergerSupport$OpenHookImpl.projectOpened(UILookupMergerSupport.java:248)
   at org.netbeans.spi.project.ui.ProjectOpenedHook$1.projectOpened(ProjectOpenedHook.java:85)
   at org.netbeans.modules.project.ui.OpenProjectList.notifyOpened(OpenProjectList.java:1218)
   at org.netbeans.modules.project.ui.OpenProjectList.doOpenProject(OpenProjectList.java:1299)
   at org.netbeans.modules.project.ui.OpenProjectList.open(OpenProjectList.java:791)
   at org.netbeans.modules.project.ui.OpenProjectList$5.run(OpenProjectList.java:659)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1454)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2048)