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

Author: Serge Pagop
Level: Intermediate
Technologies: SFSB EJB
Summary: The shopping-cart quickstart demonstrates how to deploy and run a simple Java EE 7 shopping cart application that uses a stateful session bean (SFSB).
Target Product: JBoss EAP
Source: https://github.com/jbossas/eap-quickstarts/

What is it?

The shopping-cart quickstart demonstrates how to deploy and run a simple Java EE 7 application that uses a stateful session bean (SFSB) in Red Hat JBoss Enterprise Application Platform. The application 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

The application this project produces is designed to be run on Red Hat JBoss Enterprise Application Platform 7.1 or later.

All you need to build this project is Java 8.0 (Java SDK 1.8) or later and Maven 3.3.1 or later. See Configure Maven for JBoss EAP 7.1 to make sure you are configured correctly for testing the quickstarts.

Use of EAP7_HOME

In the following instructions, replace EAP7_HOME with the actual path to your JBoss EAP installation. The installation path is described in detail here: Use of EAP7_HOME and JBOSS_HOME Variables.

Configure the Server

This example quickstart purposely throws a NoSuchEJBException exception when the shopping cart is empty. This is the expected result because method is annotated with @Remove. This means the next invocation after the shopping cart checkout fails because the container has destroyed the instance and it is no longer available. If you do not run this script, you see the following ERROR in the server log, followed by the stacktrace

ERROR [org.jboss.as.ejb3.invocation] (EJB default - 7) WFLYEJB0034: EJB Invocation failed on component ShoppingCartBean for method public abstract java.util.Map org.jboss.as.quickstarts.sfsb.ShoppingCart.getCartContents(): javax.ejb.NoSuchEJBException: WFLYEJB0168: Could not find EJB with id UnknownSessionID [5168576665505352655054705267485457555457535250485552546568575254]

Follow the steps below to suppress system exception logging.

  1. Before you begin, back up your server configuration file

    • If it is running, stop the JBoss EAP server.
    • Backup the file: EAP7_HOME/standalone/configuration/standalone.xml
    • After you have completed testing this quickstart, you can replace this file to restore the server to its original configuration.

  2. Start the JBoss EAP server by typing the following:

     For Linux:  EAP7_HOME/bin/standalone.sh
 For Windows:  EAP7_HOME\bin\standalone.bat

  3. Review the configure-system-exception.cli file in the root of this quickstart directory. This script sets the log-system-exceptions attribute to false in the ejb3 subsystem in the server configuration file.

  4. Open a new command prompt, navigate to the root directory of this quickstart, and run the following command, replacing EAP7_HOME with the path to your server:

     For Linux: EAP7_HOME/bin/jboss-cli.sh --connect --file=configure-system-exception.cli
 For Windows: EAP7_HOME\bin\jboss-cli.bat --connect --file=configure-system-exception.cli

    You should see the following result when you run the script:

     The batch executed successfully

  5. Stop the JBoss EAP server.

Review the Modified Server Configuration

After stopping the server, open the EAP7_HOME/standalone/configuration/standalone.xml file and review the changes.

You should see the following configuration in the ejb3 subsystem.

  <log-system-exceptions value="false"/>

Start the Server

  1. Open a command prompt and navigate to the root of the JBoss EAP directory.

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

     For Linux:   EAP7_HOME/bin/standalone.sh
 For Windows: EAP7_HOME\bin\standalone.bat

Build and Deploy the Quickstart

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

  2. Open a command prompt 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:

     mvn clean install wildfly:deploy

  4. This Maven goal will deploy server/target/shopping-cart-server.jar. You can check the server console to see information messages regarding the deployment.

