我有一个基于 SWT 构建的桌面应用程序。我有一棵树，它包含在 ScrolledComposite 中。应用程序中的这段代码应该刷新 ui 组件。
aTreeViewer.setInput(this.items) //items is an array list of relevant objects
但它在 Windows XP 和 Windows 7 上的行为很奇怪。在 Win XP 中，它返回时会返回一个硬 ArrayIndexOutofBounds 异常，该异常会影响我的应用程序的行为。
java.lang.ArrayIndexOutOfBoundsException: 46
at org.eclipse.swt.widgets.Tree._getItem(Tree.java:254)
at org.eclipse.swt.widgets.Tree._getItem(Tree.java:248)
at org.eclipse.swt.widgets.Tree.findCell(Tree.java:2703)
at org.eclipse.swt.widgets.Tree.WM_MOUSEMOVE(Tree.java:6806)
at org.eclipse.swt.widgets.Control.windowProc(Control.java:4575)
at org.eclipse.swt.widgets.Tree.windowProc(Tree.java:5958)
at org.eclipse.swt.widgets.Display.windowProc(Display.java:4989)
at org.eclipse.swt.internal.win32.OS.DispatchMessageW(Native Method)
at org.eclipse.swt.internal.win32.OS.DispatchMessage(OS.java:2546)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3756)
而在 Win 7 上，它似乎从 SWT 层返回，并带有一条似乎是 RunTimeException 的消息，该消息打印在我的 eclipse 控制台上，但绝不会影响应用程序的行为。这意味着该应用程序运行良好。
Ignored reentrant call while viewer is busy. This is only logged once per viewer instance, but similar calls will still be ignored.
java.lang.RuntimeException
at org.eclipse.jface.viewers.ColumnViewer.checkBusy(ColumnViewer.java:763)
at org.eclipse.jface.viewers.ColumnViewer.refresh(ColumnViewer.java:541)
at org.eclipse.jface.viewers.StructuredViewer.refresh(StructuredViewer.java:1490)
at com.sxsy.smtj.ui.cw.widgets.EwList.basicRefresh(EwList.java:86)
at com.sxsy.smtj.ui.cw.widgets.EwTableList.basicRefresh(EwTableList.java:75)
at com.sxsy.smtj.ui.cw.widgets.EwList.refresh(EwList.java:402)
at com.sxsy.smtj.ui.cw.widgets.EwTableList.columnsChanged(EwTableList.java:115)
at com.sxsy.smtj.ui.cw.widgets.EwTableColumn.updateWidget(EwTableColumn.java:377)
at com.sxsy.smtj.ui.cw.widgets.EwTableColumn.width(EwTableColumn.java:407)
at com.sxsy.smtj.ui.cw.widgets.WkTableWidget.doAutoSizeColumns(WkTableWidget.java:244)
at com.sxsy.smtj.ui.cw.widgets.WkTableWidget.autoSizeColumns(WkTableWidget.java:87)
at com.sxsy.smtj.ui.cw.widgets.WkTableWidget.processResizedEvent(WkTableWidget.java:437)
at com.sxsy.smtj.ui.cw.widgets.EwList$3.controlResized(EwList.java:449)
at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:235)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1053)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1077)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1058)
at org.eclipse.swt.widgets.Tree.windowProc(Tree.java:5795)
at org.eclipse.swt.widgets.Display.windowProc(Display.java:4976)
at org.eclipse.swt.internal.win32.OS.DefWindowProcW(Native Method)
at org.eclipse.swt.internal.win32.OS.DefWindowProc(OS.java:2541)
at org.eclipse.swt.widgets.Tree.callWindowProc(Tree.java:1442)
at org.eclipse.swt.widgets.Tree.windowProc(Tree.java:5859)
at org.eclipse.swt.widgets.Display.windowProc(Display.java:4976)
at org.eclipse.swt.internal.win32.OS.SetScrollInfo(Native Method)
at org.eclipse.swt.widgets.Tree.updateScrollBar(Tree.java:5660)
at org.eclipse.swt.widgets.Tree.callWindowProc(Tree.java:1589)
at org.eclipse.swt.widgets.Scrollable.WM_SIZE(Scrollable.java:316)
at org.eclipse.swt.widgets.Composite.WM_SIZE(Composite.java:1662)
at org.eclipse.swt.widgets.Tree.WM_SIZE(Tree.java:7137)
