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

["Pantvaidya, Vishwajit" <vp...@selectica.com>]

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.

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

[Sean Mullan <Se...@Sun.COM>]

Pantvaidya, Vishwajit wrote:
> 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?

It sounds as if the DOM tree is not namespace aware in the xml beans 
case. It must be namespace aware, for example you should invoke 
DocumentBuilderFactory.setNamespaceAware(true) before parsing the document.

--Sean