XSLT errors in JBoss Fuse 6.1

Issue

We are encountering the following error when using XLST in camel:

2014-02-21 18:32:57,470 | ERROR | #3 - timer://foo | DefaultErrorHandler              | ?                                   ? | 86 - org.apache.camel.camel-core - 2.12.0.redhat-610328 | Failed delivery for (MessageId: ID-test on ExchangeId: ID-test). Exhausted after delivery attempt: 1 caught: org.apache.xml.dtm.DTMException: Not supported: javax.xml.transform.stax.StAXSource@c3cbc2

org.apache.xml.dtm.DTMException: Not supported: javax.xml.transform.stax.StAXSource@c3cbc2
    at org.apache.xml.dtm.ref.DTMManagerDefault.getDTM(DTMManagerDefault.java:477)[:]
    at org.apache.xalan.transformer.TransformerImpl.transform(TransformerImpl.java:699)[:]
    at org.apache.xalan.transformer.TransformerImpl.transform(TransformerImpl.java:1273)[:]
    at org.apache.xalan.transformer.TransformerImpl.transform(TransformerImpl.java:1251)[:]
    at org.apache.camel.builder.xml.XsltBuilder.process(XsltBuilder.java:128)[86:org.apache.camel.camel-core:2.12.0.redhat-610328]
    at org.apache.camel.impl.ProcessorEndpoint.onExchange(ProcessorEndpoint.java:103)[86:org.apache.camel.camel-core:2.12.0.redhat-610328]