Exception in generating a new transformer

When switching to jre 1.4.2 I have a problem to generate a new transformer
using:

TransformerFactory transformerFactory =
      javax.xml.transform.TransformerFactory.newInstance();
Source xsl = new StreamSource(...);
transformerFactory.newTransformer(xsl);

The exception thrown is ConfigurationTransformerExcpetion: A location step
was expected following the '/' or '//' token.

This exception does not occur in earlier JDKs and in any case it occurs
only for part of my XSL files.

Is there a change in the XSL format that causes this exception?



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