javap bytecode listing of xercesImpl.jar which i have that is packaged with 
$ANT_HOME/lib/xercesImpl.jar

09/08/2009  07:16 PM         1,223,877 xercesImpl.jar

public class org.apache.xerces.util.XMLAttributesImpl extends java.lang.Object i
mplements org.apache.xerces.xni.XMLAttributes{
    protected static final int TABLE_SIZE;
    protected static final int SIZE_LIMIT;
    protected boolean fNamespaces;
    protected int fLargeCount;
    protected int fLength;
    protected org.apache.xerces.util.XMLAttributesImpl$Attribute[] fAttributes;
    protected org.apache.xerces.util.XMLAttributesImpl$Attribute[] fAttributeTab
leView;
    protected int[] fAttributeTableViewChainState;
    protected int fTableViewBuckets;
    protected boolean fIsTableViewConsistent;
    public org.apache.xerces.util.XMLAttributesImpl();
    public org.apache.xerces.util.XMLAttributesImpl(int);
    public void setNamespaces(boolean);
    public int addAttribute(org.apache.xerces.xni.QName, java.lang.String, java.
lang.String);
    public void removeAllAttributes();
    public void removeAttributeAt(int);
    public void setName(int, org.apache.xerces.xni.QName);
    public void getName(int, org.apache.xerces.xni.QName);
    public void setType(int, java.lang.String);
    public void setValue(int, java.lang.String);
    public void setNonNormalizedValue(int, java.lang.String);
    public java.lang.String getNonNormalizedValue(int);
    public void setSpecified(int, boolean);
    public boolean isSpecified(int);
    public int getLength();
    public java.lang.String getType(int);
    public java.lang.String getType(java.lang.String);
    public java.lang.String getValue(int);
    public java.lang.String getValue(java.lang.String);
    public java.lang.String getName(int);
    public int getIndex(java.lang.String);
    public int getIndex(java.lang.String, java.lang.String);
    public java.lang.String getLocalName(int);
    public java.lang.String getQName(int);
    public java.lang.String getType(java.lang.String, java.lang.String);
    public java.lang.String getPrefix(int);
    public java.lang.String getURI(int);
    public java.lang.String getValue(java.lang.String, java.lang.String);
    public org.apache.xerces.xni.Augmentations 
getAugmentations(java.lang.String, java.lang.String);
    public org.apache.xerces.xni.Augmentations 
getAugmentations(java.lang.String);
    public org.apache.xerces.xni.Augmentations getAugmentations(int);
    public void setAugmentations(int, org.apache.xerces.xni.Augmentations);
    public void setURI(int, java.lang.String);
    public void setSchemaId(int, boolean);
    public boolean getSchemaId(int);
    public boolean getSchemaId(java.lang.String);
    public boolean getSchemaId(java.lang.String, java.lang.String);
    public int getIndexFast(java.lang.String);
    public void addAttributeNS(org.apache.xerces.xni.QName, java.lang.String, 
java.lang.String);
    public org.apache.xerces.xni.QName checkDuplicatesNS();
    public int getIndexFast(java.lang.String, java.lang.String);
    protected int getTableViewBucket(java.lang.String);
    protected int getTableViewBucket(java.lang.String, java.lang.String);
    protected void cleanTableView();
    protected void prepareTableView();
    protected void prepareAndPopulateTableView();
}

perhaps you can verify the signatures your are calling versus the signatures of 
the methods of $APACHE_HOME/lib/xercesImpl.jar
if you detect a mismatch in method signatues you may want to rename the bad 
xerces jar
then install the valid xerces jar into $APACHE_HOME/lib