at org.eclipse.swt.widgets.Control.windowProc(Control.java:4603)
at org.eclipse.swt.widgets.Tree.windowProc(Tree.java:5958)
at org.eclipse.swt.widgets.Display.windowProc(Display.java:4976)
at org.eclipse.swt.internal.win32.OS.CallWindowProcW(Native Method)
at org.eclipse.swt.internal.win32.OS.CallWindowProc(OS.java:2440)
at org.eclipse.swt.widgets.Tree.callWindowProc(Tree.java:1534)
at org.eclipse.swt.widgets.Control.WM_WINDOWPOSCHANGED(Control.java:5408)
at org.eclipse.swt.widgets.Control.windowProc(Control.java:4616)
at org.eclipse.swt.widgets.Tree.windowProc(Tree.java:5958)
at org.eclipse.swt.widgets.Display.windowProc(Display.java:4976)
at org.eclipse.swt.internal.win32.OS.ShowScrollBar(Native Method)
at org.eclipse.swt.widgets.Tree.WM_SIZE(Tree.java:7124)
at org.eclipse.swt.widgets.Control.windowProc(Control.java:4603)
at org.eclipse.swt.widgets.Tree.windowProc(Tree.java:5958)
at org.eclipse.swt.widgets.Display.windowProc(Display.java:4976)
at org.eclipse.swt.internal.win32.OS.CallWindowProcW(Native Method)
at org.eclipse.swt.internal.win32.OS.CallWindowProc(OS.java:2440)
at org.eclipse.swt.widgets.Tree.callWindowProc(Tree.java:1534)
at org.eclipse.swt.widgets.Control.WM_WINDOWPOSCHANGED(Control.java:5408)
at org.eclipse.swt.widgets.Control.windowProc(Control.java:4616)
at org.eclipse.swt.widgets.Tree.windowProc(Tree.java:5958)
at org.eclipse.swt.widgets.Display.windowProc(Display.java:4976)
at org.eclipse.swt.internal.win32.OS.CallWindowProcW(Native Method)
at org.eclipse.swt.internal.win32.OS.CallWindowProc(OS.java:2440)
at org.eclipse.swt.widgets.Tree.callWindowProc(Tree.java:1534)
at org.eclipse.swt.widgets.Control.windowProc(Control.java:4623)
at org.eclipse.swt.widgets.Tree.windowProc(Tree.java:5958)
at org.eclipse.swt.widgets.Display.windowProc(Display.java:4976)
at org.eclipse.swt.internal.win32.OS.SendMessageW(Native Method)
at org.eclipse.swt.internal.win32.OS.SendMessage(OS.java:3385)
at org.eclipse.swt.widgets.Tree.createItem(Tree.java:2104)
at org.eclipse.swt.widgets.TreeItem.<init>(TreeItem.java:203)
at org.eclipse.swt.widgets.TreeItem.<init>(TreeItem.java:91)
at org.eclipse.jface.viewers.TreeViewer.createNewRowPart(TreeViewer.java:809)
at org.eclipse.jface.viewers.TreeViewer.newItem(TreeViewer.java:315)
at org.eclipse.jface.viewers.AbstractTreeViewer.createTreeItem(AbstractTreeViewer.java:847)
at org.eclipse.jface.viewers.AbstractTreeViewer$1.run(AbstractTreeViewer.java:823)
at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:70)
at org.eclipse.jface.viewers.AbstractTreeViewer.createChildren(AbstractTreeViewer.java:797)
at org.eclipse.jface.viewers.TreeViewer.createChildren(TreeViewer.java:644)
at org.eclipse.jface.viewers.AbstractTreeViewer.createChildren(AbstractTreeViewer.java:768)
at org.eclipse.jface.viewers.AbstractTreeViewer.internalInitializeTree(AbstractTreeViewer.java:1548)
at org.eclipse.jface.viewers.TreeViewer.internalInitializeTree(TreeViewer.java:833)
at org.eclipse.jface.viewers.AbstractTreeViewer$5.run(AbstractTreeViewer.java:1532)
at org.eclipse.jface.viewers.StructuredViewer.preservingSelection(StructuredViewer.java:1443)
at org.eclipse.jface.viewers.TreeViewer.preservingSelection(TreeViewer.java:403)
