Bug 155575 [Viewers] IllegalArgumentException while viewing preference page
I've started getting IllegalArgumentExceptions when viewing certain preference pages. ex: the experimental keybinding page or Java>Editors>Content Assist>Advanced java.lang.IllegalArgumentException: Argument cannot be null at org.eclipse.swt.SWT.error(SWT.java:3358) at org.eclipse.swt.SWT.error(SWT.java:3297) at org.eclipse.swt.SWT.error(SWT.java:3268) at org.eclipse.swt.widgets.Widget.error(Widget.java:434) at org.eclipse.swt.widgets.TableItem.setText(TableItem.java:1148) at org.eclipse.jface.viewers.TableViewerRow.setText(TableViewerRow.java:138) at org.eclipse.jface.viewers.ViewerCell.setText(ViewerCell.java:114) at org.eclipse.jface.viewers.ViewerColumn.refresh(ViewerColumn.java:98) at org.eclipse.jface.viewers.TableViewer.doUpdateItem(TableViewer.java:368) at org.eclipse.jface.viewers.StructuredViewer$UpdateItemSafeRunnable.run(StructuredViewer.java:465) at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:37) at org.eclipse.core.runtime.Platform.run(Platform.java:843) at org.eclipse.ui.internal.JFaceUtil$1.run(JFaceUtil.java:44) at org.eclipse.jface.util.SafeRunnable.run(SafeRunnable.java:149) at org.eclipse.jface.viewers.StructuredViewer.updateItem(StructuredViewer.java:1955) at org.eclipse.jface.viewers.TableViewer.internalRefreshAll(TableViewer.java:790) at org.eclipse.jface.viewers.TableViewer.internalRefresh(TableViewer.java:727) at org.eclipse.jface.viewers.TableViewer.internalRefresh(TableViewer.java:714) at org.eclipse.jface.viewers.StructuredViewer$7.run(StructuredViewer.java:1388) at org.eclipse.jface.viewers.StructuredViewer.preservingSelection(StructuredViewer.java:1323) at org.eclipse.jface.viewers.CheckboxTableViewer.preservingSelection(CheckboxTableViewer.java:295) at org.eclipse.jface.viewers.StructuredViewer.refresh(StructuredViewer.java:1386) at org.eclipse.jface.viewers.StructuredViewer.refresh(StructuredViewer.java:1345) at org.eclipse.jdt.internal.ui.preferences.CodeAssistAdvancedConfigurationBlock.updateControls(CodeAssistAdvancedConfigurationBlock.java:627) at org.eclipse.jdt.internal.ui.preferences.CodeAssistAdvancedConfigurationBlock.createContents(CodeAssistAdvancedConfigurationBlock.java:377) at org.eclipse.jdt.internal.ui.preferences.CodeAssistAdvancedPreferencePage.createPreferenceContent(CodeAssistAdvancedPreferencePage.java:36) at org.eclipse.jdt.internal.ui.preferences.PropertyAndPreferencePage.createContents(PropertyAndPreferencePage.java:149) at org.eclipse.jface.preference.PreferencePage.createControl(PreferencePage.java:233) at org.eclipse.jdt.internal.ui.preferences.CodeAssistAdvancedPreferencePage.createControl(CodeAssistAdvancedPreferencePage.java:31) at org.eclipse.jface.preference.PreferenceDialog.createPageControl(PreferenceDialog.java:1403) at org.eclipse.jface.preference.PreferenceDialog$12.run(PreferenceDialog.java:1162) at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:37) at org.eclipse.core.runtime.Platform.run(Platform.java:843) at org.eclipse.ui.internal.JFaceUtil$1.run(JFaceUtil.java:44) at org.eclipse.jface.util.SafeRunnable.run(SafeRunnable.java:149) at org.eclipse.jface.preference.PreferenceDialog.showPage(PreferenceDialog.java:1156) at org.eclipse.ui.internal.dialogs.FilteredPreferenceDialog.showPage(FilteredPreferenceDialog.java:439) at org.eclipse.jface.preference.PreferenceDialog$8.selectionChanged(PreferenceDialog.java:661) at org.eclipse.jface.viewers.StructuredViewer$3.run(StructuredViewer.java:839) at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:37) at org.eclipse.core.runtime.Platform.run(Platform.java:843) at org.eclipse.ui.internal.JFaceUtil$1.run(JFaceUtil.java:44) at org.eclipse.jface.util.SafeRunnable.run(SafeRunnable.java:149) at org.eclipse.jface.viewers.StructuredViewer.firePostSelectionChanged(StructuredViewer.java:837) at org.eclipse.jface.viewers.StructuredViewer.handlePostSelect(StructuredViewer.java:1143) at org.eclipse.jface.viewers.StructuredViewer$5.widgetSelected(StructuredViewer.java:1163) at org.eclipse.jface.util.OpenStrategy.firePostSelectionEvent(OpenStrategy.java:236) at org.eclipse.jface.util.OpenStrategy.access$4(OpenStrategy.java:230) at org.eclipse.jface.util.OpenStrategy$3.run(OpenStrategy.java:404) at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:35) at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:123) at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:3170) at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:2872) at org.eclipse.jface.window.Window.runEventLoop(Window.java:820) at org.eclipse.jface.window.Window.open(Window.java:796) at org.eclipse.ui.internal.OpenPreferencesAction.run(OpenPreferencesAction.java:65) at org.eclipse.jface.action.Action.runWithEvent(Action.java:499) at org.eclipse.jface.action.ActionContributionItem.handleWidgetSelection(ActionContributionItem.java:539) at org.eclipse.jface.action.ActionContributionItem.access$2(ActionContributionItem.java:488) at org.eclipse.jface.action.ActionContributionItem$5.handleEvent(ActionContributionItem.java:400) at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:66) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1085) at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3193) at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:2869) at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:1914) at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:1878) at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:419) at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149) at org.eclipse.ui.internal.ide.IDEApplication.run(IDEApplication.java:95) at org.eclipse.core.internal.runtime.PlatformActivator$1.run(PlatformActivator.java:78) at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:104) at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:74) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:401) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:177) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:324) at org.eclipse.core.launcher.Main.invokeFramework(Main.java:336) at org.eclipse.core.launcher.Main.basicRun(Main.java:280) at org.eclipse.core.launcher.Main.run(Main.java:977) at org.eclipse.core.launcher.Main.main(Main.java:952) eclipse.buildId=I20060807-2000 java.version=1.4.2_08 java.vendor=Sun Microsystems Inc. BootLoader constants: OS=linux, ARCH=x86, WS=gtk, NL=en_US Command-line arguments: -os linux -ws gtk -arch x86 -data /opt/pwebster/workspaces/general320
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/TreeViewerRow.java
private TreeItem item;
	
	/**
	 * Create a new instance of the receiver.
	 * @param item
	 */
	TreeViewerRow(TreeItem item) {