?
Martin 
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> Subject: Classpath and taskdef
> Date: Tue, 17 Nov 2009 13:49:31 +0100
> From: juergen.knuple...@icongmbh.de
> To: user@ant.apache.org
> 
> Hello,
> 
> I created a task called dope-task. This task gets the following exception, 
> but only when I use Ant.
> I have the same functionality without Ant and everything works fine.
> 
> I fear that this is a classptah issue.
> 
> It happen s when parsing XML. I want to use the xmlparser of Java 1.6.0_17, 
> but it seems,
> Zhat the Ant xml parser is used.
> Is Ant adding his own classpath to the classptah of the task?
> 
> Or any other idea?
> 
> [dope-task] 398.) Font: C0N400Z0 -1 (durch Datei-Version -1 ersetzt.)
> [dope-task] 399.) JavaScript: DJSF9236 -1 (durch Datei-Version -1 ersetzt.)
> [dope-task] 400.) Font: C0N20090 -1 (durch Datei-Version -1 ersetzt.)
> [dope-task] 2009-11-16 21:45:55.579 [E] 
> de.icongmbh.dope.util.reload.ReloadManager $Revision: 1.315 $ execute() main 
> [dope-task]   java.lang.ArrayIndexOutOfBoundsException: -1
> [dope-task]   at 
> com.sun.org.apache.xerces.internal.util.XMLAttributesImpl.addAttribute(XMLAttributesImpl.java:310)
> [dope-task]   at 
> com.sun.org.apache.xerces.internal.util.XMLAttributesImpl.addAttribute(XMLAttributesImpl.java:216)
> [dope-task]   at 
> com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaValidator.addDefaultAttributes(XMLSchemaValidator.java:2868)
> [dope-task]   at 
> com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaValidator.handleStartElement(XMLSchemaValidator.java:2041)
> [dope-task]   at 
> com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaValidator.startElement(XMLSchemaValidator.java:685)
> [dope-task]   at 
> com.sun.org.apache.xerces.internal.jaxp.validation.ValidatorHandlerImpl.startElement(ValidatorHandlerImpl.java:549)
> [dope-task]   at 
> org.apache.xerces.jaxp.JAXPValidatorComponent$XNI2SAX.startElement(Unknown 
> Source)
> [dope-task]   at 
> org.apache.xerces.jaxp.JAXPValidatorComponent.startElement(Unknown Source)
> [dope-task]   at 
> org.apache.xerces.jaxp.JAXPValidatorComponent.emptyElement(Unknown Source)
> [dope-task]   at 
> org.apache.xerces.impl.XMLNSDocumentScannerImpl.scanStartElement(Unknown 
> Source)
> [dope-task]   at 
> org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Unknown
>  Source)
> [dope-task]   at 
> org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown 
> Source)
> [dope-task]   at org.apache.xerces.parsers.XML11Configuration.parse(Unknown 
> Source)
> [dope-task]   at org.apache.xerces.parsers.XML11Configuration.parse(Unknown 
> Source)
> [dope-task]   at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
> [dope-task]   at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown 
> Source)
> [dope-task]   at 
> org.apache.xerces.jaxp.SAXParserImpl$JAXPSAXParser.parse(Unknown Source)
> [dope-task]   at org.apache.xerces.jaxp.SAXParserImpl.parse(Unknown Source)
> [dope-task]   at 
> de.icongmbh.dope.util.reload.ReloadManager.createRepositoryObjects(ReloadManager.java:1475)
> [dope-task]   at 
> de.icongmbh.dope.util.reload.ReloadManager.execute(ReloadManager.java:323)
> [dope-task]   at 
> de.icongmbh.dope.util.ant.ReloadTask$1.execute(ReloadTask.java:47)
> [dope-task]   at 
> de.icongmbh.dope.util.ant.SaveFormatTask.execute(SaveFormatTask.java:106)
> [dope-task]   at 
> org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:288)
> [dope-task]   at sun.reflect.GeneratedMethodAccessor42.invoke(Unknown Source)
> [dope-task]   at 
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
> [dope-task]   at java.lang.reflect.Method.invoke(Method.java:597)
> [dope-task]   at 
> org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)
> [dope-task]   at org.apache.tools.ant.Task.perform(Task.java:348)
> [dope-task]   at org.apache.tools.ant.Target.execute(Target.java:357)
> [dope-task]   at org.apache.tools.ant.Target.performTasks(Target.java:385)
> [dope-task]   at 
> org.apache.tools.ant.Project.executeSortedTargets(Project.java:1337)
> [dope-task]   at org.apache.tools.ant.Project.executeTarget(Project.java:1306)
> [dope-task]   at 
> net.sf.antcontrib.logic.RunTargetTask.execute(RunTargetTask.java:48)
> [dope-task]   at 
> org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:288)
> [dope-task]   at sun.reflect.GeneratedMethodAccessor42.invoke(Unknown Source)
> [dope-task]   at 
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
> [dope-task]   at java.lang.reflect.Method.invoke(Method.java:597)
> [dope-task]   at 
> org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)
> [dope-task]   at org.apache.tools.ant.Task.perform(Task.java:348)
> [dope-task]   at 
> org.apache.tools.ant.taskdefs.Sequential.execute(Sequential.java:62)
> [dope-task]   at 
> org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:288)
> [dope-task]   at sun.reflect.GeneratedMethodAccessor42.invoke(Unknown Source)
> [dope-task]   at 
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
> [dope-task]   at java.lang.reflect.Method.invoke(Method.java:597)
> [dope-task]   at 
> org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)
> [dope-task]   at org.apache.tools.ant.Task.perform(Task.java:348)
> [dope-task]   at 
> org.apache.tools.ant.taskdefs.MacroInstance.execute(MacroInstance.java:394)
> [dope-task]   at 
> net.sf.antcontrib.logic.ForTask.doSequentialIteration(ForTask.java:259)
> [dope-task]   at net.sf.antcontrib.logic.ForTask.doToken(ForTask.java:268)
> [dope-task]   at net.sf.antcontrib.logic.ForTask.doTheTasks(ForTask.java:299)
> [dope-task]   at net.sf.antcontrib.logic.ForTask.execute(ForTask.java:244)
> [dope-task]   at 
> org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:288)
> [dope-task]   at sun.reflect.GeneratedMethodAccessor42.invoke(Unknown Source)
> 
> Greetings Juergen
> 
> -- 
> Jürgen Knuplesch                    www.icongmbh.de
> icon Systemhaus GmbH                Tel. +49 711 806098-275
> Sophienstraße 40                    
> D-70178 Stuttgart                   Fax. +49 711 806098-299
> 
> Geschäftsführer: Uwe Seltmann
> HRB Stuttgart 17655
> USt-IdNr.: DE 811944121 
> 
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