What does this error mean - "Class org/w3c/dom/Node violates loader constraints" ?

[Krysty Sullivan]

What does "Class org/w3c/dom/Node violates loader constraints" mean? I've encountered this error while transforming a Document obj and displaying it thru "out". I noticed that this error occurs during transformation of document to a certain output/result. Please see the code below:
TransformerFactory tFactory =
TransformerFactory.newInstance();
Transformer transformer = tFactory.newTransformer
();
transformer.transform(new DOMSource(objXML), new
StreamResult(out)); //Error occurs at this
point.
Could it be that the Document objXML that I'm going to transform is not in the correct format or something like that?
What are the possible solutions regarding this error? Thanks!

[Danl Thompson]

Hey Wendy, how's it going? I'm also having trouble with "violates loader constraints". What J2EE server are you using? Or is it just a java app? What JVM are you using?
Typically this is caused by having multiple different versions of the same jar (xalan, xerces, etc.) in the classpath. So it is finding org.w3c.dom.Node in more than one jar.
Dan'l

[Krysty Sullivan]

Hi Danl! => Sorry but I'm not Wendy. I checked out my jar files and remove some which contained the same classes. Nway, thanks for your tip, it really helped me! God bless!