Top "Ejb" questions

Detached Entity and Managed Entity

What a "detached entity" means? How is it possible to convert a managed entity to a detached entity during a …

java database jpa ejb entity

What is the point of a Facade in Java EE?

I'm not really understanding the point of a facade. public abstract class AbstractFacade<T> { private Class<T&…

java design-patterns jakarta-ee ejb facade

EJB 3.1 @EJB Injection into POJO

With the new EJB 3.1 spec is it possible to inject an EJB into a pojo? I know in EJB 3.0 the @…

java ejb java-ee-6 ejb-3.1

what is a abstract method on a interface in java

Possible Duplicate: Why would one declare a Java interface method as abstract? I found the following code in one of …

java interface ejb abstract

Why do we need separate Remote and Local interfaces for EJB 3.0 session beans

I was wondering why do we need separate Remote and Local intefaces for EJB 3.0 Session beans. I guess most of …

jakarta-ee ejb ejb-3.0

EJB Transactions in local method-calls

In the following setup, does method B run in a (new) transaction? An EJB, having two methods, method A and …

jakarta-ee transactions ejb

Error invoking timeout for timer - could not obtain lock within 5MINUTES at EJB 3 timerservice

I have an application running on jboss 6.1 that defines a lot of dinamyc timers at the startup (e.g doSomething …

jboss timer ejb ejb-3.0 jboss6.x

What does adding the @Stateful or @Stateless annotations actually do?

I'm just getting to grips with Java EE. I know that adding @Stateful or @Stateless annotations to a class will …

jakarta-ee ejb

Persistence.xml not correctly configured

I'm not able to get this persistence file correct... I do not find any more information in the book that …

java jdbc persistence ejb jta

Stateless Session Beans vs. Singleton Session Beans

The Java EE 6 Tutorial says: To improve performance, you might choose a stateless session bean if it has any of …

java singleton ejb-3.0 ejb stateless