Problem with Ant editor in eclipse

[Hein Meling <meling@acm.org>]

Hi *,

  For a while I've been unable to use the built-in ant editor in
eclipse.  Trying to open a build.xml file, eclipse reports an error
"Unable to create part: Ant Editor".

  The log file contains the attached exception, which I believe is
related to the problem.  I also think that maybe the new ant version 1.6
is causing the problem, although I have yet to verify this.  I'm using
debian unstable.

  Anyone else have this problem?  Is there a known solution?  I could
not find anything on google.

Thanks,

  Hein

!SESSION Apr 06, 2004 10:35:38.675 ---------------------------------------------
java.version=1.4.2
java.vendor=Sun Microsystems Inc.
BootLoader constants: OS=linux, ARCH=x86, WS=gtk, NL=en_US
Command-line arguments: -ws gtk -os linux -arch x86 -data /home/meling/eclipse -addsite /home/meling/.eclipse/user.links -install file:/usr/share/eclipse/
!ENTRY org.eclipse.ui.workbench 4 2 Apr 06, 2004 10:35:38.677
!MESSAGE Problems occurred when invoking code from plug-in: "org.eclipse.ui.workbench".
!STACK 0
java.lang.NoClassDefFoundError: org/apache/tools/ant/BuildException
        at org.eclipse.ui.externaltools.internal.ant.editor.PlantySourceViewerConfiguration.getContentAssistant(PlantySourceViewerConfiguration.java:74)
        at org.eclipse.jface.text.source.SourceViewer.configure(SourceViewer.java:249)
        at org.eclipse.ui.texteditor.AbstractTextEditor.createPartControl(AbstractTextEditor.java:1960)
        at org.eclipse.ui.texteditor.StatusTextEditor.createPartControl(StatusTextEditor.java:53)
        at org.eclipse.ui.editors.text.TextEditor.createPartControl(TextEditor.java:746)
        at org.eclipse.ui.internal.PartPane$4.run(PartPane.java:141)
        at org.eclipse.core.internal.runtime.InternalPlatform.run(InternalPlatform.java:1006)
        at org.eclipse.core.runtime.Platform.run(Platform.java:413)
        at org.eclipse.ui.internal.PartPane.createChildControl(PartPane.java:137)
        at org.eclipse.ui.internal.PartPane.createControl(PartPane.java:186)
        at org.eclipse.ui.internal.EditorWorkbook.createPage(EditorWorkbook.java:387)
        at org.eclipse.ui.internal.EditorWorkbook.add(EditorWorkbook.java:123)
        at org.eclipse.ui.internal.EditorArea.addEditor(EditorArea.java:55)
        at org.eclipse.ui.internal.EditorPresentation.openEditor(EditorPresentation.java:351)
        at org.eclipse.ui.internal.EditorManager$2.run(EditorManager.java:585)
        at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:69)
        at org.eclipse.ui.internal.EditorManager.createEditorTab(EditorManager.java:574)
        at org.eclipse.ui.internal.EditorManager.openInternalEditor(EditorManager.java:668)
        at org.eclipse.ui.internal.EditorManager.openEditorFromDescriptor(EditorManager.java:459)
        at org.eclipse.ui.internal.EditorManager.openEditor(EditorManager.java:431)
        at org.eclipse.ui.internal.WorkbenchPage.busyOpenEditor(WorkbenchPage.java:2054)
        at org.eclipse.ui.internal.WorkbenchPage.access$700(WorkbenchPage.java:91)
        at org.eclipse.ui.internal.WorkbenchPage$9.run(WorkbenchPage.java:1991)
        at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:69)
        at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:1986)
        at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:1879)
        at org.eclipse.ui.actions.OpenWithMenu.openEditor(OpenWithMenu.java:237)
        at org.eclipse.ui.actions.OpenWithMenu.access$000(OpenWithMenu.java:45)
        at org.eclipse.ui.actions.OpenWithMenu$2.handleEvent(OpenWithMenu.java:155)
        at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:81)
        at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:923)
        at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:1847)
        at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:1639)
        at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:1402)
        at org.eclipse.ui.internal.Workbench.run(Workbench.java:1385)
        at org.eclipse.core.internal.boot.InternalBootLoader.run(InternalBootLoader.java:858)
        at org.eclipse.core.boot.BootLoader.run(BootLoader.java:461)
        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.basicRun(Main.java:291)
        at org.eclipse.core.launcher.Main.run(Main.java:747)
        at org.eclipse.core.launcher.Main.main(Main.java:583)