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Class level annotations in EJB3

Vish Shukla
Ranch Hand

Joined: Oct 12, 2008
Posts: 111
Hi all,

I am new to EJBs. I am able to properly understand what exactly class level annotations for @Resource, @EJB & @PersistenceContext does and why these annotations exist. What I have understood yet is we need to use these annotations at Class/Type level when we want to manually lookup that resource/ejb.

It would be great if someone can elaborate this in detail. Thanks in advance.


Thanks & Regards,
Vishal S Shukla (SCJP 93%, SCWCD 94%, SCBCD 100%)
Jaikiran Pai
Marshal

Joined: Jul 20, 2005
Posts: 10264
    
168

Does this help?


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Vish Shukla
Ranch Hand

Joined: Oct 12, 2008
Posts: 111
What I am getting here is, using these, say @EJB, annotation at class level, we are creating one entry in the ENC of the containing bean & to map actual bean(instance) with this entry, we may directly link it by referring to another JNDI entry or by pointing to that EJB. Which can be done either by using "beanInterface" element in @EJB or by specifying <ejb-link> element in DD. Is this understanding correct?

One more thing I want to know is,
1. Is there any advantage of using this(class level) approach over DD?
2. What could be the consequences of using annotations at class level over using <ejb-ref>/<resource-ref> entries in the DD & vice-versa.

aze opuiy
Greenhorn

Joined: Dec 03, 2010
Posts: 4
Hello,

I didn't see this question, so i have posted a new one around the same subject :
http://www.coderanch.com/t/519214/EJB-JEE/java/Class-Type-level-resource-annotation

Sorry for that.

I don't understand the goal of the Class level annotations in EJB3 too.

Thank you for your help !
 
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