• 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
  • Ron McLeod
  • Junilu Lacar
  • Liutauras Vilda
Sheriffs:
  • Paul Clapham
  • Jeanne Boyarsky
  • Henry Wong
Saloon Keepers:
  • Tim Moores
  • Tim Holloway
  • Stephan van Hulst
  • Piet Souris
  • Carey Brown
Bartenders:
  • Jesse Duncan
  • Frits Walraven
  • Mikalai Zaikin

is it legal?

 
Ranch Hand
Posts: 98
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
public int ebjCreate () throws javax.ejb.CreateException?
It's a question from HFEJB. I think it's legal as "int" can be type of Primary key.
 
Ranch Hand
Posts: 41
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
George

this is Illegal.

ejbCreate<METHOD>() returns null for CMP.

1. However, compiler should complain this. Can anybody verify this??

2. If 1. is not true then EJB container should never ever ever call this method.
 
Ranch Hand
Posts: 36
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
I believe primitives are not valid for primary-key classes.
 
George Fung
Ranch Hand
Posts: 98
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
I believe primitives are not valid for primary-key classes

If the type of field is integer in table, we should use class Interger as return type. Am i right?
 
Darien Cheung
Ranch Hand
Posts: 36
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
Yes, wrapper classes (Integer, Boolean etc) are RMI-IIOP. You can also define your own primary key class but it must be serializable (amoung other requirements like public fields, etc.)
 
Nishant Verma
Ranch Hand
Posts: 41
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator

Originally posted by Darien Cheung:
You can also define your own primary key class but it must be serializable



Implementing the interface Serializable should **NOT** be a necessary condition. Reference 10.8 EJB 2.0 specs.

However, let me know if anybody disagrees.
 
Darien Cheung
Ranch Hand
Posts: 36
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
Section 10.6.13 says the PK class must be legal RMI-IIOP which implies serializable. Also HFE book page 333 says PK class must be serializable and public.
 
Ranch Hand
Posts: 146
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
it is illegal.
1. Primary key class should be serializable classes. so no primitives allowed. yes we can use wrapper classes.
2. the signature of the method must specify the primary key class(both BMP and CMP)
3. the actual return statement must return null though for CMP and the exact pk for BMP.
(This is to support inheritance. like if your CMP bean class extends from a BMP bean class(the signature of the method has the pk class and the return statement returns the pk))
hope this helps
 
George Fung
Ranch Hand
Posts: 98
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
thanks a lot
 
pie. 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