java.lang.NullPointerException
   at com.sun.tools.javac.code.Types$SameTypeVisitor.visitClassType(Types.java:1136)
   at com.sun.tools.javac.code.Types$SameTypeVisitor.visitClassType(Types.java:1089)
   at com.sun.tools.javac.code.Type$ClassType.accept(Type.java:999)
   at com.sun.tools.javac.code.Types$DefaultTypeVisitor.visit(Types.java:4533)
   at com.sun.tools.javac.code.Types.isSameType(Types.java:1086)
   at com.sun.tools.javac.code.Types.isSameType(Types.java:1081)
   at com.sun.tools.javac.comp.Analyzer$DiamondInitializer.process(Analyzer.java:248)
   at com.sun.tools.javac.comp.Analyzer$DiamondInitializer.process(Analyzer.java:211)
   at com.sun.tools.javac.comp.Analyzer.lambda$analyze$74(Analyzer.java:383)
   at java.util.HashMap$EntrySet.forEach(HashMap.java:1035)
   at com.sun.tools.javac.comp.Analyzer.analyze(Analyzer.java:381)
   at com.sun.tools.javac.comp.Analyzer.analyzeIfNeeded(Analyzer.java:353)
   at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:706)
   at com.sun.tools.javac.comp.Attr.attribStats(Attr.java:723)
   at com.sun.tools.javac.comp.Attr.visitBlock(Attr.java:1205)
   at org.netbeans.lib.nbjavac.services.NBAttr.visitBlock(NBAttr.java:82)
   at com.sun.tools.javac.tree.JCTree$JCBlock.accept(JCTree.java:990)
   at com.sun.tools.javac.comp.Attr$ResultInfo.attr(Attr.java:494)
   at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:635)
   at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:704)
   at com.sun.tools.javac.comp.Attr.visitTry(Attr.java:1441)
   at com.sun.tools.javac.tree.JCTree$JCTry.accept(JCTree.java:1284)
   at com.sun.tools.javac.comp.Attr$ResultInfo.attr(Attr.java:494)
   at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:635)
   at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:704)
   at com.sun.tools.javac.comp.Attr.attribStats(Attr.java:723)
   at com.sun.tools.javac.comp.Attr.visitBlock(Attr.java:1205)
   at org.netbeans.lib.nbjavac.services.NBAttr.visitBlock(NBAttr.java:82)
   at com.sun.tools.javac.tree.JCTree$JCBlock.accept(JCTree.java:990)
   at com.sun.tools.javac.comp.Attr$ResultInfo.attr(Attr.java:494)
   at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:635)
   at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:704)
   at com.sun.tools.javac.comp.Attr.visitSynchronized(Attr.java:1401)
   at com.sun.tools.javac.tree.JCTree$JCSynchronized.accept(JCTree.java:1247)
   at com.sun.tools.javac.comp.Attr$ResultInfo.attr(Attr.java:494)
   at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:635)
   at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:704)
   at com.sun.tools.javac.comp.Attr.attribStats(Attr.java:723)
   at com.sun.tools.javac.comp.Attr.visitBlock(Attr.java:1205)
   at org.netbeans.lib.nbjavac.services.NBAttr.visitBlock(NBAttr.java:82)
   at com.sun.tools.javac.tree.JCTree$JCBlock.accept(JCTree.java:990)
   at com.sun.tools.javac.comp.Attr$ResultInfo.attr(Attr.java:494)
   at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:635)
   at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:704)
   at com.sun.tools.javac.comp.Attr.attribStatToTree(Attr.java:412)
   at com.sun.tools.javac.api.JavacTrees.attribStatToTree(JavacTrees.java:975)
   at com.sun.tools.javac.api.JavacTrees.getAttrContext(JavacTrees.java:935)
   at com.sun.tools.javac.api.JavacTrees.getScope(JavacTrees.java:794)
   at com.sun.tools.javac.api.JavacTrees.getScope(JavacTrees.java:156)
   at org.netbeans.modules.java.completion.BaseTask.getEnvImpl(BaseTask.java:313)
   at org.netbeans.modules.java.completion.BaseTask.getCompletionEnvironment(BaseTask.java:265)
   at org.netbeans.modules.java.completion.JavaCompletionTask.resolve(JavaCompletionTask.java:265)
   at org.netbeans.modules.java.completion.BaseTask.run(BaseTask.java:92)
   at org.netbeans.modules.java.completion.JavaCompletionTask.run(JavaCompletionTask.java:80)
   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$2.call(TaskProcessor.java:201)
   at org.netbeans.modules.masterfs.filebasedfs.utils.FileChangedManager.priorityIO(FileChangedManager.java:176)
   at org.netbeans.modules.masterfs.providers.ProvidedExtensions.priorityIO(ProvidedExtensions.java:360)
   at org.netbeans.modules.parsing.nb.DataObjectEnvFactory.runPriorityIO(DataObjectEnvFactory.java:141)
   at org.netbeans.modules.parsing.impl.Utilities.runPriorityIO(Utilities.java:88)
Caused: org.netbeans.modules.parsing.spi.ParseException
   at org.netbeans.modules.parsing.impl.TaskProcessor.runUserTask(TaskProcessor.java:209)
   at org.netbeans.modules.parsing.api.ParserManager.parse(ParserManager.java:104)
   at org.netbeans.modules.editor.java.JavaCompletionProvider$JavaCompletionQuery.query(JavaCompletionProvider.java:234)
   at org.netbeans.spi.editor.completion.support.AsyncCompletionTask.run(AsyncCompletionTask.java:223)
   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)