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I get the following exception when trying to open my build file. The file opened fine in 3.1. Here is the stack trace... java.lang.ClassCastException: org.apache.xerces.parsers.XML11Configuration at org.apache.xerces.parsers.SAXParser.<init>(Unknown Source) at org.apache.xerces.parsers.SAXParser.<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.apache.tools.ant.helper.ProjectHelper2.parseUnknownElement(ProjectHelper2.java:88) at org.apache.tools.ant.taskdefs.Antlib.createAntlib(Antlib.java:75) at org.apache.tools.ant.taskdefs.Definer.loadAntlib(Definer.java:327) at org.apache.tools.ant.taskdefs.Definer.execute(Definer.java:236) at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:275) at org.eclipse.ant.internal.ui.model.AntDefiningTaskNode.configure(AntDefiningTaskNode.java:86) 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.editor.text.AntFoldingStructureProvider.updateFoldingRegions(AntFoldingStructureProvider.java:88) at org.eclipse.ant.internal.ui.editor.AntEditor.projectionEnabled(AntEditor.java:1370) at org.eclipse.jface.text.source.projection.ProjectionViewer.fireProjectionEnabled(ProjectionViewer.java:481) at org.eclipse.jface.text.source.projection.ProjectionViewer.enableProjection(ProjectionViewer.java:529) at org.eclipse.jface.text.source.projection.ProjectionViewer.doOperation(ProjectionViewer.java:1429) at org.eclipse.ant.internal.ui.editor.AntEditor$StatusLineSourceViewer.doOperation(AntEditor.java:302) at org.eclipse.ant.internal.ui.editor.AntEditor.createPartControl(AntEditor.java:1103) at org.eclipse.ui.internal.EditorReference.createPartHelper(EditorReference.java:596) at org.eclipse.ui.internal.EditorReference.createPart(EditorReference.java:372) at org.eclipse.ui.internal.WorkbenchPartReference.getPart(WorkbenchPartReference.java:566) at org.eclipse.ui.internal.EditorReference.getEditor(EditorReference.java:214) at org.eclipse.ui.internal.WorkbenchPage.busyOpenEditorBatched(WorkbenchPage.java:2588) at org.eclipse.ui.internal.WorkbenchPage.busyOpenEditor(WorkbenchPage.java:2521) at org.eclipse.ui.internal.WorkbenchPage.access$10(WorkbenchPage.java:2513) at org.eclipse.ui.internal.WorkbenchPage$9.run(WorkbenchPage.java:2498)
Thank you for the bug report. https://bugs.eclipse.org/bugs/show_bug.cgi?id=143008#c6 contains the workaround. *** This bug has been marked as a duplicate of 152793 ***
