xx ejb with xml dd(deployment-descriptor)

–val@dd for learning purpose
 
 
 
for beginners, source code could be too much to swallow.
 
dd xml format is very structured, concise compared to source code, which contains lots of seemingly “useless” code.
 
relationships between several java objects are not clear by reading source code. dd is better.
 
many critical infrastructure pieces are not defined in source code.

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