java.lang.NullPointerException
        at com.sun.tools.javac.comp.Flow.visitIdent(Flow.java:1228)
        at com.sun.tools.javac.tree.JCTree$JCIdent.accept(JCTree.java:1683)
        at com.sun.tools.javac.tree.TreeScanner.scan(TreeScanner.java:49)
        at com.sun.tools.javac.tree.TreeScanner.visitSelect(TreeScanner.java:250)
        at com.sun.tools.javac.tree.JCTree$JCFieldAccess.accept(JCTree.java:1655)
        at com.sun.tools.javac.tree.TreeScanner.scan(TreeScanner.java:49)
        at com.sun.tools.javac.comp.Flow.scanExpr(Flow.java:514)
        at com.sun.tools.javac.comp.Flow.visitApply(Flow.java:1129)
        at com.sun.tools.javac.tree.JCTree$JCMethodInvocation.accept(JCTree.java:1300)
        at com.sun.tools.javac.tree.TreeScanner.scan(TreeScanner.java:49)
        at com.sun.tools.javac.comp.Flow.scanExpr(Flow.java:514)
        at com.sun.tools.javac.comp.Flow.visitVarDef(Flow.java:751)
        at com.sun.tools.javac.tree.JCTree$JCVariableDecl.accept(JCTree.java:713)
        at com.sun.tools.javac.tree.TreeScanner.scan(TreeScanner.java:49)
        at com.sun.tools.javac.comp.Flow.scanStat(Flow.java:498)
        at com.sun.tools.javac.comp.Flow.scanDef(Flow.java:484)
        at com.sun.tools.javac.comp.Flow.visitClassDef(Flow.java:595)
        at com.sun.tools.javac.tree.JCTree$JCClassDecl.accept(JCTree.java:588)
        at com.sun.tools.javac.tree.TreeScanner.scan(TreeScanner.java:49)
        at com.sun.tools.javac.comp.Flow.scanStat(Flow.java:498)
        at com.sun.tools.javac.comp.Flow.scanDef(Flow.java:484)
        at com.sun.tools.javac.comp.Flow.visitClassDef(Flow.java:595)
        at com.sun.tools.javac.tree.JCTree$JCClassDecl.accept(JCTree.java:588)
        at com.sun.tools.javac.tree.TreeScanner.scan(TreeScanner.java:49)
        at com.sun.tools.javac.comp.Flow.analyzeTree(Flow.java:1298)
        at com.sun.tools.javac.main.JavaCompiler.flow(JavaCompiler.java:1121)
        at com.sun.tools.javac.main.JavaCompiler.flow(JavaCompiler.java:1082)
        at com.sun.tools.javac.api.JavacTaskImpl.analyze(JavacTaskImpl.java:437)
        at com.sun.tools.javac.api.JavacTaskImpl.analyze(JavacTaskImpl.java:417)
        at org.netbeans.modules.java.source.usages.RepositoryUpdater$CompileWorker.updateFile(RepositoryUpdater.java:2273)
        at org.netbeans.modules.java.source.usages.RepositoryUpdater$CompileWorker.compileWithDeps(RepositoryUpdater.java:2506)
        at org.netbeans.modules.java.source.usages.RepositoryUpdater$CompileWorker.access$3300(RepositoryUpdater.java:1232)
        at org.netbeans.modules.java.source.usages.RepositoryUpdater$CompileWorker$1.run(RepositoryUpdater.java:1505)
        at org.netbeans.modules.java.source.usages.RepositoryUpdater$CompileWorker$1.run(RepositoryUpdater.java:1274)
        at org.netbeans.modules.java.source.usages.ClassIndexManager.writeLock(ClassIndexManager.java:105)
        at org.netbeans.modules.java.source.usages.RepositoryUpdater$CompileWorker.run(RepositoryUpdater.java:1271)
        at org.netbeans.modules.java.source.usages.RepositoryUpdater$CompileWorker.run(RepositoryUpdater.java:1232)
        at org.netbeans.api.java.source.JavaSource$CompilationJob.run(JavaSource.java:1559)
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
        at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
        at java.util.concurrent.FutureTask.run(FutureTask.java:138)
        at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:885)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:907)
        at java.lang.Thread.run(Thread.java:619)