Hi Stefan,
org.xml.sax.ContentHandler interface requires instance of implementation of
org.xml.sax.Attributes interface as a parameter to startElement, not
AttributesImpl. So you there's no garantee (and no need) that attrs will be
instance of the AttributesImpl in this case.
You should always call
if (attrs instanceof AttributesImpl) {
}
in order to make sure you can perform cast to AttributesImpl class.
If you need to modify some attributes before you pass them to another
startElement, I'm afraid, you'll have to create new instance of Attributes
(probably AttributesImpl), copy all attributes from old instance and then
you can perform any changes you need. In case of AttributesImpl this can
look like:
AttributesImpl new_attrs = new AttributesImpl (attrs);
new_attrs.setAttribute (....);
new_attrs.setAttribute (....);
handler.startElement (....., new_attrs, ....);
Thanks,
Dmitry
-----Original Message-----
From: Stefan Geelen [mailto:[EMAIL PROTECTED]]
Sent: Friday, September 06, 2002 12:10
To: [EMAIL PROTECTED]
Subject: org.xml.sax.helpers.AttributesImpl throws
java.lang.ClassCastException (?)
Hi,
I finally managed to detect the problem of the java.lang.ClassCastException:
I have a regular startElement method in my handler class:
public void startElement(String namespaceURI,
String sName, // simple name (localName)
String qName, // qualified name
Attributes attrs)
throws SAXException
{
I need to check the attributes and if necessary change an attribute.
So in this method I call a private method:
this.checkFileRelatedAttributes((org.xml.sax.helpers.AttributesImpl) attrs);
I cast the attrs to a AttributesImpl class because with this class I can
easily replace an attribute using the setAttribute method.
The moment the checkFileRelatedAttributes method is called the
java.lang.ClassCastException is thrown.
I have no idea why this happens or how to solve this.
Any help/hints are welcome to find a solution.
Please note that this does work under Xalan 22D14, but not with a later
version.
Regards,
Stefan
----- Original Message -----
From: "Stefan Geelen" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>; <[EMAIL PROTECTED]>
Cc: <[EMAIL PROTECTED]>
Sent: Wednesday, September 04, 2002 9:36 PM
Subject: Re: java.lang.ClassCastException:
> Hi,
>
> Sorry for the delay (see mail July 30th below) but here it is.
>
> ----------------------
>
> Hi,
>
> I changed from version Xalan 2.2 to Xalan 2.4.D1 and now tried with 2.4.0
>
> When I process a xml (no xsl) file I get following error (see below)
>
> This happens when I execute following :
>
> transformer.transform(saxsource, new
> javax.xml.transform.sax.SAXResult(handler));
>
> This error only happens when I transform a xml file, with a xml/xsl file
> there is no problem.
>
> Any idea what causes this ?
>
> Regards,
>
> Stefan
>
>
> java.lang.ClassCastException:
> org.apache.xerces.parsers.AbstractSAXParser$AttributesProxy
> void com.xmlmill.PDXxml2pdf.startElement(java.lang.String,
> java.lang.String, java.lang.String, org.xml.sax.Attributes)
> void
>
org.apache.xalan.transformer.TransformerIdentityImpl.startElement(java.lang.
