For this web application under Tomcat, the standard practice is to drop the xerces and xalan XML parsers into Tomcat's endorsed directory, if this error shows up in the logs and the webapp won't start:
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OpenSAML requires an xml parser that supports JAXP 1.3 and DOM3.
The JVM is currently configured to use the Sun XML parser, which is known
to be buggy and can not be used with OpenSAML. Please endorse a functional
JAXP library(ies) such as Xerces and Xalan. For instructions on how to endorse
a new parser see
http://java.sun.com/j2se/1.5.0/docs/guide/standards/index.html
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