java.lang.NullPointerException
   at com.sun.tools.javac.comp.MemberEnter.getMethodEnv(MemberEnter.java:896)
   at com.sun.tools.javac.api.JavacTrees.getAttrContext(JavacTrees.java:311)
   at com.sun.tools.javac.api.JavacTrees.getScope(JavacTrees.java:217)
   at com.sun.tools.javac.api.JavacTrees.getScope(JavacTrees.java:84)
   at org.netbeans.api.java.source.TreeUtilities.scopeFor(TreeUtilities.java:503)
   at org.netbeans.modules.debugger.jpda.projects.EditorContextImpl.computeOperations(EditorContextImpl.java:2601)
   at org.netbeans.modules.debugger.jpda.projects.EditorContextImpl.getOperations(EditorContextImpl.java:1728)
   at org.netbeans.modules.debugger.jpda.ExpressionPool.createExpressionAt(ExpressionPool.java:186)
   at org.netbeans.modules.debugger.jpda.ExpressionPool.getExpressionAt(ExpressionPool.java:102)
   at org.netbeans.modules.debugger.jpda.actions.StepActionProvider$2.run(StepActionProvider.java:596)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1454)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2048)
Caused: org.openide.util.RequestProcessor$SlowItem: task failed due to: java.lang.NullPointerException
   at org.openide.util.RequestProcessor$Task.schedule(RequestProcessor.java:1495)
   at org.netbeans.modules.debugger.jpda.actions.StepActionProvider.setOperationsLazily(StepActionProvider.java:661)
   at org.netbeans.modules.debugger.jpda.actions.StepActionProvider.setLastOperation(StepActionProvider.java:579)
   at org.netbeans.modules.debugger.jpda.actions.StepActionProvider.setLastOperation(StepActionProvider.java:527)
   at org.netbeans.modules.debugger.jpda.actions.StepActionProvider.exec(StepActionProvider.java:396)
   at org.netbeans.modules.debugger.jpda.util.Operator.processEvents(Operator.java:487)
   at org.netbeans.modules.debugger.jpda.util.Operator.access$800(Operator.java:116)
   at org.netbeans.modules.debugger.jpda.util.Operator$1.run(Operator.java:244)
   at java.lang.Thread.run(Thread.java:722)