[Soot-list] How to combine two method into one

[csytang]

Hi,all 
 I want to combine two method (method1 and method2) into another
method3, 

 	* All these methods share same name, and parameters, but in different
classes.

 I use method 'importBodyContentsFrom' to create method3's body using
method1, but when I use this function to import method2's body to
method3, it incurs problem "java.lang.IllegalArgumentException: value
may not be null". Is that a right way of using it? Or, any other
suggestions for my work? 
 Thanks in advance. 
Best 
Chris. 
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