java.lang.NullPointerException
   at org.netbeans.modules.web.debug.EngineContextProviderImpl.getDefaultContext(EngineContextProviderImpl.java:154)
   at org.netbeans.modules.web.debug.EngineContextProviderImpl.getURL(EngineContextProviderImpl.java:135)
   at org.netbeans.modules.debugger.jpda.ui.SourcePath$CompoundContextProvider.getURL(SourcePath.java:757)
   at org.netbeans.modules.debugger.jpda.ui.SourcePath$CompoundContextProvider.getURL(SourcePath.java:757)
   at org.netbeans.modules.debugger.jpda.ui.SourcePath$CompoundContextProvider.getURL(SourcePath.java:757)
   at org.netbeans.modules.debugger.jpda.ui.SourcePath.getURL(SourcePath.java:157)
   at org.netbeans.modules.debugger.jpda.ui.SourcePath.getURL(SourcePath.java:335)
   at org.netbeans.modules.debugger.jpda.ui.SourcePath.getURL(SourcePath.java:318)
   at org.netbeans.modules.debugger.jpda.ui.SourcePath.annotate(SourcePath.java:614)
   at org.netbeans.modules.debugger.jpda.ui.CurrentThreadAnnotationListener$AnnotateCallStackTask.run(CurrentThreadAnnotationListener.java:501)
Caused: org.openide.util.RequestProcessor$SlowItem: task failed due to: java.lang.NullPointerException
   at org.openide.util.RequestProcessor$Task.schedule(RequestProcessor.java:1464)
   at org.netbeans.modules.debugger.jpda.ui.CurrentThreadAnnotationListener.annotateCallStack(CurrentThreadAnnotationListener.java:431)
   at org.netbeans.modules.debugger.jpda.ui.CurrentThreadAnnotationListener.annotate(CurrentThreadAnnotationListener.java:303)
   at org.netbeans.modules.debugger.jpda.ui.CurrentThreadAnnotationListener.access$400(CurrentThreadAnnotationListener.java:77)
   at org.netbeans.modules.debugger.jpda.ui.CurrentThreadAnnotationListener$1.run(CurrentThreadAnnotationListener.java:247)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1423)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2033)