"Unknown canonicalizer. No handler installed for URI" with differ ent xml beans version

[Pantvaidya, Vishwajit]

I am using an open source kit that embeds xml sec java 1.2.1 with xml beans version 1.0.x. The kit uses a different version of xml beans than we do – but the 2 versions do not seem to be too different. When we try to use it the kit with our xml beans version I get the following exception at the line “XMLSignature sig = new XMLSignature(element, null)” – org.apache.xml.security.c14n.InvalidCanonicalizerException: Unknown canonicalizer. No handler installed for URI       at org.apache.xml.security.c14n.Canonicalizer.<init>(Unknown Source)       at org.apache.xml.security.c14n.Canonicalizer.getInstance(Unknown Source)       at org.apache.xml.security.signature.SignedInfo.<init>(Unknown Source)       at org.apache.xml.security.signature.XMLSignature.<init>(Unknown Source)   The moment I switch back to the original xml beans version, the error goes away. I have rebuilt most of the actual xml beans that came with the kit using our xml beans version – but the error persists.   I have debugged the code upto the point of the exception and I see that with both xml beans versions, the xml itself does have the canonicalizer uri – but the Element. getAttributeNS call returns null when our xml beans is used and then we get the exception. Any idea why/when would this happen? Is there any dependency between xml beans and xml sec or has anyone run into this before?     Thanks,   Vish.