> String, java.lang.String, java.lang.String, org.xml.sax.Attributes)
> void
>
org.apache.xerces.parsers.AbstractSAXParser.startElement(org.apache.xerces.x
> ni.QName, org.apache.xerces.xni.XMLAttributes,
> org.apache.xerces.xni.Augmentations)
> void
>
org.apache.xerces.impl.XMLNamespaceBinder.handleStartElement(org.apache.xerc
> es.xni.QName, org.apache.xerces.xni.XMLAttributes,
> org.apache.xerces.xni.Augmentations, boolean)
> void
>
org.apache.xerces.impl.XMLNamespaceBinder.startElement(org.apache.xerces.xni
> .QName, org.apache.xerces.xni.XMLAttributes,
> org.apache.xerces.xni.Augmentations)
> void
>
org.apache.xerces.impl.dtd.XMLDTDValidator.startElement(org.apache.xerces.xn
> i.QName, org.apache.xerces.xni.XMLAttributes,
> org.apache.xerces.xni.Augmentations)
> boolean
> org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanStartElement()
> boolean
>
org.apache.xerces.impl.XMLDocumentScannerImpl$ContentDispatcher.scanRootElem
> entHook()
> boolean
>
org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatc
> her.dispatch(boolean)
> boolean
>
org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(boolean)
> boolean org.apache.xerces.parsers.DTDConfiguration.parse(boolean)
> void
>
org.apache.xerces.parsers.DTDConfiguration.parse(org.apache.xerces.xni.parse
> r.XMLInputSource)
> void
>
org.apache.xerces.parsers.XMLParser.parse(org.apache.xerces.xni.parser.XMLIn
> putSource)
> void
> org.apache.xerces.parsers.AbstractSAXParser.parse(org.xml.sax.InputSource)
> void
>
org.apache.xalan.transformer.TransformerIdentityImpl.transform(javax.xml.tra
> nsform.Source, javax.xml.transform.Result)
> void com.xmlmill.PDXTransform.transform()
> void com.xmlmill.applet.XMLMill.convertXMLFile(java.io.File)
> void
>
com.xmlmill.applet.XMLMill.btnConvert_actionPerformed(java.awt.event.ActionE
> vent)
> void
> com.xmlmill.applet.XMLMill$4.actionPerformed(java.awt.event.ActionEvent)
> void
> javax.swing.AbstractButton.fireActionPerformed(java.awt.event.ActionEvent)
> void
>
javax.swing.AbstractButton$ForwardActionEvents.actionPerformed(java.awt.even
> t.ActionEvent)
> void
>
javax.swing.DefaultButtonModel.fireActionPerformed(java.awt.event.ActionEven
> t)
> void javax.swing.DefaultButtonModel.setPressed(boolean)
> void
>
javax.swing.plaf.basic.BasicButtonListener.mouseReleased(java.awt.event.Mous
> eEvent)
> void java.awt.Component.processMouseEvent(java.awt.event.MouseEvent)
> void java.awt.Component.processEvent(java.awt.AWTEvent)
> void java.awt.Container.processEvent(java.awt.AWTEvent)
> void java.awt.Component.dispatchEventImpl(java.awt.AWTEvent)
> void java.awt.Container.dispatchEventImpl(java.awt.AWTEvent)
> void java.awt.Component.dispatchEvent(java.awt.AWTEvent)
> void
java.awt.LightweightDispatcher.retargetMouseEvent(java.awt.Component,
> int, java.awt.event.MouseEvent)
> boolean
>
java.awt.LightweightDispatcher.processMouseEvent(java.awt.event.MouseEvent)
> boolean java.awt.LightweightDispatcher.dispatchEvent(java.awt.AWTEvent)
> void java.awt.Container.dispatchEventImpl(java.awt.AWTEvent)
> void java.awt.Component.dispatchEvent(java.awt.AWTEvent)
> void java.awt.EventQueue.dispatchEvent(java.awt.AWTEvent)
> boolean
> java.awt.EventDispatchThread.pumpOneEventForHierarchy(java.awt.Component)
> void
> java.awt.EventDispatchThread.pumpEventsForHierarchy(java.awt.Conditional,
> java.awt.Component)
> void java.awt.EventDispatchThread.pumpEvents(java.awt.Conditional)
> void java.awt.EventDispatchThread.run()
>
>
>
>
>
> _________________________________________________________________
> Chat with friends online, try MSN Messenger: http://messenger.msn.com
>
>
>
>
> ----- Original Message -----
> From: "Joseph Kesselman" <[EMAIL PROTECTED]>
> To: <[EMAIL PROTECTED]>
> Sent: Tuesday, July 30, 2002 3:33 PM
> Subject: Re: java.lang.ClassCastException:
>
>
> > We need more details -- a more detailed exception report (if you're
using
> > the Process class, try specifying the -EDUMP option; if you're running
> > this programmatically, call the exception's printStackTrace() method)
> > and/or a small sample document/stylesheet pair which demonstrates the
> > problem -- before we can tell you much about what's happening and why.
> >
> > ______________________________________
> > Joe Kesselman / IBM Research
> >
>
