java.lang.NullPointerException at com.sun.tools.javac.comp.Check.checkImportedPackagesObservable(Check.java:3664) at com.sun.tools.javac.comp.TypeEnter.finishImports(TypeEnter.java:237) at com.sun.tools.javac.comp.TypeEnter.complete(TypeEnter.java:222) at com.sun.tools.javac.code.Symbol.complete(Symbol.java:604) at com.sun.tools.javac.code.Symbol$ClassSymbol.complete(Symbol.java:1237) at com.sun.tools.javac.comp.Enter.complete(Enter.java:779) at com.sun.tools.javac.main.JavaCompiler.readSourceFile(JavaCompiler.java:851) at com.sun.tools.javac.main.JavaCompiler.readSourceFile(JavaCompiler.java:802) at com.sun.tools.javac.main.JavaCompiler.access$100(JavaCompiler.java:99) at com.sun.tools.javac.main.JavaCompiler$1.complete(JavaCompiler.java:345) at com.sun.tools.javac.code.ClassFinder.fillIn(ClassFinder.java:373) at com.sun.tools.javac.code.ClassFinder.complete(ClassFinder.java:301) at com.sun.tools.javac.code.ClassFinder.access$000(ClassFinder.java:76) at com.sun.tools.javac.code.ClassFinder$1.complete(ClassFinder.java:174) at com.sun.tools.javac.code.Symbol.complete(Symbol.java:604) at com.sun.tools.javac.code.Symbol$ClassSymbol.complete(Symbol.java:1237) at com.sun.tools.javac.code.Type$ClassType.complete(Type.java:1156) at com.sun.tools.javac.code.Type$ClassType.getTypeArguments(Type.java:1077) at com.sun.tools.javac.code.Type$ClassType.isErroneous(Type.java:1112) at com.sun.tools.javac.comp.Resolve.findGlobalType(Resolve.java:2093) at com.sun.tools.javac.comp.Resolve.findType(Resolve.java:2168) at com.sun.tools.javac.comp.Resolve.findIdent(Resolve.java:2197) at com.sun.tools.javac.comp.Resolve.resolveIdent(Resolve.java:2424) at com.sun.tools.javac.comp.Attr.visitIdent(Attr.java:3509) at com.sun.tools.javac.tree.JCTree$JCIdent.accept(JCTree.java:2210) at com.sun.tools.javac.comp.Attr$ResultInfo.attr(Attr.java:499) at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:640) at com.sun.tools.javac.comp.Attr.attribType(Attr.java:699) at com.sun.tools.javac.comp.Attr.attribType(Attr.java:692) at com.sun.tools.javac.comp.MemberEnter.visitVarDef(MemberEnter.java:416) at com.sun.tools.javadoc.JavadocMemberEnter.visitVarDef(JavadocMemberEnter.java:86) at org.netbeans.lib.nbjavac.services.NBJavadocMemberEnter.visitVarDef(NBJavadocMemberEnter.java:90) at com.sun.tools.javac.tree.JCTree$JCVariableDecl.accept(JCTree.java:942) at com.sun.tools.javac.comp.MemberEnter.memberEnter(MemberEnter.java:175) at com.sun.tools.javac.comp.Attr.visitVarDef(Attr.java:1127) at com.sun.tools.javac.tree.JCTree$JCVariableDecl.accept(JCTree.java:942) at com.sun.tools.javac.comp.Attr$ResultInfo.attr(Attr.java:499) at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:640) at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:710) at com.sun.tools.javac.comp.Attr.attribStats(Attr.java:734) at com.sun.tools.javac.comp.Attr.visitBlock(Attr.java:1221) at org.netbeans.lib.nbjavac.services.NBAttr.visitBlock(NBAttr.java:82) at com.sun.tools.javac.tree.JCTree$JCBlock.accept(JCTree.java:1006) at com.sun.tools.javac.comp.Attr$ResultInfo.attr(Attr.java:499) at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:640) at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:710) at com.sun.tools.javac.comp.Attr.visitMethodDef(Attr.java:1107) at org.netbeans.lib.nbjavac.services.NBAttr.visitMethodDef(NBAttr.java:76) at com.sun.tools.javac.tree.JCTree$JCMethodDecl.accept(JCTree.java:858) at com.sun.tools.javac.comp.Attr$ResultInfo.attr(Attr.java:499) at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:640) at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:710) at com.sun.tools.javac.comp.Attr.attribClassBody(Attr.java:4718) at com.sun.tools.javac.comp.Attr.attribClass(Attr.java:4614) at com.sun.tools.javac.comp.Attr.attribClass(Attr.java:4542) at com.sun.tools.javac.api.JavacTrees.getElement(JavacTrees.java:428) at com.sun.tools.javac.api.JavacTrees.getElement(JavacTrees.java:164) at org.netbeans.api.java.source.TreePathHandle.create(TreePathHandle.java:248) at org.netbeans.modules.java.navigation.BreadCrumbsNodeImpl.createBreadcrumbs(BreadCrumbsNodeImpl.java:206) at org.netbeans.modules.java.navigation.BreadCrumbsNodeImpl$3$1.scan(BreadCrumbsNodeImpl.java:492) at org.netbeans.modules.java.navigation.BreadCrumbsNodeImpl$3$1.scan(BreadCrumbsNodeImpl.java:471) at