java.lang.AssertionError
        at org.netbeans.api.java.source.JavaSource.createTaggedController(JavaSource.java:508)
        at org.netbeans.api.java.source.JavaSource$JavaSourceAccessorImpl.createTaggedCompilationController(JavaSource.java:695)
        at org.netbeans.modules.java.source.JavaSourceUtilImpl.createTaggedCompilationController(JavaSourceUtilImpl.java:56)
        at org.netbeans.modules.java.preprocessorbridge.spi.JavaSourceUtilImpl$MyAccessor.createTaggedCompilationController(JavaSourceUtilImpl.java:75)
        at org.netbeans.modules.java.preprocessorbridge.api.JavaSourceUtil.createControllerHandle(JavaSourceUtil.java:93)
        at org.netbeans.modules.debugger.jpda.projects.EditorContextImpl.getPreferredCompilationController(EditorContextImpl.java:1112)
        at org.netbeans.modules.debugger.jpda.projects.EditorContextImpl.parseExpression(EditorContextImpl.java:1483)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(NativeMethodAccessorImpl.java:0)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at org.netbeans.modules.debugger.jpda.EditorContextBridge.parseExpression(EditorContextBridge.java:128)
        at org.netbeans.modules.debugger.jpda.expr.TreeEvaluator.evaluate(TreeEvaluator.java:123)
        at org.netbeans.modules.debugger.jpda.JPDADebuggerImpl.evaluateIn(JPDADebuggerImpl.java:770)
        at org.netbeans.modules.debugger.jpda.JPDADebuggerImpl.evaluateIn(JPDADebuggerImpl.java:667)
        at org.netbeans.modules.debugger.jpda.JPDADebuggerImpl.evaluateIn(JPDADebuggerImpl.java:636)
        at org.netbeans.modules.debugger.jpda.JPDADebuggerImpl.evaluate(JPDADebuggerImpl.java:293)
        at org.netbeans.modules.debugger.jpda.projects.ToolTipAnnotation.run(ToolTipAnnotation.java:169)
        at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:572)
        at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:997)