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shopping-cart: EJB 3.1 Stateful Session Bean (SFSB) Example

Author: Serge Pagop

What is it?

In this example, you will learn how to deploy and run a simple Java EE 6 application named shopping-cart that uses a stateful session bean. The shopping-cart allows customers to buy, checkout and view their cart contents.

The shopping-cart application consists of the following:

  1. A server side component:

    This standalone Java EE module is a JAR containing EJBs. It is responsible for managing the shopping cart.

  2. A Java client:

    This simple Java client is launched using a "main" method. The remote client looks up a reference to the server module's API, via JNDI. It then uses this API to perform the operations the customer requests.

System requirements

All you need to build this project is Java 6.0 (Java SDK 1.6) or better, Maven 3.0 or better.

The application this project produces is designed to be run on JBoss Enterprise Application Platform 6 or JBoss AS 7.

Configure Maven

If you have not yet done so, you must Configure Maven before testing the quickstarts.

Start JBoss Enterprise Application Platform 6 or JBoss AS 7 with the Web Profile

  1. Open a command line and navigate to the root of the JBoss server directory.

  2. The following shows the command line to start the server with the web profile:

     For Linux:   JBOSS_HOME/bin/standalone.sh
 For Windows: JBOSS_HOME\bin\standalone.bat

Build and Deploy the Quickstart

  1. Make sure you have started the JBoss server. See the instructions in the previous section.

  2. Open a command line and navigate to the shopping-cart quickstart directory

  3. To build both the server component and the remote client program, deploy the server module, change into the examples shopping-cart directory and type the following:

    For JBoss Enterprise Application Platform 6 (Maven user settings NOT configured):

     mvn clean install jboss-as:deploy -s PATH_TO_QUICKSTARTS/example-settings.xml

    For JBoss AS 7 or JBoss Enterprise Application Platform 6 (Maven user settings configured):

     mvn clean install jboss-as:deploy

  4. This maven goal will deploy server/target/jboss-as-shoppingcart-server.jar. You can check the Application Server console to see information messages regarding the deployment.

Run the Client Application

Now start a client that will access the beans you just deployed:

For JBoss Enterprise Application Platform 6 (Maven user settings NOT configured): 

    mvn exec:java -f client/pom.xml -s PATH_TO_QUICKSTARTS/example-settings.xml

For JBoss AS 7 or JBoss Enterprise Application Platform 6 (Maven user settings configured): 

    mvn exec:java -f client/pom.xml

Investigate the Console Output

You should see the following:

  1. The client sends a remote method invocation to the stateful session bean to buy two Memory sticks and one MacBook Air Laptop
  2. The client sends a remote method invocation to get the contents of the cart, and print it
  3. The client sends a remote method invocation to invoke checkout

Note that the checkout will remove the SFSB. The client then sends a final remote method invocation to get the cart contents. As the bean has been removed, a NoSuchEjbException is thrown.

On the client console, you should see output similar to:

Mar 23, 2012 12:59:40 PM org.jboss.ejb.client.EJBClient <clinit>
INFO: JBoss EJB Client version 1.0.5.Final
Mar 23, 2012 12:59:40 PM org.xnio.Xnio <clinit>
INFO: XNIO Version 3.0.3.GA
Mar 23, 2012 12:59:40 PM org.xnio.nio.NioXnio <clinit>
INFO: XNIO NIO Implementation Version 3.0.3.GA
Mar 23, 2012 12:59:40 PM org.jboss.remoting3.EndpointImpl <clinit>
INFO: JBoss Remoting version 3.2.3.GA
Mar 23, 2012 12:59:40 PM org.jboss.ejb.client.remoting.VersionReceiver handleMessage
INFO: Received server version 1 and marshalling strategies [river]
Mar 23, 2012 12:59:40 PM org.jboss.ejb.client.remoting.RemotingConnectionEJBReceiver associate
INFO: Successful version handshake completed for receiver context EJBReceiverContext{clientContext=org.jboss.ejb.client.EJBClientContext@2ad1918a, receiver=Remoting connection EJB receiver [connection=Remoting connection <6b28215d>,channel=jboss.ejb,nodename=ptarmigan]} on channel Channel ID a2f59bb1 (outbound) of Remoting connection 5caccd65 to localhost/127.0.0.1:4447
Mar 23, 2012 12:59:40 PM org.jboss.ejb.client.remoting.ChannelAssociation$ResponseReceiver handleMessage
WARN: Unsupported message received with header 0xffffffff

&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&
Obtained the remote interface to the shopping cart
Buying a "JBoss Enterprise Application Platform 6"
Buying another "JBoss Enterprise Application Platform 6"
Buying a "JBoss SOA Platform 6"

Print cart:
1     JBoss SOA Platform 6
2     JBoss Enterprise Application Platform 6

Checkout
Mar 23, 2012 12:59:41 PM org.jboss.ejb.client.remoting.ChannelAssociation resultReady
INFO: Discarding result for invocation id 6 since no waiting context found
ERROR: Cannot access cart after Checkout!
&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&

On the server console, you should see output similar to:

18:22:06,896 INFO  [org.jboss.as.ejb3.deployment.processors.EjbJndiBindingsDeploymentUnitProcessor] (MSC service thread 1-2) JNDI bindings for session bean named ShoppingCartBean in deployment unit deployment "jboss-as-shoppingcart-server.jar" are as follows:

	java:global/jboss-as-shoppingcart-server/ShoppingCartBean!org.jboss.as.quickstarts.sfsb.ShoppingCart
	java:app/jboss-as-shoppingcart-server/ShoppingCartBean!org.jboss.as.quickstarts.sfsb.ShoppingCart
	java:module/ShoppingCartBean!org.jboss.as.quickstarts.sfsb.ShoppingCart
	java:global/jboss-as-shoppingcart-server/ShoppingCartBean
	java:app/jboss-as-shoppingcart-server/ShoppingCartBean
	java:module/ShoppingCartBean

18:22:07,865 INFO  [org.jboss.as.server] (management-handler-threads - 2) JBAS018559: Deployed "jboss-as-shoppingcart-server.jar"
18:29:53,757 INFO  [stdout] (pool-9-thread-8) implementing checkout() left as exercise for the reader!
18:29:53,794 INFO  [org.jboss.as.ejb3] (pool-9-thread-8) JBAS014101: Failed to find {[-22, 53, -53, 71, 41, 47, 72, -112, -113, -93, -43, -23, -2, -49, 119, 40]} in cache
18:29:53,798 ERROR [org.jboss.ejb3.invocation] (pool-9-thread-9) JBAS014134: EJB Invocation failed on component ShoppingCartBean for method public abstract java.util.HashMap org.jboss.as.quickstarts.sfsb.ShoppingCart.getCartContents(): javax.ejb.NoSuchEJBException: Could not find SFSB ShoppingCartBean

Undeploy the Archive

  1. Make sure you have started the JBoss Server as described above.

  2. Open a command line and navigate to the root directory of this quickstart.

  3. When you are finished testing, type this command to undeploy the archive:

     mvn jboss-as:undeploy

Run the Quickstart in JBoss Developer Studio or Eclipse

You can also start the server and deploy the quickstarts from Eclipse using JBoss tools. For more information, see Use JBoss Developer Studio or Eclipse to Run the Quickstarts

Debug the Application

If you want to debug the source code or look at the Javadocs of any library in the project, run either of the following commands to pull them into your local repository. The IDE should then detect them.

    mvn dependency:sources
    mvn dependency:resolve -Dclassifier=javadoc