Concept.log shoule not be null when we deserialize a concept from a xml file

The detail description of this ticket can be seen through url:
http://n2.nabble.com/Deserializing-the-Log-Property-on-Concept-class-tc3904744.html#none

And now, the only method which i have know is that adding a method "readResolve" in class "Concept". And in "readResolve", i will reassign Concept.log with value "LogFactory.getLog(this.getClass());"

But, i think maybe this resolution is a bit ugly, because it will modify the Code Base of Openmrs branch.

So anyone have idea with this question?