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我正在使用GWT-RPC用服務器中的數據填充Ext-GWT TreeGrids。我使用4個回調來填充6個TreeGrid。由於onSuccess函數的回調通過插入行來修改TreeGrid，因此TreeGridView需要呈現行。回調類被稱爲MainPnlSummaryTablesAsyncCallback。Ext-GWT TreeGrid間接調用GWT-RPC回調？爲什麼？
由於某些原因，當需要通過JSNI確定TreeGridView的滾動條offsetHeight時，onSuccess或onFailure會在堆棧跟蹤中的另一個回調實例上調用。下面是我遇到的堆棧跟蹤的副本。
這難道不是很奇怪嗎？這是爲什麼發生？
僅供參考我使用EXT-GWT 2.0.1和1.7.0 GWT和我使用主機模式瀏覽器來調試這一點，但我敢肯定，這是Web模式的問題。
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)