java.lang.NullPointerException
   at java.util.Collections$UnmodifiableCollection.<init>(Collections.java:1026)
   at java.util.Collections$UnmodifiableList.<init>(Collections.java:1302)
   at java.util.Collections.unmodifiableList(Collections.java:1287)
   at com.sun.tools.javac.code.Symbol$ModuleSymbol.getDirectives(Symbol.java:946)
   at org.netbeans.modules.java.api.common.classpath.ModuleClassPaths$ModuleInfoClassPathImplementation.dependsOnUnnamed(ModuleClassPaths.java:1016)
   at org.netbeans.modules.java.api.common.classpath.ModuleClassPaths$ModuleInfoClassPathImplementation.dependsOnUnnamed(ModuleClassPaths.java:1004)
   at org.netbeans.modules.java.api.common.classpath.ModuleClassPaths$ModuleInfoClassPathImplementation.getResources(ModuleClassPaths.java:672)
   at org.netbeans.api.java.classpath.ClassPath.entries(ClassPath.java:372)
   at org.netbeans.spi.java.classpath.support.MuxClassPathImplementation.getResources(MuxClassPathImplementation.java:102)
   at org.netbeans.api.java.classpath.ClassPath.entries(ClassPath.java:372)
   at org.netbeans.spi.java.project.support.ClassPathProviderMerger$ProxyFilteringCPI.getRoots(ClassPathProviderMerger.java:276)
   at org.netbeans.api.java.classpath.ClassPath.entries(ClassPath.java:380)
   at org.netbeans.api.java.source.ClasspathInfo.toURIs(ClasspathInfo.java:567)
   at org.netbeans.api.java.source.ClasspathInfo.equals(ClasspathInfo.java:244)
   at org.netbeans.modules.java.source.parsing.JavacParser.getResult(JavacParser.java:471)
   at org.netbeans.modules.java.source.parsing.JavacParser.getResult(JavacParser.java:167)
   at org.netbeans.modules.parsing.impl.TaskProcessor.callGetResult(TaskProcessor.java:631)
   at org.netbeans.modules.parsing.api.ParserManager$MimeTaskAction.run(ParserManager.java:378)
   at org.netbeans.modules.parsing.api.ParserManager$MimeTaskAction.run(ParserManager.java:363)
   at org.netbeans.modules.parsing.impl.TaskProcessor$2.call(TaskProcessor.java:204)
   at org.netbeans.modules.parsing.impl.TaskProcessor$2.call(TaskProcessor.java:201)
   at org.netbeans.modules.masterfs.filebasedfs.utils.FileChangedManager.priorityIO(FileChangedManager.java:176)
   at org.netbeans.modules.masterfs.providers.ProvidedExtensions.priorityIO(ProvidedExtensions.java:360)
   at org.netbeans.modules.parsing.nb.DataObjectEnvFactory.runPriorityIO(DataObjectEnvFactory.java:141)
   at org.netbeans.modules.parsing.impl.Utilities.runPriorityIO(Utilities.java:90)
   at org.netbeans.modules.parsing.impl.TaskProcessor.runUserTask(TaskProcessor.java:201)
   at org.netbeans.modules.parsing.api.ParserManager.parse(ParserManager.java:334)
   at org.netbeans.api.java.source.JavaSource.runUserActionTaskImpl(JavaSource.java:447)
   at org.netbeans.api.java.source.JavaSource.runUserActionTask(JavaSource.java:439)
   at org.netbeans.api.java.source.SourceUtils.isMainClass(SourceUtils.java:927)
   at org.netbeans.api.java.source.SourceUtils.isMainClass(SourceUtils.java:877)
   at org.netbeans.modules.java.api.common.util.CommonProjectUtils.isMainClass(CommonProjectUtils.java:178)
   at org.netbeans.modules.java.api.common.project.BaseActionProvider.getProjectMainClass(BaseActionProvider.java:1220)
   at org.netbeans.modules.java.api.common.project.BaseActionProvider.getTargetNames(BaseActionProvider.java:893)
   at org.netbeans.modules.java.j2seproject.J2SEActionProvider.getTargetNames(J2SEActionProvider.java:263)
   at org.netbeans.modules.java.api.common.project.BaseActionProvider$1Action.doRun(BaseActionProvider.java:494)
   at org.netbeans.modules.java.api.common.project.BaseActionProvider$1Action.run(BaseActionProvider.java:471)
   at org.netbeans.api.java.source.ui.ScanDialog.runWhenScanFinished(ScanDialog.java:145)
   at org.netbeans.modules.java.api.common.project.BaseActionProvider.invokeAction(BaseActionProvider.java:677)
   at org.netbeans.spi.project.support.LookupProviderSupport$MergedActionProvider.invokeAction(LookupProviderSupport.java:287)
   at org.netbeans.modules.project.ui.actions.ProjectAction$2.run(ProjectAction.java:187)
   at org.netbeans.modules.openide.util.NbMutexEventProvider$Event.doEvent(NbMutexEventProvider.java:118)
   at org.netbeans.modules.openide.util.NbMutexEventProvider$Event.writeAccess(NbMutexEventProvider.java:83)
   at org.netbeans.modules.openide.util.LazyMutexImplementation.writeAccess(LazyMutexImplementation.java:79)
   at org.openide.util.Mutex.writeAccess(Mutex.java:310)
   at org.netbeans.modules.project.ui.actions.ProjectAction.runSequentially(ProjectAction.java:184)
   at org.netbeans.modules.project.ui.actions.MainProjectAction$1$1.run(MainProjectAction.java:140)
   at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:311)
   at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:756)
   at java.awt.EventQueue.access$500(EventQueue.java:97)
   at java.awt.EventQueue$3.run(EventQueue.java:709)
   at java.awt.EventQueue$3.run(EventQueue.java:703)
   at java.security.AccessController.doPrivileged(AccessController.java:0)
   at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)
   at java.awt.EventQueue.dispatchEvent(EventQueue.java:726)
   at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:159)
   at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
   at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
   at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
   at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)