The other day I had a very strange unmarshalling issue with jaxb: unmarshalling (deserializing) from an XML file and then marshalling (serializing) the same object to another XML file resulted in different content. There were no errors thrown in the process and I had no idea as to why.

Finally I found a way to debug it on this page

Unmarshaller u = ...;
// this implementation is a part of the API and convenient for trouble-shooting,
// as it prints out errors to System.out
u.setEventHandler(new javax.xml.bind.helpers.DefaultValidationEventHandler());

u.unmarshal(new File("foo.xml"));

Based on the errors reported by the event handler it was straightforward to fix the problem (some property files that relax some validation rules were not on the classpath).

blog comments powered by Disqus