Win a copy of Head First Android this week in the Android forum!
  • Post Reply Bookmark Topic Watch Topic
  • New Topic
programming forums Java Mobile Certification Databases Caching Books Engineering Micro Controllers OS Languages Paradigms IDEs Build Tools Frameworks Application Servers Open Source This Site Careers Other Pie Elite all forums
this forum made possible by our volunteer staff, including ...
Marshals:
  • Tim Cooke
  • Campbell Ritchie
  • Paul Clapham
  • Ron McLeod
  • Liutauras Vilda
Sheriffs:
  • Jeanne Boyarsky
  • Rob Spoor
  • Bear Bibeault
Saloon Keepers:
  • Jesse Silverman
  • Tim Moores
  • Stephan van Hulst
  • Tim Holloway
  • Carey Brown
Bartenders:
  • Piet Souris
  • Al Hobbs
  • salvin francis

Resource Injection.

 
Greenhorn
Posts: 4
Java ME Oracle Java
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
concider following entity manager factory injection.
<enterprise-beans>
<session>
<ejb-class>com.ex.A</ejb-class>
<ejb-name>BeanName</ejb-name>
<persistence-unit-ref>
<persistence-unit-ref-name>jndiname</persistence-unit-ref-name>
<injection-target>
<injection-target-class>com.ex.A</injection-target-class>
<injection-target-name>fieldName</injection-target-name>
</injection-target>
</persistence-unit-ref>

</session>
</enterprise-beans>
We have specified the <ejb-class> so why do we need to have a <injection-target-class> ?
 
Ranch Hand
Posts: 918
IntelliJ IDE Java Linux
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
Hi Sasinda

The ejb-class represents the bean corresponding class for the a given environment and the injection-* represents the injection applying point.
More precisely, the ejb-class is used to declare entries in the bean context, all the bean instances from this type may use this entries (via JNDI calls) - please notice the "may use it"; there is no must this is just a declaration.
The injection-target-class is used to specify the injection application point - it means inject this instance in this field.

Even if both elements (ejb-class and injection-target-class) have the same meaning they are used in different contexts.

If you dislike to see the "class" in two places you can remove the <ejb-class> element and use <remote> or <local> with the implemented interface.

Regards,
Mihai

 
sasinda Rukshan
Greenhorn
Posts: 4
Java ME Oracle Java
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
Thanks.
 
You showed up just in time for the waffles! And this tiny ad:
Building a Better World in your Backyard by Paul Wheaton and Shawn Klassen-Koop
https://coderanch.com/wiki/718759/books/Building-World-Backyard-Paul-Wheaton
reply
    Bookmark Topic Watch Topic
  • New Topic