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Obtaining a PersistenceContext in Java EE

 
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Guys,

What is the deal with obtaining a PersistenceContext using @PersistencContext annotation and what difference or a performance overhead it is when I say the following,



 
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the first one is managed by the application and the second one by container.

So you can conclude the container managed persistence context is more efficient in it's operation's.
 
Joe San
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But even in the line,



it is the contaner that performs the DI. So dosn't that mean that it is managed by the container?
 
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In this case the entity manager factory is managed by the container, but not the entity manager itself.

As a remark concerning performance aspects: I was once told on glassfish forum that creating an entity manager is a lightweight operation.
 
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