Debugging strange unmarshalling problems when using jaxb —02 September 2012
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 http://jaxb.java.net/guide/Unmarshalling_is_not_working__Help_.html
Unmarshaller u = ...;
// this implementation is a part of the API and convenient for trouble-shooting,
// as it prints out errors to System.out
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).