This week's book giveaway is in the OCPJP forum. We're giving away four copies of OCA/OCP Java SE 7 Programmer I & II Study Guide and have Kathy Sierra & Bert Bates on-line! See this thread for details.
I see that the createDocumentBuilderFactory method of the org.springframework.beans.factory.xml.DefaultDocumentLoader class returns Weblogic's Document builder factory.
When an app is deployed to Tomcat, the standard com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderFactoryImpl is returned and everything works fine after that.
Wondering if this may be the root of the problem...