com.sun.source.util.TreeScanner.scan(TreeScanner.java:105) at com.sun.source.util.TreeScanner.visitLambdaExpression(TreeScanner.java:558) at com.sun.tools.javac.tree.JCTree$JCLambda.accept(JCTree.java:1797) at com.sun.source.util.TreeScanner.scan(TreeScanner.java:86) at org.netbeans.modules.java.navigation.BreadCrumbsNodeImpl$3$1.scan(BreadCrumbsNodeImpl.java:496) at org.netbeans.modules.java.navigation.BreadCrumbsNodeImpl$3$1.scan(BreadCrumbsNodeImpl.java:471) at com.sun.source.util.TreeScanner.scan(TreeScanner.java:105) at com.sun.source.util.TreeScanner.scanAndReduce(TreeScanner.java:113) at com.sun.source.util.TreeScanner.visitMethodInvocation(TreeScanner.java:509) at com.sun.tools.javac.tree.JCTree$JCMethodInvocation.accept(JCTree.java:1636) at com.sun.source.util.TreeScanner.scan(TreeScanner.java:86) at org.netbeans.modules.java.navigation.BreadCrumbsNodeImpl$3$1.scan(BreadCrumbsNodeImpl.java:496) at org.netbeans.modules.java.navigation.BreadCrumbsNodeImpl$3$1.scan(BreadCrumbsNodeImpl.java:471) at com.sun.source.util.TreeScanner.visitExpressionStatement(TreeScanner.java:433) at com.sun.tools.javac.tree.JCTree$JCExpressionStatement.accept(JCTree.java:1446) at com.sun.source.util.TreeScanner.scan(TreeScanner.java:86) at org.netbeans.modules.java.navigation.BreadCrumbsNodeImpl$3$1.scan(BreadCrumbsNodeImpl.java:496) at org.netbeans.modules.java.navigation.BreadCrumbsNodeImpl$3$1.scan(BreadCrumbsNodeImpl.java:471) at com.sun.source.util.TreeScanner.scan(TreeScanner.java:105) at com.sun.source.util.TreeScanner.visitBlock(TreeScanner.java:248) at com.sun.tools.javac.tree.JCTree$JCBlock.accept(JCTree.java:1018) at com.sun.source.util.TreeScanner.scan(TreeScanner.java:86) at org.netbeans.modules.java.navigation.BreadCrumbsNodeImpl$3$1.scan(BreadCrumbsNodeImpl.java:496) at org.netbeans.modules.java.navigation.BreadCrumbsNodeImpl$3$1.visitMethod(BreadCrumbsNodeImpl.java:501) at org.netbeans.modules.java.navigation.BreadCrumbsNodeImpl$3$1.visitMethod(BreadCrumbsNodeImpl.java:471) at com.sun.tools.javac.tree.JCTree$JCMethodDecl.accept(JCTree.java:890) at org.netbeans.modules.java.navigation.BreadCrumbsNodeImpl$3.run(BreadCrumbsNodeImpl.java:471) at org.netbeans.modules.java.navigation.BreadCrumbsNodeImpl$3.run(BreadCrumbsNodeImpl.java:460) at org.netbeans.api.java.source.JavaSource$MultiTask.run(JavaSource.java:518) at org.netbeans.modules.parsing.impl.TaskProcessor.callUserTask(TaskProcessor.java:609) at org.netbeans.modules.parsing.api.ParserManager$UserTaskAction.run(ParserManager.java:153) at org.netbeans.modules.parsing.api.ParserManager$UserTaskAction.run(ParserManager.java:137) at org.netbeans.modules.parsing.impl.TaskProcessor$2.call(TaskProcessor.java:204) at org.netbeans.modules.parsing.impl.TaskProcessor$2.call(TaskProcessor.java:201) at org.netbeans.modules.masterfs.filebasedfs.utils.FileChangedManager.priorityIO(FileChangedManager.java:176) at org.netbeans.modules.masterfs.providers.ProvidedExtensions.priorityIO(ProvidedExtensions.java:360) at org.netbeans.modules.parsing.nb.DataObjectEnvFactory.runPriorityIO(DataObjectEnvFactory.java:141) at org.netbeans.modules.parsing.impl.Utilities.runPriorityIO(Utilities.java:90) at org.netbeans.modules.parsing.impl.TaskProcessor.runUserTask(TaskProcessor.java:201) at org.netbeans.modules.parsing.api.ParserManager.parse(ParserManager.java:104) at org.netbeans.api.java.source.JavaSource.runUserActionTaskImpl(JavaSource.java:468) at org.netbeans.api.java.source.JavaSource.runUserActionTask(JavaSource.java:439) at org.netbeans.modules.java.navigation.BreadCrumbsNodeImpl.getChildren(BreadCrumbsNodeImpl.java:460) at org.netbeans.modules.java.navigation.BreadCrumbsScanningTask.rootAndSelection(BreadCrumbsScanningTask.java:137) at org.netbeans.modules.java.navigation.BreadCrumbsScanningTask.run(BreadCrumbsScanningTask.java:105) at org.netbeans.modules.parsing.impl.TaskProcessor.callParserResultTask(TaskProcessor.java:584) at org.netbeans.modules.parsing.impl.TaskProcessor$RequestPerformer.run(TaskProcessor.java:809) at org.openide.util.lookup.Lookups.executeWith(Lookups.java:304) at org.netbeans.modules.parsing.impl.TaskProcessor$RequestPerformer.execute(TaskProcessor.java:725) at org.netbeans.modules.parsing.impl.TaskProcessor$CompilationJob.run(TaskProcessor.java:686) 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)