It was happening with me too, but I perceived that both librarys was being used by maven. It was happening because two of my libraries has a dependency to this version of xerces. Im my case the problematic libraries was commons-pool and commons-dbcp.
To solve the problem I changed the version of commons-pool to another more new that donīt have this dependency and I have to make a little change in the pom of commons-dbcp and put the dependecy to xerces as optional. I know that it is a very durty solution, but i actualy need to use these libraries. If somebody knows another solution I will be very apreciate.
Thanks