java.lang.NullPointerException
   at com.sun.tools.javac.comp.Check.checkImportedPackagesObservable(Check.java:3677)
   at com.sun.tools.javac.comp.TypeEnter.finishImports(TypeEnter.java:235)
   at com.sun.tools.javac.comp.TypeEnter.complete(TypeEnter.java:220)
   at com.sun.tools.javac.code.Symbol.complete(Symbol.java:592)
   at com.sun.tools.javac.code.Symbol$ClassSymbol.complete(Symbol.java:1107)
   at com.sun.tools.javac.comp.Enter.complete(Enter.java:728)
   at com.sun.tools.javac.main.JavaCompiler.readSourceFile(JavaCompiler.java:795)
   at com.sun.tools.javac.main.JavaCompiler.readSourceFile(JavaCompiler.java:756)
   at com.sun.tools.javac.main.JavaCompiler.access$100(JavaCompiler.java:90)
   at com.sun.tools.javac.main.JavaCompiler$1.complete(JavaCompiler.java:324)
   at com.sun.tools.javac.code.ClassFinder.fillIn(ClassFinder.java:365)
   at com.sun.tools.javac.code.ClassFinder.complete(ClassFinder.java:293)
   at com.sun.tools.javac.code.ClassFinder.access$000(ClassFinder.java:75)
   at com.sun.tools.javac.code.ClassFinder$1.complete(ClassFinder.java:169)
   at com.sun.tools.javac.code.Symbol.complete(Symbol.java:592)
   at com.sun.tools.javac.code.Symbol$ClassSymbol.complete(Symbol.java:1107)
   at com.sun.tools.javac.code.ClassFinder.loadClass(ClassFinder.java:418)
   at com.sun.tools.javac.comp.Resolve.loadClass(Resolve.java:1920)
   at com.sun.tools.javac.comp.Resolve.findIdentInPackage(Resolve.java:2157)
   at com.sun.tools.javac.comp.Attr$IdentAttributer.visitMemberSelect(Attr.java:356)
   at com.sun.tools.javac.comp.Attr$IdentAttributer.visitMemberSelect(Attr.java:347)
   at com.sun.tools.javac.tree.JCTree$JCFieldAccess.accept(JCTree.java:2083)
   at com.sun.source.util.SimpleTreeVisitor.visit(SimpleTreeVisitor.java:81)
   at com.sun.tools.javac.comp.Attr$IdentAttributer.visitMemberSelect(Attr.java:350)
   at com.sun.tools.javac.comp.Attr$IdentAttributer.visitMemberSelect(Attr.java:347)
   at com.sun.tools.javac.tree.JCTree$JCFieldAccess.accept(JCTree.java:2083)
   at com.sun.tools.javac.comp.Attr.attribIdent(Attr.java:343)
   at com.sun.tools.javac.main.JavaCompiler.resolveIdent(JavaCompiler.java:697)
   at com.sun.tools.javac.model.JavacElements.nameToSymbol(JavacElements.java:156)
   at com.sun.tools.javac.model.JavacElements.getTypeElement(JavacElements.java:105)
   at com.sun.tools.javac.model.JavacElements.getTypeElement(JavacElements.java:65)
   at org.netbeans.modules.java.j2seproject.MainClassUpdater$5.run(MainClassUpdater.java:278)
   at org.netbeans.modules.java.j2seproject.MainClassUpdater$5.run(MainClassUpdater.java:275)
   at org.netbeans.api.java.source.ScanUtils$TaskWrapper.run(ScanUtils.java:516)
   at org.netbeans.api.java.source.ScanUtils$TaskWrapper.run(ScanUtils.java:472)
   at org.netbeans.modules.java.source.parsing.MimeTask.run(MimeTask.java:83)
   at org.netbeans.modules.parsing.impl.TaskProcessor.callUserTask(TaskProcessor.java:609)
   at org.netbeans.modules.parsing.api.ParserManager$MimeTaskAction.run(ParserManager.java:380)
   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:88)
Caused: org.netbeans.modules.parsing.spi.ParseException
   at org.netbeans.modules.parsing.impl.TaskProcessor.runUserTask(TaskProcessor.java:209)
   at org.netbeans.modules.parsing.impl.RunWhenScanFinishedSupport$1.run(RunWhenScanFinishedSupport.java:86)
   at org.openide.util.lookup.Lookups.executeWith(Lookups.java:304)
   at org.netbeans.modules.parsing.impl.RunWhenScanFinishedSupport.performDeferredTasks(RunWhenScanFinishedSupport.java:80)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Task$2.call(RepositoryUpdater.java:6123)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Task$2.call(RepositoryUpdater.java:6101)
   at org.netbeans.modules.masterfs.filebasedfs.utils.FileChangedManager.priorityIO(FileChangedManager.java:176)
   at org.netbeans.modules.masterfs.providers.ProvidedExtensions.priorityIO(ProvidedExtensions.java:360)
   at org.netbeans.modules.parsing.nb.DataObjectEnvFactory.runPriorityIO(DataObjectEnvFactory.java:141)
   at org.netbeans.modules.parsing.impl.Utilities.runPriorityIO(Utilities.java:88)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Task.run(RepositoryUpdater.java:6101)
   at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
   at java.util.concurrent.FutureTask.run(FutureTask.java:266)
   at org.openide.util.RequestProcessor$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)