Ext-GWT TreeGrid ruft indirekt einen GWT-RPC Callback? Warum?

Question

I GWT-RPC bin mit Ext-GWT TreeGrids mit Daten von einem Server zu füllen. Ich bin mit 4 Rückrufe 6 TreeGrids aufzufüllen. Da die Callback-Funktion onSuccess die TreeGrid durch Einfügen von Zeilen ändert, muss die TreeGridView die Zeilen machen. Die Callback-Klasse wird aufgerufen MainPnlSummaryTablesAsyncCallback.

Aus irgendeinem Grunde, wenn es braucht die TreeGridView des Stellrad des offset über JSNI, onSuccess oder onFailure zu bestimmen, auf einer anderen Instanz des Rückrufs in dem Stack-Trace genannt. Eine Kopie des Stack-Trace I auftreten, ist unten.

Ist das nicht wirklich seltsam? Warum ist das passiert?

Zu Ihrer Information Ich bin mit Ext-GWT 2.0.1 und GWT 1.7.0 und ich bin mit gehosteten Modus Browser dies zu debuggen, obwohl ich ziemlich sicher bin, dass dies ein Problem für Web-Modus.

PnlSummaryClientDebug_as10node6 [Java Application]  
com.google.gwt.dev.HostedMode at localhost:3595 
    Thread [main] (Suspended (breakpoint at line 403 in MainPage$MainPnlSummaryTablesAsyncCallback))    
        MainPage$8(MainPage$MainPnlSummaryTablesAsyncCallback).onSuccess(GWTPair<AggregateStringGWTTable,AggregateStringGWTTable>) line: 403    
        MainPage$8(MainPage$MainPnlSummaryTablesAsyncCallback).onSuccess(Object) line: 1    
        RequestCallbackAdapter<T>.onResponseReceived(Request, Response) line: 215   
        Request.fireOnResponseReceivedImpl(RequestCallback) line: 264   
        Request.fireOnResponseReceivedAndCatch(GWT$UncaughtExceptionHandler, RequestCallback) line: 236 
        Request.fireOnResponseReceived(RequestCallback) line: 227   
        NativeMethodAccessorImpl.invoke0(Method, Object, Object[]) line: not available [native method] [local variables unavailable]    
        NativeMethodAccessorImpl.invoke(Object, Object[]) line: 39  
        DelegatingMethodAccessorImpl.invoke(Object, Object[]) line: 25  
        Method.invoke(Object, Object...) line: 597  
        MethodAdaptor.invoke(Object, Object...) line: 103   
        IDispatchImpl.callMethod(CompilingClassLoader, Object, Variant[], MethodAdaptor) line: 126  
        IDispatchProxy.invoke(int, int, Variant[]) line: 155    
        IDispatchProxy(IDispatchImpl).Invoke(int, int, int, int, int, int, int, int) line: 294  
        IDispatchProxy(IDispatchImpl).method6(int[]) line: 194  
        COMObject.callback6(int[]) line: 117    
        COM.VtblCall(int, int, int, GUID, int, int, DISPPARAMS, int, EXCEPINFO, int[]) line: not available [native method]  
        IDispatch.Invoke(int, GUID, int, int, DISPPARAMS, int, EXCEPINFO, int[]) line: 64   
        OleAutomation.invoke(int, int, Variant[], int[], Variant) line: 493 
        OleAutomation.invoke(int, Variant[]) line: 417  
        ModuleSpaceIE6.doInvokeOnWindow(OleAutomation, String, Variant[]) line: 68  
        ModuleSpaceIE6.doInvoke(String, Object, Class<?>[], Object[]) line: 153 
        ModuleSpaceIE6(ModuleSpace).invokeNative(String, Object, Class<?>[], Object[]) line: 453    
        ModuleSpaceIE6(ModuleSpace).invokeNativeInt(String, Object, Class<?>[], Object[]) line: 207 
        JavaScriptHost.invokeNativeInt(String, Object, Class<?>[], Object[]) line: 75   
        Element$.getOffsetHeight$(Element) line: not available  
        El.getHeight(boolean) line: 984 
        TreeGridView(BufferView).getVisibleRowCount() line: 313 
        TreeGridView(BufferView).doRender(List<ColumnData>, List<ModelData>, int, int, boolean, boolean) line: 189  
        TreeGridView(BufferView).doRender(List<ColumnData>, List<ModelData>, int, int, boolean) line: 181   
