EJB 3.0 Entity Beans

[murali kankanala]

Hi Friends,

I read some of the tutorials on EJB 3.0, all of the tutorials explains JPA always they never talk about Entity Beans.

1) That means in EJB 3.0 no more Entity Beans only JPA Entities and EntityManager ? Could you please explain me ?
2) EJB 3.0 expalins deployment descriptors not required, if that is true how and where should i configure pool of instances ?


thanks,
Murali

[Jeanne Boyarsky]

Murali,
1) Yes. JPA replaced entity beans in EJB 3.
2) Deployment descriptors are optional. You are allowed to specify everything using annotations. In practice, some things makes sense to put in an annotation like a remote interface name. Others make sense to stay in the deployment descriptor like a transaction timeout.

[Amol Nayak]

EJB 3.0 expalins deployment descriptors not required, if that is true how and where should i configure pool of instances ?

You dont specify pool settings in deployment descriptor, it is done in an application server vendor specific way.

[Jeanne Boyarsky]

Amol Nayak wrote:

EJB 3.0 expalins deployment descriptors not required, if that is true how and where should i configure pool of instances ?

You dont specify pool settings in deployment descriptor, it is done in an application server vendor specific way.

Some app servers put them in an "extensions" descriptor. You are correct that it isn't a good example though since it's non-standard. How about a JNDI reference as a better example?