java.lang.IllegalStateException: PLUS at org.netbeans.modules.java.hints.introduce.Flow$VisitorImpl.visitCompoundAssignment(Flow.java:243) at org.netbeans.modules.java.hints.introduce.Flow$VisitorImpl.visitCompoundAssignment(Flow.java:175) at com.sun.tools.javac.tree.JCTree$JCAssignOp.accept(JCTree.java:1511) at com.sun.source.util.TreePathScanner.scan(TreePathScanner.java:67) at org.netbeans.api.java.source.support.CancellableTreePathScanner.scan(CancellableTreePathScanner.java:94) at org.netbeans.modules.java.hints.introduce.Flow$VisitorImpl.scan(Flow.java:192) at org.netbeans.modules.java.hints.introduce.Flow$VisitorImpl.visitCompoundAssignment(Flow.java:246) at org.netbeans.modules.java.hints.introduce.Flow$VisitorImpl.visitCompoundAssignment(Flow.java:175) at com.sun.tools.javac.tree.JCTree$JCAssignOp.accept(JCTree.java:1511) at com.sun.source.util.TreePathScanner.scan(TreePathScanner.java:67) at org.netbeans.api.java.source.support.CancellableTreePathScanner.scan(CancellableTreePathScanner.java:94) at org.netbeans.modules.java.hints.introduce.Flow$VisitorImpl.scan(Flow.java:192) at org.netbeans.modules.java.hints.introduce.Flow$VisitorImpl.scan(Flow.java:175) at com.sun.source.util.TreeScanner.visitExpressionStatement(TreeScanner.java:240) at org.netbeans.modules.java.hints.introduce.Flow$VisitorImpl.visitExpressionStatement(Flow.java:702) at org.netbeans.modules.java.hints.introduce.Flow$VisitorImpl.visitExpressionStatement(Flow.java:175) at com.sun.tools.javac.tree.JCTree$JCExpressionStatement.accept(JCTree.java:1178) at com.sun.source.util.TreePathScanner.scan(TreePathScanner.java:67) at org.netbeans.api.java.source.support.CancellableTreePathScanner.scan(CancellableTreePathScanner.java:94) at org.netbeans.modules.java.hints.introduce.Flow$VisitorImpl.scan(Flow.java:192) at org.netbeans.modules.java.hints.introduce.Flow$VisitorImpl.scan(Flow.java:175) at com.sun.source.util.TreeScanner.scanAndReduce(TreeScanner.java:80) at com.sun.source.util.TreeScanner.scan(TreeScanner.java:90) at org.netbeans.api.java.source.support.CancellableTreePathScanner.scan(CancellableTreePathScanner.java:103) at com.sun.source.util.TreeScanner.visitBlock(TreeScanner.java:159) at org.netbeans.modules.java.hints.introduce.Flow$VisitorImpl.visitBlock(Flow.java:747) at org.netbeans.modules.java.hints.introduce.Flow$VisitorImpl.visitBlock(Flow.java:175) at com.sun.tools.javac.tree.JCTree$JCBlock.accept(JCTree.java:795) at com.sun.source.util.TreePathScanner.scan(TreePathScanner.java:67) at org.netbeans.api.java.source.support.CancellableTreePathScanner.scan(CancellableTreePathScanner.java:94) at org.netbeans.modules.java.hints.introduce.Flow$VisitorImpl.scan(Flow.java:192) at org.netbeans.modules.java.hints.introduce.Flow$VisitorImpl.visitMethod(Flow.java:463) at org.netbeans.modules.java.hints.introduce.Flow$VisitorImpl.visitMethod(Flow.java:175) at com.sun.tools.javac.tree.JCTree$JCMethodDecl.accept(JCTree.java:695) at com.sun.source.util.TreePathScanner.scan(TreePathScanner.java:67) at org.netbeans.api.java.source.support.CancellableTreePathScanner.scan(CancellableTreePathScanner.java:94) at org.netbeans.modules.java.hints.introduce.Flow$VisitorImpl.scan(Flow.java:192) at org.netbeans.modules.java.hints.introduce.Flow$VisitorImpl.scan(Flow.java:175) at com.sun.source.util.TreeScanner.scanAndReduce(TreeScanner.java:80) at com.sun.source.util.TreeScanner.scan(TreeScanner.java:90) at org.netbeans.api.java.source.support.CancellableTreePathScanner.scan(CancellableTreePathScanner.java:103) at com.sun.source.util.TreeScanner.scanAndReduce(TreeScanner.java:98) at com.sun.source.util.TreeScanner.visitClass(TreeScanner.java:132) at org.netbeans.modules.java.hints.introduce.Flow$VisitorImpl.visitClass(Flow.java:732) at org.netbeans.modules.java.hints.introduce.Flow$VisitorImpl.visitClass(Flow.java:175) at com.sun.tools.javac.tree.JCTree$JCClassDecl.accept(JCTree.java:622) at com.sun.source.util.TreePathScanner.scan(TreePathScanner.java:67) at org.netbeans.api.java.source.support.CancellableTreePathScanner.scan(CancellableTreePathScanner.java:94) at org.netbeans.modules.java.hints.introduce.Flow$VisitorImpl.scan(Flow.java:192) at org.netbeans.modules.java.hints.introduce.Flow$VisitorImpl.scan(Flow.java:175) at com.sun.source.util.TreeScanner.scan(TreeScanner.java:90) at org.netbeans.api.java.source.support.CancellableTreePathScanner.scan(CancellableTreePathScanner.java:103) at com.sun.source.util.TreeScanner.scanAndReduce(TreeScanner.java:98) at com.sun.source.util.TreeScanner.visitCompilationUnit(TreeScanner.java:119) at org.netbeans.modules.java.hints.introduce.Flow$VisitorImpl.visitCompilationUnit(Flow.java:727) at org.netbeans.modules.java.hints.introduce.Flow$VisitorImpl.visitCompilationUnit(Flow.java:175) at com.sun.tools.javac.tree.JCTree$JCCompilationUnit.accept(JCTree.java:490) at com.sun.source.util.TreePathScanner.scan(TreePathScanner.java:49) at org.netbeans.modules.java.hints.introduce.Flow.assignmentsForUse(Flow.java:131) at org.netbeans.modules.java.hints.introduce.Flow.assignmentsForUse(Flow.java:124) at org.netbeans.modules.java.hints.bugs.UnusedAssignmentOrBranch.compute(UnusedAssignmentOrBranch.java:125) at org.netbeans.modules.java.hints.bugs.UnusedAssignmentOrBranch.run(UnusedAssignmentOrBranch.java:111) at org.netbeans.modules.java.hints.bugs.UnusedAssignmentOrBranch.run(UnusedAssignmentOrBranch.java:97) at org.netbeans.modules.java.source.JavaSourceAccessor$CancelableTaskWrapper.run(JavaSourceAccessor.java:322) at org.netbeans.modules.parsing.impl.TaskProcessor.callParserResultTask(TaskProcessor.java:615) at org.netbeans.modules.parsing.impl.TaskProcessor$CompilationJob.run(TaskProcessor.java:786) at java.util.concurrent.Executors$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:886) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) at java.lang.Thread.run(Thread.java:662)