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I get the error when I add xml-apis.jar and xercesImpl.jar to the class path in the External Tools dialog and then select the Targets tab. I need these jars to run the target in the Ant buildfile. java.lang.ClassCastException: org.apache.xerces.parsers.XIncludeAwareParserConfiguration at org.apache.xerces.parsers.SAXParser.<init>(Unknown Source) at org.apache.xerces.parsers.SAXParser.<init>(Unknown Source) at org.apache.xerces.jaxp.SAXParserImpl$JAXPSAXParser.<init>(Unknown Source) at org.apache.xerces.jaxp.SAXParserImpl.<init>(Unknown Source) at org.apache.xerces.jaxp.SAXParserFactoryImpl.newSAXParser(Unknown Source) at org.apache.tools.ant.util.JAXPUtils.newSAXParser(JAXPUtils.java:205) at org.apache.tools.ant.util.JAXPUtils.getNamespaceXMLReader(JAXPUtils.java:163) at org.apache.tools.ant.helper.ProjectHelper2.parse(ProjectHelper2.java:193) at org.eclipse.ant.internal.ui.editor.utils.ProjectHelper.parse(ProjectHelper.java:526) at org.eclipse.ant.internal.ui.editor.utils.ProjectHelper.parse(ProjectHelper.java:631) at org.apache.tools.ant.taskdefs.ImportTask.execute(ImportTask.java:140) at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:275) at org.eclipse.ant.internal.ui.model.AntImportNode.configure(AntImportNode.java:70) at org.eclipse.ant.internal.ui.model.AntModel.resolveBuildfile(AntModel.java:501) at org.eclipse.ant.internal.ui.model.AntModel.parseDocument(AntModel.java:326) at org.eclipse.ant.internal.ui.model.AntModel.reconcile(AntModel.java:263) at org.eclipse.ant.internal.ui.model.AntModel.getProjectNode(AntModel.java:1383) at org.eclipse.ant.internal.ui.model.AntModel.getProjectNode(AntModel.java:1393) at org.eclipse.ant.internal.ui.AntUtil.getTargets(AntUtil.java:236) at org.eclipse.ant.internal.ui.launchConfigurations.AntTargetsTab$7.run(AntTargetsTab.java:493) at org.eclipse.jface.operation.ModalContext.runInCurrentThread(ModalContext.java:369) at org.eclipse.jface.operation.ModalContext.run(ModalContext.java:313) at org.eclipse.jface.window.ApplicationWindow$1.run(ApplicationWindow.java:763) at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:67) at org.eclipse.jface.window.ApplicationWindow.run(ApplicationWindow.java:760) at org.eclipse.ui.internal.WorkbenchWindow.run(WorkbenchWindow.java:2283) at org.eclipse.ui.internal.progress.ProgressManager$5.run(ProgressManager.java:1130) at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:67) at org.eclipse.ui.internal.progress.ProgressManager.runInUI(ProgressManager.java:1126) at org.eclipse.ant.internal.ui.launchConfigurations.AntTargetsTab.getTargets(AntTargetsTab.java:510) at org.eclipse.ant.internal.ui.launchConfigurations.AntTargetsTab.initializeFrom(AntTargetsTab.java:619) at org.eclipse.debug.ui.AbstractLaunchConfigurationTab.activated(AbstractLaunchConfigurationTab.java:343) at org.eclipse.ant.internal.ui.launchConfigurations.AntTargetsTab.activated(AntTargetsTab.java:758) at org.eclipse.debug.internal.ui.launchConfigurations.LaunchConfigurationTabGroupViewer.handleTabSelected(LaunchConfigurationTabGroupViewer.java:1143) at org.eclipse.debug.internal.ui.launchConfigurations.LaunchConfigurationTabGroupViewer$5.widgetSelected(LaunchConfigurationTabGroupViewer.java:399) at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:90) at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:66) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:928) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:952) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:937) at org.eclipse.swt.widgets.Widget.notifyListeners(Widget.java:709) at org.eclipse.swt.custom.CTabFolder.setSelection(CTabFolder.java:3171) at org.eclipse.swt.custom.CTabFolder.onMouse(CTabFolder.java:1953) at org.eclipse.swt.custom.CTabFolder$1.handleEvent(CTabFolder.java:288) at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:66) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:928) at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3348) at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:2968) at org.eclipse.jface.window.Window.runEventLoop(Window.java:820) at org.eclipse.jface.window.Window.open(Window.java:796) at org.eclipse.debug.internal.ui.launchConfigurations.LaunchConfigurationsDialog.open(LaunchConfigurationsDialog.java:1086) at org.eclipse.debug.ui.DebugUITools$1.run(DebugUITools.java:375) at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:67) at org.eclipse.debug.ui.DebugUITools.openLaunchConfigurationDialogOnGroup(DebugUITools.java:379) at org.eclipse.debug.ui.DebugUITools.openLaunchConfigurationDialogOnGroup(DebugUITools.java:321) at org.eclipse.debug.ui.actions.OpenLaunchDialogAction.run(OpenLaunchDialogAction.java:80) 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:928) at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3348) at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:2968) 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:92) at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:68) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:400) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:177) 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 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)
Thank you for the bug report. This is another manifestation of bug 143008. *** This bug has been marked as a duplicate of 143008 ***
