The detail description of this ticket can be seen through url:
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?