does oozie mapreduce action not support setting main class ?

[王猛]

Hi :

I want to run my MapReduce job as part of an Oozie workflow, but all of
 the <map-reduce> examples I can find seem to set mapred.mapper.class and
 mapred.reducer.class in the <configuration/>, rather than just
specifying a main class to run that does all this.

 Is there some configuration option I’m missing, or should I be using a
 <java> action for this ? Thanks.