Develop a session bean to have a No-Interface Local view

We can specify that a session bean have a No-Interface view.

A session bean has a No-Interface Local view when:

• The bean does not expose any other client views (Local, Remote, 2.x Remote Home, 2.x Local Home, Web Service) and its implements clause is empty.

• The bean exposes at least one other client view. The bean designates that it exposes a no-interface view with the @LocalBean annotation on the bean class or in the deployment descriptor.

We can also declare metadata for a session bean with No-Interface Local view in the deployment descriptor rather than using annotations.

The following steps contain code snippets that demonstrate the code to use for a No-Interface view.

• Specify that a session bean have No-Interface view because there are no declared interfaces.

  @Stateless
  public class CartBean

• Specify that a session bean have No-Interface view using the @LocalBean annotation.

  @Stateless
  @LocalBean
  @Remote( Cart.class )
  public class CartBean implements Cart

• Specify metadata for a session bean with No-Interface Local view in the deployment descriptor.

  <?xml version="1.0"?>
  <ejb-jar
    xmlns="http://java.sun.com/xml/ns/javaee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/ejb-jar_3_1.xsd"
    version="3.1">
    <enterprise-beans>
      <session>
        <ejb-name>CartBean</ejb-name>
        <local-bean/>
        <business-remote>com.ibm.example.Cart</business-remote>
        <ejb-class>com.ibm.example.CartBean</ejb-class>
        <session-type>Stateless</session-type>
      </session>
    </enterprise-beans>
  </ejb-jar>

Subtopics

• No-Interface Local View
  New in EJB 3.1, session beans might now be exposed to clients through a No-Interface view. In prior versions of the specification, bean developers were required to provide an interface that would be used to expose the bean methods to a client.

• A session bean might now subclass another session bean
  New in EJB 3.1, a session bean might now subclass another session bean. Prior versions of the EJB specification restricted a session bean from inheriting from another session bean.

Related concepts

No-Interface Local View

A session bean might now subclass another session bean

Related tasks

Configure EJB 3.1 session bean methods to be asynchronous