Win a copy of Programmer's Guide to Java SE 8 Oracle Certified Associate (OCA) this week in the OCAJP forum!
  • Post Reply
  • Bookmark Topic Watch Topic
  • New Topic

EJB for OCPJWSD 6.0.

 
ketan gote
Greenhorn
Posts: 2
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Hi


I am planning to give OCPJWSD 6.0. I have worked on web-service but have not much exposure to EJB, do i need to study first EJB.
If i don't know EJB should i try for OCPJWSD 5.0.
 
Sujeeth Pakala
Ranch Hand
Posts: 104
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
You should know how different types of EJBs (Stateless and Singleton) are exposed as SOAP / RESTful web services.
 
Himai Minh
Ranch Hand
Posts: 1309
6
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Sujeeth,
In Java Up and Running book, it introduced @Entity. And MZ's note mentions very little about @Singleton.
All I can do is to google @Entity and @Singleton to learn about them.
 
Sujeeth Pakala
Ranch Hand
Posts: 104
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
In Java Up and Running book, it introduced @Entity.


Plese tell me which chapter it is mentioned ?

Normally @Entity annotation used in persistence application and they hold the data present in table. It is unsual to expose these objects as web services. Or am I wrong ?
 
Himai Minh
Ranch Hand
Posts: 1309
6
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Sujeeth,
I am reading Chapter 6 of Java Web Service Up and Running. It has an example called FibNum.java. There is an @Entity annotation of this class.
This section teaches us how to deploy the FibNum in an ear file with persistency.xml in GlassFish.
I am still struggling with this example because I ran into oralce.toplink.essentials.database.DerbyPlatform is not found on GlassFish.
 
Frits Walraven
Creator of Enthuware JWS+ V6
Saloon Keeper
Pie
Posts: 2415
95
Android Chrome Eclipse IDE
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Hi All,

Let me get back to the original question
I am planning to give OCPJWSD 6.0. I have worked on web-service but have not much exposure to EJB, do i need to study first EJB.

No, you don't need to, but it will certainly help! A couple of topics from the EJB exam where also covered in the Web services exam. One of the things you learn from there is that you can only expose a Stateless Session Bean or Singleton Session Bean as a web service.

Forget about the @Entity though: this is not needed for the Web services exam (just in the book to make a nice example)

Regards,
Frits
 
  • Post Reply
  • Bookmark Topic Watch Topic
  • New Topic