} }
Files Prepare Run Troubleshooting Related Topics
This example is a package that demonstrates an Enterprise Java Bean written to the EJB 2.0 specification. The example is an entity EJB called AccountBean.
The example demonstrates:
The client application performs these steps:
Directory Location:
MW_HOME/wlserver_10.3/samples/server/examples/src/examples/ejb/ejb20/basic/containerManaged/
(where MW_HOME is the directory containing your Oracle WebLogic Server installation)
|
File Click source files to view code. |
Description |
|---|---|
| AccountBean.java | AccountBean is an Entity Bean. This EJB illustrates:
|
| application.xml | Java EE standard enterprise application deployment descriptor. |
| build.xml | Ant build file that contains targets for building and running the example. |
| Client.java | Class that demonstrates calling an entity EJB, followed by two exercises:
|
| ProcessingErrorException.java | Class that is thrown if the caller attempts to withdraw more than a certain preset limit from the account. |
| table.ddl | File that sets up tables and constraints in database. |
| weblogic-application.xml | Oracle WebLogic Server-specific enterprise application deployment descriptor. |
Before working with this example:
This example is preconfigured to work with the PointBase database, included with the Oracle WebLogic Server distribution. As you'll use a database for the persistent storage of the entity EJB, you'll need to set it up. The PointBase database is started automatically in the background when you start the Examples server, but you should confirm that it is running and configure it to your specifications using the PointBase console; see Opening the PointBase Console for instructions. The persistent storage is completely invisible to the client; the actual storage is handled by the EJB directly and not the container.
With database persistence, each instance of an EJB is written to a row in a table. If you want or need to run this example with Oracle, see Oracle WebLogic Server Examples Database Guide for instructions.
No special configuration is required for this example because the examples-dataSource-demoXAPool
datasource is preconfigured. To verify that this datasource is configured and deployed, you may follow the steps below:
The commands above build the example and place the files in the following locations in your Oracle WebLogic Server distribution:
Additional information on using the build scripts is found in More About Building Examples.
The following output is displayed:
Beginning containerManaged.Client... Starting Part A of the example... Creating account 10020 with a balance of 3000.0 account type Savings... Account 10020 successfully created Part A: Depositing $2000 Current balance is $5000.0 Attempting to withdraw an amount greater than current balance. Expecting an exception... Received expected Processing Error: examples.ejb11.basic.containerManaged.ProcessingErrorException: Request to withdraw $5001.0; is more than balance $5000.0 in account 10020 Removing account... End Part A of the example... Starting Part B of the example... Creating account ID: 0 with a balance of 0.0 account type null... Account ID: 0 successfully created Creating account ID: 1 with a balance of 1000.0 account type Savings... Account ID: 1 successfully created Creating account ID: 2 with a balance of 2000.0 account type Savings... Account ID: 2 successfully created Creating account ID: 3 with a balance of 3000.0 account type Savings... Account ID: 3 successfully created Creating account ID: 4 with a balance of 4000.0 account type Savings... Account ID: 4 successfully created Creating account ID: 5 with a balance of 5000.0 account type null... Account ID: 5 successfully created Creating account ID: 6 with a balance of 6000.0 account type Savings... Account ID: 6 successfully created Creating account ID: 7 with a balance of 7000.0 account type Savings... Account ID: 7 successfully created Creating account ID: 8 with a balance of 8000.0 account type Savings... Account ID: 8 successfully created Creating account ID: 9 with a balance of 9000.0 account type Savings... Account ID: 9 successfully created Creating account ID: 10 with a balance of 10000.0 account type null... Account ID: 10 successfully created Creating account ID: 11 with a balance of 11000.0 account type Savings... Account ID: 11 successfully created Creating account ID: 12 with a balance of 12000.0 account type Savings... Account ID: 12 successfully created Creating account ID: 13 with a balance of 13000.0 account type Savings... Account ID: 13 successfully created Creating account ID: 14 with a balance of 14000.0 account type Savings... Account ID: 14 successfully created Creating account ID: 15 with a balance of 15000.0 account type null... Account ID: 15 successfully created Creating account ID: 16 with a balance of 16000.0 account type Savings... Account ID: 16 successfully created Creating account ID: 17 with a balance of 17000.0 account type Savings... Account ID: 17 successfully created Creating account ID: 18 with a balance of 18000.0 account type Savings... Account ID: 18 successfully created Creating account ID: 19 with a balance of 19000.0 account type Savings... Account ID: 19 successfully created 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 Querying for an account with zero balance... Account ID: 0; balance is zero Querying for accounts with a null account type Account ID: 0; account type is null Account ID: 5; account type is null Account ID: 10; account type is null Account ID: 15; account type is null Removing beans... End Part B of the example... End containerManaged.Client...
This does not allow you to see the ACCOUNTS database table filled with values because it executes quickly and removes entries when it is finished. If it did not, a simple SQL query, such as SELECT * FROM ACCOUNTS, could display the contents of the table.
(Internet connection required.)