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Build ID: I20080617-2000 Steps To Reproduce: 1. Install a separate version of Ant with Ant-Contrib added under the root of the Ant directory, and change the Ant Home of Eclipse to point to that new Ant. 2. Create the following build.xml file in a Basic project (mine is not a Java project): <project name="test" basedir="." xmlns:ac="antlib:net.sf.antcontrib"> <taskdef resource="net/sf/antcontrib/antcontrib.properties" uri="antlib:net.sf.antcontrib" onerror="ignore"> <classpath> <fileset dir="${ant.home}/ant-contrib"> <include name="**/*.jar" /> </fileset> </classpath> </taskdef> </project> 3. Open up the build.xml file using the Ant Editor. Should work just fine. 4. Modify the resource to point to the full antlib.xml supplied with Ant contrib. <project name="test" basedir="." xmlns:ac="antlib:net.sf.antcontrib"> <taskdef resource="net/sf/antcontrib/antlib.xml" uri="antlib:net.sf.antcontrib" onerror="ignore"> <classpath> <fileset dir="${ant.home}/ant-contrib"> <include name="**/*.jar" /> </fileset> </classpath> </taskdef> </project> 5. Save and close the build.xml file. 6. Reopen the file with Ant Editor. It fails now. Could not open the editor: org.apache.xerces.parsers.XIncludeAwareParserConfiguration I am positive this was working in Eclipse 3.3, but is now broken on Eclipse 3.4 I got that includes the BIRT distribution. More information: Full exception: 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$JAXPSAXParser.<init>(Unknown Source) at org.apache.xerces.jaxp.SAXParserImpl.<init>(Unknown Source) at org.apache.xerces.jaxp.SAXParserFactoryImpl.newSAXParser(Unknown Source) at org.apache.tools.ant.util.JAXPUtils.newSAXParser(JAXPUtils.java:215) at org.apache.tools.ant.util.JAXPUtils.getNamespaceXMLReader(JAXPUtils.java:172) at org.apache.tools.ant.helper.ProjectHelper2.parse(ProjectHelper2.java:185) at org.apache.tools.ant.helper.ProjectHelper2.parseUnknownElement(ProjectHelper2.java:86) at org.apache.tools.ant.taskdefs.Antlib.createAntlib(Antlib.java:75) at org.apache.tools.ant.taskdefs.Definer.loadAntlib(Definer.java:429) at org.apache.tools.ant.taskdefs.Definer.execute(Definer.java:281) at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:288) at org.eclipse.ant.internal.ui.model.AntDefiningTaskNode.configure(AntDefiningTaskNode.java:86) at org.eclipse.ant.internal.ui.model.AntModel.resolveBuildfile(AntModel.java:504) at org.eclipse.ant.internal.ui.model.AntModel.parseDocument(AntModel.java:329) at org.eclipse.ant.internal.ui.model.AntModel.reconcile(AntModel.java:265) at org.eclipse.ant.internal.ui.model.AntModel.getProjectNode(AntModel.java:1386) at org.eclipse.ant.internal.ui.model.AntModel.getProjectNode(AntModel.java:1396) at org.eclipse.ant.internal.ui.editor.text.AntFoldingStructureProvider.updateFoldingRegions(AntFoldingStructureProvider.java:88) at org.eclipse.ant.internal.ui.editor.AntEditor.projectionEnabled(AntEditor.java:1243) at org.eclipse.jface.text.source.projection.ProjectionViewer.fireProjectionEnabled(ProjectionViewer.java:480) at org.eclipse.jface.text.source.projection.ProjectionViewer.enableProjection(ProjectionViewer.java:528) at org.eclipse.jface.text.source.projection.ProjectionViewer.doOperation(ProjectionViewer.java:1413) at org.eclipse.ant.internal.ui.editor.AntEditor$StatusLineSourceViewer.doOperation(AntEditor.java:215) at org.eclipse.ant.internal.ui.editor.AntEditor.createPartControl(AntEditor.java:971) at org.eclipse.ui.internal.EditorReference.createPartHelper(EditorReference.java:661) at org.eclipse.ui.internal.EditorReference.createPart(EditorReference.java:428) at org.eclipse.ui.internal.WorkbenchPartReference.getPart(WorkbenchPartReference.java:594) at org.eclipse.ui.internal.EditorReference.getEditor(EditorReference.java:266) at org.eclipse.ui.internal.WorkbenchPage.busyOpenEditorBatched(WorkbenchPage.java:2820) at org.eclipse.ui.internal.WorkbenchPage.busyOpenEditor(WorkbenchPage.java:2729) at org.eclipse.ui.internal.WorkbenchPage.access$11(WorkbenchPage.java:2721) at org.eclipse.ui.internal.WorkbenchPage$10.run(WorkbenchPage.java:2673) at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:70) at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:2668) at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:2652) at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:2643) at org.eclipse.ui.ide.IDE.openEditor(IDE.java:646) at org.eclipse.ui.ide.IDE.openEditor(IDE.java:605) at org.eclipse.jdt.internal.ui.javaeditor.EditorUtility.openInEditor(EditorUtility.java:318) at org.eclipse.jdt.internal.ui.javaeditor.EditorUtility.openInEditor(EditorUtility.java:160) at org.eclipse.jdt.ui.actions.OpenAction.run(OpenAction.java:228) at org.eclipse.jdt.ui.actions.OpenAction.run(OpenAction.java:207) at org.eclipse.jdt.ui.actions.SelectionDispatchAction.dispatchRun(SelectionDispatchAction.java:274) at org.eclipse.jdt.ui.actions.SelectionDispatchAction.run(SelectionDispatchAction.java:250) at org.eclipse.jdt.internal.ui.packageview.PackageExplorerActionGroup.handleOpen(PackageExplorerActionGroup.java:363) at org.eclipse.jdt.internal.ui.packageview.PackageExplorerPart$5.open(PackageExplorerPart.java:603) at org.eclipse.jface.viewers.StructuredViewer$2.run(StructuredViewer.java:820) at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:37) at org.eclipse.core.runtime.Platform.run(Platform.java:880) at org.eclipse.ui.internal.JFaceUtil$1.run(JFaceUtil.java:48) at org.eclipse.jface.util.SafeRunnable.run(SafeRunnable.java:175) at org.eclipse.jface.viewers.StructuredViewer.fireOpen(StructuredViewer.java:818) at org.eclipse.jface.viewers.StructuredViewer.handleOpen(StructuredViewer.java:1079) at org.eclipse.jface.viewers.StructuredViewer$6.handleOpen(StructuredViewer.java:1183) at org.eclipse.jface.util.OpenStrategy.fireOpenEvent(OpenStrategy.java:263) at org.eclipse.jface.util.OpenStrategy.access$2(OpenStrategy.java:257) at org.eclipse.jface.util.OpenStrategy$1.handleEvent(OpenStrategy.java:297) at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1003) at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3823) at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3422) at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2382) at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2346) at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2198) at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:493) at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:288) at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:488) at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149) at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:113) at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:193) at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:110) at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:79) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:382) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:179) 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.equinox.launcher.Main.invokeFramework(Main.java:549) at org.eclipse.equinox.launcher.Main.basicRun(Main.java:504) at org.eclipse.equinox.launcher.Main.run(Main.java:1236)
You are getting 2 versions of Xerces loaded resulting in the ClassCastException. If you remove the xerces JARs (xercesImpl.jar and xml-apis.jar) from the Ant runtime classpath this will work as you expect.
same problem and workaround as bug 196346, marking as dupe *** This bug has been marked as a duplicate of bug 196346 ***
