Debugging Model Manager in SUN with Log4j

[Harry]

I want to use log4j to debug the jar file. Does anyone has experience with it? I made a class and implemented log4j code in it.
When I start run_mm, I got the following output:

create_mm_startup:
create_dm_startup:
create_start_mm:
create_start_mm_debug:
Creating start_mm script with debug...
create_policy:
all:
initializing: System.out = on
java.lang.NoSuchMethodError
at com.CoCreate.toolbox.debug.Debug.initializeDefaultLogging(Unknown Source)
at com.CoCreate.framework.client.ClientMain.initializeLogging(Unknown Source)
at com.CoCreate.framework.client.ClientMain.main(Unknown Source)
Exception in thread "main"
com/osm/tools/run_mm.xml [24] Java returned: 1
BUILD FAILED
Total time: 4 seconds

Any idea what's going on?