     INFO  [org.jboss.as.ejb3.deployment] (MSC service thread 1-2) WFLYEJB0473: JNDI bindings for session bean named 'ShoppingCartBean' in deployment unit 'deployment "shopping-cart-server.jar"' are as follows:

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

 INFO  [org.jboss.weld.deployer] (MSC service thread 1-4) WFLYWELD0006: Starting Services for CDI deployment: shopping-cart-server.jar
 INFO  [org.jboss.weld.deployer] (MSC service thread 1-8) WFLYWELD0009: Starting weld service for deployment shopping-cart-server.jar
 INFO  [org.jboss.as.server] (management-handler-thread - 3) WFLYSRV0010: Deployed "shopping-cart-server.jar" (runtime-name : "shopping-cart-server.jar")

Run the Client Application

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

You can use the command prompt from the previous step or open a new one and navigate to the root of the shopping-cart quickstart directory.

Type the following command:

    mvn exec:java -f client/pom.xml

Note: This quickstart requires quickstart-parent artifact to be installed in your local Maven repository. To install it, navigate to quickstarts project root directory and run the following command:

    mvn clean install

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 32 GB USB 2.0 Flash Drive and one Wireless Ergonomic Keyboard and Mouse.
  2. The client sends a remote method invocation to get the contents of the cart and prints it to the console.
  3. The client sends a remote method invocation to invoke checkout. Note the checkout() method in the server ShoppingCartBean has the @Remove annotation. This means the container will destroy shopping cart after the call and it will no longer be available.
  4. The client calls getCartContents() to make sure the shopping cart was removed after checkout. This results in a javax.ejb.NoSuchEJBException trace in the server, proving the cart was removed.

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

&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&
Obtained the remote interface to the shopping cart
Buying a "32 GB USB 2.0 Flash Drive".
Buying another "32 GB USB 2.0 Flash Drive".
Buying a "Wireless Ergonomic Keyboard and Mouse"

Print cart:
1     Wireless Ergonomic Keyboard and Mouse
2     32 GB USB 2.0 Flash Drive

Checkout
Cart was correctly removed, as expected, after Checkout
&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&

In the server log, you should see:

INFO  [stdout] (pool-9-thread-8) implementing checkout() left as exercise for the reader!

Restore the Server Configuration

You can restore the system exception configuration by running the restore-system-exception.cli script provided in the root directory of this quickstart or by manually restoring the back-up copy the configuration file.

Restore the Server Configuration by Running the JBoss CLI Script

  1. Start the JBoss EAP server by typing the following:

     For Linux:  EAP7_HOME/bin/standalone.sh
 For Windows:  EAP7_HOME\bin\standalone.bat

  2. Open a new command prompt, navigate to the root directory of this quickstart, and run the following command, replacing EAP7_HOME with the path to your server:

     For Linux: EAP7_HOME/bin/jboss-cli.sh --connect --file=restore-system-exception.cli
 For Windows: EAP7_HOME\bin\jboss-cli.bat --connect --file=restore-system-exception.cli

    This script restores the the log-system-exceptions attribute value to true. You should see the following result when you run the script:

     The batch executed successfully

Restore the Server Configuration Manually

  1. If it is running, stop the JBoss EAP server.
  2. Replace the EAP7_HOME/standalone/configuration/standalone.xml file with the back-up copy of the file.

Undeploy the Archive

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

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

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

     mvn wildfly:undeploy

Run the Quickstart in Red Hat JBoss Developer Studio or Eclipse

You can also start the server and deploy the quickstarts or run the Arquillian tests from Eclipse using JBoss tools. For general information about how to import a quickstart, add a JBoss EAP server, and build and deploy a quickstart, see Use JBoss Developer Studio or Eclipse to Run the Quickstarts.

This quickstart consists of multiple projects, so it deploys and runs differently in JBoss Developer Studio than the other quickstarts.

  • Be sure to configure JBoss EAP to suppress system exception logging as described above under Configure the Server. Stop the server at the end of that step.
  • To deploy the server project, right-click on the shopping-cart-server project and choose Run As --> Run on Server.
  • To run the client, right-click on the shopping-cart-client project and choose Run As --> Java Application. In the Select Java Application window, choose Client - org.jboss.as.quickstarts.client and click OK. The client output displays in the Console window.
  • Be sure to Restore the Server Configuration when you have completed testing this quickstart.

Debug the Application

If you want to debug the source code of any library in the project, run the following command to pull the source into your local repository. The IDE should then detect it.

    mvn dependency:sources