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EJB Specification doubt

 
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The container serializes calls to each message-driven bean instance. Most containers will support many instances of a message-driven bean executing concurrently; however, each instance sees only a serialized sequence of method calls. Therefore, a message-driven bean does not have to be coded as reentrant.

I read this statement multiple times and could not understand. can any one please explain this.
 
Deepak Jain
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Please take time to respond to this question.
 
Deepak Jain
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Experts/Ranchers, Please take time and reply.
 
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