        TreeGridView(GridView).renderRows(int, int) line: 1559  
        TreeGridView(GridView).insertRows(ListStore<ModelData>, int, int, boolean) line: 1242   
        TreeGridView(GridView).onAdd(ListStore<ModelData>, List<ModelData>, int) line: 1293 
        GridView$5.storeAdd(StoreEvent<ModelData>) line: 1179   
        GridView$5(StoreListener<M>).handleEvent(StoreEvent<M>) line: 22    
        GridView$5(StoreListener<M>).handleEvent(BaseEvent) line: 1 
        TreeGrid$2(BaseObservable).callListener(Listener<BaseEvent>, BaseEvent) line: 176   
        TreeGrid$2(BaseObservable).fireEvent(EventType, BaseEvent) line: 96 
        TreeGrid$2(ListStore<M>).insert(List<? extends M>, int, boolean) line: 467  
        TreeGrid$2(ListStore<M>).insert(List<? extends M>, int) line: 266   
        TreeGrid<M>.onAdd(TreeStoreEvent<M>) line: 430  
        TreeGrid$1.storeAdd(StoreEvent<M>) line: 123    
        TreeGrid$1(StoreListener<M>).handleEvent(StoreEvent<M>) line: 22    
        TreeGrid$1(StoreListener<M>).handleEvent(BaseEvent) line: 1 
        TreeStore<M>(BaseObservable).callListener(Listener<BaseEvent>, BaseEvent) line: 176 
        TreeStore<M>(BaseObservable).fireEvent(EventType, BaseEvent) line: 96   
        TreeStore<M>.doInsert(TreeModel, List<TreeModel>, int, boolean, boolean) line: 799  
        TreeStore<M>.insert(List<M>, int, boolean) line: 493    
        TreeStore<M>.add(List<M>, boolean) line: 163    
        TreeStore<M>.add(M, boolean) line: 174  
        PnlClientFactory.populatePnlDataTreeStore(AggregateStringGWTTable, TreeStore<BaseModel>) line: 42   
        MainPage$9(MainPage$MainPnlSummaryTablesAsyncCallback).onSuccess(GWTPair<AggregateStringGWTTable,AggregateStringGWTTable>) line: 403    
        MainPage$9(MainPage$MainPnlSummaryTablesAsyncCallback).onSuccess(Object) line: 1    
        RequestCallbackAdapter<T>.onResponseReceived(Request, Response) line: 215   
        Request.fireOnResponseReceivedImpl(RequestCallback) line: 264   
        Request.fireOnResponseReceivedAndCatch(GWT$UncaughtExceptionHandler, RequestCallback) line: 236 
        Request.fireOnResponseReceived(RequestCallback) line: 227   
        NativeMethodAccessorImpl.invoke0(Method, Object, Object[]) line: not available [native method]  
        NativeMethodAccessorImpl.invoke(Object, Object[]) line: 39  
        DelegatingMethodAccessorImpl.invoke(Object, Object[]) line: 25  
        Method.invoke(Object, Object...) line: 597  
        MethodAdaptor.invoke(Object, Object...) line: 103   
        IDispatchImpl.callMethod(CompilingClassLoader, Object, Variant[], MethodAdaptor) line: 126  
        IDispatchProxy.invoke(int, int, Variant[]) line: 155    
        IDispatchProxy(IDispatchImpl).Invoke(int, int, int, int, int, int, int, int) line: 294  
        IDispatchProxy(IDispatchImpl).method6(int[]) line: 194  
        COMObject.callback6(int[]) line: 117    
        OS.DispatchMessageW(MSG) line: not available [native method]    
        OS.DispatchMessage(MSG) line: 1925  
        Display.readAndDispatch() line: 2966    
        HostedMode(SwtHostedModeBase).processEvents() line: 235 
        HostedMode(HostedModeBase).pumpEventLoop() line: 558    
        HostedMode(HostedModeBase).run() line: 405  
        HostedMode.main(String[]) line: 232 
C:\Program Files\Java\jdk1.6.0_06\bin\javaw.exe (Jul 29, 2009 2:11:16 PM)   

Answer 1

Ok, so scheint es, dass der Server einige Nullpointerexceptions warf, wenn die RPC-Aufrufe gemacht wurden ... immer noch, ich verstehe nicht, warum die clientseitige Stack-Trace sah wie folgt aus (sieht irgendwie irreführend, als ob zwei stapeln Spuren ineinander geblutet).