What are the EJB annotations?

Annotations were introduced in Java 5.0. The purpose of having annotations is to attach additional information in the class or a meta-data of a class within its source code. In EJB 3.0, annotations are used to describe configuration meta-data in EJB classes.

Which of the following are applicable annotations to a session bean ejb3?

In your session bean, use the following metadata annotations inject entity information into a variable:

  • persistence. PersistenceContext —Injects a persistence context into a variable of data type javax.
  • persistence. PersistenceContext s—Specifies a set of multiple persistence contexts.
  • persistence.
  • persistence.

Does EJB 3.0 support dependency injection?

EJB 3.0 specification provides annotations, which can be applied on fields or setter methods to inject dependencies. EJB Container uses the global JNDI registry to locate the dependency.

Which annotation is required for remote view EJB?

@Local annotation
Your EJB must now define all its business interfaces using @Local annotation so it’s additional work for you. Not only you implement an interface but you need to remember to declare that your EJB is exposing it.

What is @local annotation in EJB?

javax.ejb The Local annotation is applied to the session bean class or local business interface to designate a local interface of the bean. When used on the bean class, declares the local business interface(s) for a session bean. When used on an interface, designates that interface as a local business interface.

Which annotation is used to inject an EJB into another EJB?

Like resource injection, you can inject Session bean references into another EJB or other managed class using annotations or deployment XML. If you prefer annotations you can use @javax. ejb. EJB annotations to inject either remote or local EJB references.

Which annotation is used to inject an datasource into an EJB?

You can use the @EJB annotation to inject EJB references and @Resource to access datasources.

What is local interface in EJB?

The local interface is a standard Java interface. It does not inherit from RMI. An enterprise bean uses the local interface to expose its methods to other beans that reside within the same container.

Why EJB is used in Java?

EJB beans are specifically designed to implement the business logic of your application. As such they provide services that are often needed when implementing such logic, such as transactions, injecting of the entity manager (used for JPA, the Java Persistence API) and pooling of beans.