Package examples.ejb20.basic.statelessSession

This example is a package that demonstrates anEnterprise JavaBean written to the EJB 2.0 specification.

See:
Description

Interface Summary

Trader	The methods in this interface are the public face of TraderBean.
TraderHome	This interface is the home interface for the TraderBean.java, which in WebLogic is implemented by the code-generated container class TraderBeanC.

Class Summary

Client	This class illustrates calling a stateless Session Bean and performing the following exercises: Create a Trader Buy some shares using the Trader Sell some shares using the Trader Remove the Trader
TraderBean	TraderBean is a stateless Session Bean.
TradeResult	This class reflects the results of a buy/sell transaction.

Package examples.ejb20.basic.statelessSession Description

This example is a package that demonstrates anEnterprise JavaBean written to the EJB 2.0 specification. The example is a stateless session EJBeancalled TraderBean.

The example demonstrates:

• Usage of a session EJBean written to the EJB 2.0 specification
• Stateless; client must maintain any state across calls to the EJBean
• Using application-defined exceptions and utilities
• Client Application

Pre-Built Examples

The EJB 2.0 examples included in the WebLogic Server 6.1 distribution are not shipped pre-built. To run these examples, you must build the example following the specific examples instructions.

Client Application

TheClientapplication performs these steps:

1. Creates a Trader
2. Buys and sells shares of "BEAS", "MSFT", "AMZN", and "HWP"
   (The EJB does not actually "buy" or "sell"; it simulates the actions of accessing a database.)
3. Removes the Trader

The application demonstrates how the client must maintain anypersistent state -- such as the change in the cash account -- acrossrepeated calls to the session EJBean. All the logic for the balance is encapsulatedin the Client, unlike thestateful session example,where all the persistence is provided by the container and thelogic is maintained in the EJBean.

To get the most out of this example, first read through the source code files to see what is happening.

• Client applications
  Client.java

  Interfaces

  Trader.java

  TraderHome.java

  TradeResult.java

  Deployment

  ejb-jar.xml

  weblogic-ejb-jar.xml

  Server (EJBean)

  TraderBean.java

Start with the XML deployment files ejb-jar.xml and weblogic-ejb-jar.xml to find the general structure of the EJBean, which classes are used for thedifferent objects and interfaces, then look atClient.java to see how the application works.

These three sections cover what to do:

1. Build the example
2. Configure the server
3. Run the example

Build the example

Set up your development shell as described in Setting up your environment.

We provide a build script for you to build the example:

The build script is build.xml.

Run the build script using the following Java ant command:
$ant

The script will build the example and place the files in thecorrect locations in your WebLogic Server distribution:

• Client files: in /config/examples/clientclasses
• EJBean: in /config/examples/applications/ejb20_basic_statelessSession.jar

Running the build script places the EJB in /config/examples/applications, where it automatically deploys once the server is started. If you are already running the server and build another EJB, it is automatically placed in this directory and instantly deployed.

Additional information on using the build scriptsis found in Building Enterprise JavaBean examples

Configure the server

1. Start the WebLogic Server.

2. Start the Administration Console.

3. Click to expand the Deployments node in the left pane and select EJB Deployments.

   A list of deployed EJBs displays.

4. Choose the appropriate deployment unit from the list.

5. Select the Target tab in the right-hand pane.

6. Verify that the EJB is deployed on the examplesServer.

Run the example

1. Run the client in a separate command line window. Set up your client as described in Setting up your environment,and then run the client by entering:

   $ java examples.ejb20.basic.statelessSession.Client "t3://WebLogicURL:Port"

   where:

   WebLogicURL

   Domain address of the WebLogic Server

   Port

   Port that is listening for connections(weblogic.system.ListenPort)

2. If you're running the Client example, you should get output similar to this from the client application:

   Beginning statelessSession.Client...Creating a traderBuying 100 shares of BEAS.Buying 200 shares of MSFT.Buying 300 shares of AMZN.Buying 400 shares of HWP.Selling 100 shares of BEAS.Selling 200 shares of MSFT.Selling 300 shares of AMZN.Selling 400 shares of HWP.Removing the traderEnd statelessSession.Client...

There's more...

Read more about EJB inBEAWebLogic Server Enterprise Java Beans.