Package examples.ejb11.basic.beanManaged

This example is a package that demonstrates an Enterprise JavaBean.

See:
Description

Interface Summary

Account	The methods in this interface are the public face of AccountBean.
AccountHome	This interface is the home interface for the EJBean AccountBean.

Class Summary

AccountBean	AccountBean is an EntityBean.
Client	This class demonstrates calling an entity EJBean.

Exception Summary

ProcessingErrorException

ProcessingErrorException is thrown if the caller attempts to withdraw more than a certain preset limit from the account.

Package examples.ejb11.basic.beanManaged Description

This example is a package that demonstrates an Enterprise JavaBean. The example is an entity EJBean called AccountBean.

The example demonstrates:

• Usage of an entity EJBean
• Bean-managed persistence; the code in the EJBean directly accesses the data storage
• Using application-defined exceptions
• Client application

Client application

The Client application performs these steps:

1. Finds or creates 20 separate accounts
2. Prints the balances for all accounts
3. Finds all accounts with a balance greater than $5000
4. Removes the accounts

To get the most out of this example, first read through the source code files.

• Client applications
  Client.java

  Interfaces

  Account.java

  AccountHome.java

  Deployment

  ejb-jar.xml

  weblogic-ejb-jar.xml

  Exception

  ProcessingErrorException.java

  Server (EJBean)

  AccountBean.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 the different objects and interfaces, then look at Client code to see how the application works.

Pre-Built Examples

This EJB 1.1 example is not shipped pre-built. Before you can run this example, you must first build it following the instructions in Build the example.

These four sections cover what to do:

1. Set Up the database
2. Build the example
3. Configure the server
4. Run the example

Set Up the database

This example is preconfigured to work with the PointBase database, included with the WebLogic Server distribution. As you'll use a database for the persistent storage of the entity EJBean, you'll need to set it up. Note that the persistent storage is completely invisible to the client; the actual storage is handled by the EJBean directly and not the container. With database persistence, each instance of an EJBean is written to a row in a table.

If you want or need to run this example with Oracle, see Database SetUp for instructions.

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:

prompt> ant

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

• Client.jar file: in SAMPLES_HOME\server\stage\examples\clientclasses
• EJB (in EAR file): in SAMPLES_HOME\server\config\examples\applications\ejb11_basic_beanManaged.ear

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

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

Configure the server

1. Start the WebLogic Server.

2. Start the Administration Console.

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

   A list of deployed EJBs displays in the left pane.

4. Choose the EJB that you want to deploy from the list of deployment units.

5. On the Edit EJB Descriptor page in the right pane, select the Targets tab.

   If you need more information about how to use connection pools, read Programming WebLogic JDBC.

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:

     prompt> ant run  

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

   Beginning beanManaged.Client...
   
   Trying to find account with id: ID: 0
   Trying to find account with id: ID: 1
   Trying to find account with id: ID: 2
   Trying to find account with id: ID: 3
   Trying to find account with id: ID: 4
   Trying to find account with id: ID: 5
   Trying to find account with id: ID: 6
   Trying to find account with id: ID: 7
   Trying to find account with id: ID: 8
   Trying to find account with id: ID: 9
   Trying to find account with id: ID: 10
   Trying to find account with id: ID: 11
   Trying to find account with id: ID: 12
   Trying to find account with id: ID: 13
   Trying to find account with id: ID: 14
   Trying to find account with id: ID: 15
   Trying to find account with id: ID: 16
   Trying to find account with id: ID: 17
   Trying to find account with id: ID: 18
   Trying to find account with id: ID: 19
   Account: :ID: 0 has a balance of 0.0
   Account: :ID: 1 has a balance of 1000.0
   Account: :ID: 2 has a balance of 2000.0
   Account: :ID: 3 has a balance of 3000.0
   Account: :ID: 4 has a balance of 4000.0
   Account: :ID: 5 has a balance of 5000.0
   Account: :ID: 6 has a balance of 6000.0
   Account: :ID: 7 has a balance of 7000.0
   Account: :ID: 8 has a balance of 8000.0
   Account: :ID: 9 has a balance of 9000.0
   Account: :ID: 10 has a balance of 10000.0
   Account: :ID: 11 has a balance of 11000.0
   Account: :ID: 12 has a balance of 12000.0
   Account: :ID: 13 has a balance of 13000.0
   Account: :ID: 14 has a balance of 14000.0
   Account: :ID: 15 has a balance of 15000.0
   Account: :ID: 16 has a balance of 16000.0
   Account: :ID: 17 has a balance of 17000.0
   Account: :ID: 18 has a balance of 18000.0
   Account: :ID: 19 has a balance of 19000.0
   
   Querying for accounts with a balance greater than 5000.0...
   Account ID: 6; balance is $6000.0
   Account ID: 7; balance is $7000.0
   Account ID: 8; balance is $8000.0
   Account ID: 9; balance is $9000.0
   Account ID: 10; balance is $10000.0
   Account ID: 11; balance is $11000.0
   Account ID: 12; balance is $12000.0
   Account ID: 13; balance is $13000.0
   Account ID: 14; balance is $14000.0
   Account ID: 15; balance is $15000.0
   Account ID: 16; balance is $16000.0
   Account ID: 17; balance is $17000.0
   Account ID: 18; balance is $18000.0
   Account ID: 19; balance is $19000.0
   Removing beans...
   
   End beanManaged.Client...
   

There's more...

Read more about EJB in BEA WebLogic Server Enterprise Java Beans.