EJB HowTo has been created by David Blevins (May 23, 2008).

Content:

EJB HowTo

All EJB 3.0 howtos come with JUnit unit tests that can be run in Eclipse, IntelliJ, NetBeans, Maven, Ant or any IDE or build system without special plugins using OpenEJB as an embedded EJB container. The easiest way to run the howtos in your IDE is to use maven (mvn eclipse:eclipse or mvn idea:idea) to generate project descriptors.

title description APIs used
Simple EJB3 @Stateless bean with local and remote business interfaces and unit test.
  • javax.ejb.Remote
  • javax.ejb.Local
  • javax.ejb.Stateless
Simple Stateful Simple EJB3 @Stateful bean with local and remote business interfaces and unit test.
  • javax.ejb.Remote
  • javax.ejb.Stateful
EJB 2.1 Compatibility Shows an EJB 3.0 Stateful bean with Business interfaces and EJB 2.1 interfaces (now called "component" interfaces) using the @LocalHome and @RemoteHome. Four interfaces in total.
  • javax.ejb.CreateException
  • javax.ejb.EJBHome
  • javax.ejb.EJBLocalHome
  • javax.ejb.EJBLocalObject
  • javax.ejb.EJBObject
  • javax.ejb.Init
  • javax.ejb.Local
  • javax.ejb.LocalHome
  • javax.ejb.Remote
  • javax.ejb.RemoteHome
  • javax.ejb.Remove
  • javax.ejb.Stateful
Injection of env-entry Shows how @Resource can be used to inject env-entry values declared in an ejb-jar.xml file
  • javax.annotation.Resource
  • javax.ejb.Local
  • javax.ejb.Remote
  • javax.ejb.Stateful
Injection of env-entry 2 Same as the above example but shows how to use a properties file to declare the injection values and demonstrates how to get injection of more types such as java.util.Date, java.lang.Class, java.net.URI and more. OpenEJB specific feature.
  • javax.annotation.Resource
  • javax.ejb.Stateless
Injection of other EJBs Shows use of @EJB in a Stateless to have another Stateless bean injected into it.
  • javax.ejb.EJB
  • javax.ejb.Local
  • javax.ejb.Remote
  • javax.ejb.Stateless
Injection of DataSource Shows use of @Resource to have a JDBC DataSource injected into a Stateful bean. The Stateful bean does basic INSERT, SELECT and DELETE SQL operations.
  • javax.annotation.PostConstruct
  • javax.annotation.Resource
  • javax.ejb.Stateful
  • javax.sql.DataSource
Injection of EntityManager Shows use of @Resource to have an EntityManager with an EXTENDED persistence context injected into a @Stateful bean. An EJB 3 @Entity bean is used with the EntityManager to create, persist and merge data to a database.
  • javax.ejb.Stateful
  • javax.persistence.Entity
  • javax.persistence.EntityManager
  • javax.persistence.PersistenceContext
  • javax.persistence.PersistenceContextType.EXTENDED
  • javax.persistence.Query
Testing Transactions Shows use of @Resource to have an EntityManager with an TRANSACTION persistence context injected into a @Stateful bean using the @TransactionAttribute annotation and a TestCase that runs test code in a JTA Transaction. An EJB 3 @Entity bean is used with the EntityManager to create, persist and merge data to a database.
  • javax.ejb.Stateful
  • javax.ejb.Stateless
  • javax.ejb.TransactionAttribute
  • javax.ejb.TransactionAttributeType.MANDATORY
  • javax.ejb.TransactionAttributeType.REQUIRES_NEW
  • javax.persistence.Entity
  • javax.persistence.EntityManager
  • javax.persistence.PersistenceContext
  • javax.persistence.PersistenceContextType.TRANSACTION
  • javax.persistence.Query
Testing Security Builds upon the Injection of EntityManager Example but adds the use of @RolesAllowed and @PermitAll in the @Stateful bean to restrict who can perform create, persist and remove operations on the EntityManager. Shows a TestCase using the @RunAs annotation to execute and test the bean code as various users.
  • javax.annotation.security.PermitAll
  • javax.annotation.security.RolesAllowed
  • javax.annotation.security.RunAs
  • javax.ejb.EJBAccessException
  • javax.ejb.Stateful
  • javax.ejb.Stateless
  • javax.ejb.TransactionAttribute
  • javax.ejb.TransactionAttributeType.SUPPORTS
  • javax.persistence.Entity
  • javax.persistence.EntityManager
  • javax.persistence.PersistenceContext
  • javax.persistence.PersistenceContextType.EXTENDED
  • javax.persistence.Query
Embedded and Remotable Demonstrates how to use an OpenEJB feature that allows people embedding OpenEJB into their applications to support remote clients in other VMs. This is not required for unit testing.
  • javax.ejb.Remote
  • javax.ejb.Stateful
Helloworld Weblogic Demonstrates OpenEJBs ability to understand and support the WebLogic deployment descriptors so people using that platform in production can still use OpenEJB in their IDE or build to unit test their EJB applications.
  • javax.ejb.CreateException
  • javax.ejb.EJBLocalHome
  • javax.ejb.EJBLocalObject
  • javax.ejb.LocalHome
  • javax.ejb.Stateless

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