Each example has its own build.xml
file; this
allows each example to be run independently.
The build.xml
file for this example is
located in the examples/statelessbean
folder.
This example is a stateless session bean. It contains a
helloWorld()
method that displays text on the
server side. Additionally, it demonstrates the use of EJB3 annotation,
such as @Stateless.
The trace()
method is annotated with
@AroundInvoke EJB3 annotation. This method
will be called at each call on a business method. The business methods
are defined in the interface implemented by the SessionBean
class.
The signature of the method annotated by @AroundInvoke when it is defined in the bean class, must follow this signature:
(private|protected|public) Object methodName(InvocationContext invocationContext)
throws Exception;
![]() | Note |
---|---|
As a new feature of the EJB3, the bean's interface does not need to extend the Remote interface. |
If the server is not available, it must be run by following the steps described in Chapter 3, "Running the EasyBeans Server."
The stateless session bean must be deployed. If the bean has
been installed in the ejb3s
folder, this is done automatically.
On the server side, the following output should be seen:
[java] INFO: Creating container for archive /home/benoitf/workspace/easybeans/ejb3s/stateless.jar. [java] INFO: Analyze elapsed during : 95 ms [java] INFO: Binding bean XXX with interface XXX into registry with jndi name XXX [java] INFO: Enhancement elapsed during : 105 ms [java] INFO: Container started in : 274 ms
Once this information is displayed on the screen, the container is ready to receive client calls.
Once the container has been started, the client can be launched.
Run the client with the following ant command: ant run.client
If the client runs successfully, the following output is displayed:
[java] Calling helloWorld method... [java] Add 1 + 2... [java] Sum = '3'.
![]() | Note |
---|---|
In the client's code, the use of the PortableRemoteObject.narrow() call is no longer required. |
The build.xml
file for this example is
located in the examples/statefulbean
folder.
This is an example of a stateful session bean using the
SessionSynchronization
interface.
It uses the @Stateful annotation and uses the default transaction model, which is REQUIRED.
If the server is not available, it must be run by following the steps described in Chapter 3, "Running the EasyBeans Server."
The stateful session bean must be deployed. It is done
automatically if the bean has been installed in the ejb3s
folder.
On the server side, the following output should be seen:
[java] INFO: Creating container for archive /home/benoitf/workspace/easybeans/ejb3s/stateful.jar. [java] INFO: Analyze elapsed during : 89 ms [java] INFO: Enhancement elapsed during : 76 ms [java] INFO: Binding bean XXX with interface XXX into registry with jndi name XXX [java] INFO: Container started in : 251 ms
Once this information is displayed on the screen, the container is ready to receive client calls.
Once the container has been started, the client can be launched.
Run the client with the following ant command: ant run.client
If the client runs successfully, the following output is displayed:
[java] Start a first transaction [java] First request on the new bean [java] Second request on the bean [java] Commit the transaction [java] Start a second transaction [java] Buy 50 amount. [java] Rollback the transaction [java] after rollback, value = 30 [java] Request outside any transaction [java] Check that value = 30 [java] ClientStateful OK. Exiting.
The build.xml
file for this example is
located in the examples/entitybean
folder.
This is an example of an entity bean. It describes how to use the new Java Persistence Model of an EJB3 persistence provider. To access EJB3 entities that are POJO, a stateless session bean is used. It is a facade bean.
The Entity class is a POJO class annotated with @Entity. The entities class is managed by the persistence provider.
Currently, the persistence provider is supplied by the Hibernate product, but the ObjectWeb Speedo product should be available soon. Users will have the choice between providers.
This example uses the @Stateful annotation and uses the default transaction model, which is REQUIRED.
The example shows an entity bean using EJB3 Hibernate-prototype persistence provider.
If the server is not available, it must be run following the steps described in Chapter 3, "Running the EasyBeans Server."
The entity bean must be deployed. It is done automatically if
the bean has been installed in the ejb3s
folder.
On the server side, the following output should be seen:
[java] INFO: Creating container for archive /home/benoitf/workspace/easybeans/ejb3s/entitybean.jar. [java] INFO: Analyze elapsed during : 95 ms [java] INFO: Enhancement elapsed during : 102 ms [java] INFO: No persistence provider was set, set to value org.hibernate.ejb.HibernatePersistence. [java] INFO: Hibernate 3.1.1 [java] INFO: Using provided datasource [java] INFO: RDBMS: HSQL Database Engine, version: 1.8.0 [...] [java] INFO: Binding bean XXX with interface XXX into registry with jndi name XXX [java] INFO: Container started in : 2010 ms
Once this information is displayed on the screen, the container is ready to receive client calls.