Package examples.jconnector.simple

This example is a package that demonstrates the use of an entity Enterprise JavaBean to interact with a J2EE Connector resource adapter.

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.
Servlet	This servlet is a program similar to that in the Client example.

Exception Summary

ProcessingErrorException

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

Package examples.jconnector.simple Description

This example is a package that demonstrates the use of an entity Enterprise JavaBean to interact with a J2EE Connector resource adapter. The example is an entity EJBean called AccountBean. In this example, which uses the Black Box resource adapter from the Sun reference implementation, the resource adapter does not use the Common Client Interface (CCI). Instead, it uses JDBC to interact with a DBMS.

The example demonstrates:

• Interaction with a non-transactional resource adapter
• Usage of an entity EJBean
• Bean-managed persistence; the code in the EJBean directly accesses the data storage
• Using application-defined exceptions
• Client application
• Servlet

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

The Servlet runs in a similar fashion to the Client example. Call the servlet using an appropriate URL as described in the servlet directions. See Run the example for sample servlet output.

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

• Client applications
Client.java
Servlet.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 figure out the general structure of the EJBean and which classes are used for the different objects and interfaces. Then, look at Client code to see how the application works.

As you'll use a database for the persistent storage of the entity EJBean, you will 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.

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.

The build script is build.xml.

Run the build script as shown:
$ ant

This script builds the example and places the files in the correct locations in your WebLogic Server distribution:

• Client files: in %SAMPLES_HOME%/server/stage/examples/clientclasses/
• Servlet: in %SAMPLES_HOME%/server/stage/examples/examplesWebApp/WEB-INF/classes/
• EJBean: in /config/examples/applications/jconnector.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 script is 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.


This example contains a pre-configured servlet running in a browser called examplesWebApp.

7. Click the Web Applications node in the left-hand pane and select examplesWebApp.
8. In the right-hand pane, select the Target tab, and verify that the examplesWebApp is deployed on the examplesServer.
9. Click the Connectors node in the left-hand pane and select BlackBoxNoTx.
10. In the right-hand pane, select the Target tab, and verify that the BlackBoxNoTx 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.jconnector.simple.Client "t3://WebLogicURL:Port"

where:


WebLogicURL is the Domain address of the WebLogic Server

Port is the Port that is listening for connections.

To run the servlet, call the following URL from your browser:

http://localhost:7001/examplesWebApp/jconnector

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

Beginning jconnector.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 jconnector.Client...

3. If you are running the servlet example, you should get output similar to this:

Using user user1 and password user1Password


Looking up account 10020...
Did not find 10020
Account 10020 being created; opening balance is $3000.0


Part A: Depositing $100.0
Current balance is $3100.0


Withdrawing amount greater than current balance. Expecting an
exception...
Received expected Processing Error:
examples.jconnector.simple.ProcessingErrorException: Request to
withdraw $3110.0 more than balance 3100.0 in account 10020


Part B: Creating 5 new accounts...
Created account: 9543031558300; balance is $0.0
Created account: 9543031558301; balance is $100.0
Created account: 9543031558302; balance is $200.0
Created account: 9543031558303; balance is $300.0
Created account: 9543031558304; balance is $400.0


5 accounts successfully created


Querying for accounts with a balance greater than 200.0...
Account 10020; balance is $3100.0
Account 9543031558303; balance is $300.0
Account 9543031558304; balance is $400.0


Removing accounts just created...
Removed account: 9543031558300
Removed account: 9543031558301
Removed account: 9543031558302
Removed account: 9543031558303
Removed account: 9543031558304


End jconnector.Servlet...