at org.eclipse.jface.viewers.StructuredViewer.preservingSelection(StructuredViewer.java:1404)
at org.eclipse.jface.viewers.AbstractTreeViewer.inputChanged(AbstractTreeViewer.java:1525)
at org.eclipse.jface.viewers.ContentViewer.setInput(ContentViewer.java:280)
at org.eclipse.jface.viewers.StructuredViewer.setInput(StructuredViewer.java:1690)
at com.sxsy.smtj.ui.cw.widgets.EwList.refreshItems(EwList.java:439)
at com.sxsy.smtj.ui.cw.widgets.EwTableList.refreshItems(EwTableList.java:514)
at com.sxsy.smtj.ui.cw.widgets.EwTableTree.refreshItems(EwTableTree.java:275)
at com.sxsy.smtj.ui.cw.widgets.EwList.itemsHaveChanged(EwList.java:345)
at com.sxsy.smtj.ui.cw.widgets.EwLinearList.itemsHaveChanged(EwLinearList.java:200)
at com.sxsy.smtj.ui.cw.widgets.EwList.setItems(EwList.java:549)
at com.sxsy.smtj.ui.cw.widgets.WkTableWidget.setItems(WkTableWidget.java:467)
at com.sxsy.smtj.ui.abt.widgets.compatibility.ExtendedList.widgetSetItems(ExtendedList.java:574)
at com.sxsy.smtj.ui.abt.widgets.compatibility.ExtendedList.setItems(ExtendedList.java:479)
at com.sxsy.smtj.ui.wk.table.compatibility.WkTableWidgetView.setItems(WkTableWidgetView.java:645)
at com.misys.liq.ui.collateral.LiqCollateralAgreementTypeDefinitionController.updateAttributeGrid(LiqCollateralAgreementTypeDefinitionController.java:1712)
at com.misys.liq.ui.collateral.LiqCollateralAgreementTypeDefinitionController.showCoreAttributes(LiqCollateralAgreementTypeDefinitionController.java:1730)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at com.sxsy.smtj.utilities.ReflectionUtility.invoke(ReflectionUtility.java:754)
at com.sxsy.smtj.utilities.ReflectionUtility.directPerform(ReflectionUtility.java:740)
at com.sxsy.smtj.utilities.ReflectionUtility.perform(ReflectionUtility.java:605)
at com.sxsy.smtj.compatibility.va.kernel.core.DirectedMessage.performAction(DirectedMessage.java:106)
at com.misys.liq.infrastructure.EventObservableSupport.signalEvent(EventObservableSupport.java:21)
at com.sxsy.smtj.ui.abt.ObservableObject.primSignalEvent(ObservableObject.java:324)
at com.sxsy.smtj.ui.abt.ObservableObject.signalEvent(ObservableObject.java:398)
at com.sxsy.smtj.ui.abt.widgets.compatibility.BasicView.signalEvent(BasicView.java:1879)
at com.sxsy.smtj.ui.abt.widgets.compatibility.ToggleButtonView$2.widgetSelected(ToggleButtonView.java:316)
at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:248)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1053)
at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4169)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3758)
at com.misys.liq.LoanIQ$13.value(LoanIQ.java:676)
at com.sxsy.smtj.exceptions.ExceptionUtility.whenDo(ExceptionUtility.java:99)
at com.misys.liq.LoanIQ.standardLiqEventLoop(LoanIQ.java:693)
at com.misys.liq.LoanIQ.desktopTestManualLogIn(LoanIQ.java:924)
at com.misys.liq.LoanIQ.mainClassic(LoanIQ.java:589)
at com.misys.liq.LoanIQ.main(LoanIQ.java:309)
我想到的第一件事是将我的 ui 逻辑包装在 Display.asyncExec 的可运行对象中，从而我能够修复 Win XP 中的奇怪行为。
尽管如此，我不知道内部发生了什么，也不知道我的修复是否正确。如果经历过这种 SWT 怪异现象的人能够对此有所了解，那就太好了。
最佳答案
这是一个 swt/jface 错误。此问题的解决方法是在设置实际对象之前将项目设置为 null。
aTreeViewer.setInput(null);
aTreeViewer.setInput(this.items);
关于java - Windows XP 上的 jface/swt 树刷新问题，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/14752693/