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EJB 3 in Action : @Resource Annotation doubt

 
Aditya Vasudeva
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What does "using @Resource at the class level mean"?

That is, when this annotation is used as a @TYPE-field, it says that to look up a resource in a helper class, we have to use JNDI.

Also, what is a helper class? And, when @Resource is used for setter or getter methods, is the actual resource we want to inject obtained through the arguments/return-types?

This is described in EJB3 in Action on page 150.
 
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