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Get a reference to an existing entity object's component interface

 
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I am studing EJB and get a question on the following question

Which are ways in which a client can get a reference to an existing entity object's local component interface

1. call ejbCreate
2. object eht reference from the handle
3. receive the reference as a parameter in a method call

the answer is 3.

I understand it cannot be 1 and 2. But why 3?
 
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