How do I select a data source for my webapp?

Wel, I'm obviously not looking in the right manual because this ought to be like falling off a log!
I have developed a web application in JDeveloper 10.1.3 and I'm deploying it (using a WAR file) to an OC4J container in OAS 10.1.3.
I have created a JDBC data source (JNDI location jdbc/bmra89) to connect to a 9.2.0.7 Oracle database and testing this through the interface is successful. The data source is associated with a new Connection Pool.
I ensure that a default data-sources.xml file is NOT bundled into my WAR file from JDeveloper (because the database I want to connect to from the OAS is different to the database I want to connect to from the deployed web app) so it should be looking for one it builds itself. In fact, data-sources.xml exists in the j2ee/<webapp_name>/config directory that contains the details of the data source and connection pool I created.
During deployment of the generated WAR file, I have chosen to Edit the Deployment Plan and in here I have entered the name of the data source (jdbc/bmra89) into the box labelled "defaultDataSource" and the boxes labelled "connectorsPath" and "dataSourcesPath" I've left empty.
It all deploys OK, but when I try to access a page I get the following error:
500 Internal Server Error
JBO-30003: The application pool (model.AppModuleLocal) failed to checkout an application module due to the following exception:
oracle.jbo.JboException: JBO-29000: Unexpected exception caught: oracle.jbo.JboException, msg=JBO-29000: Unexpected exception caught: oracle.jbo.JboException, msg=JBO-29000: Unexpected exception caught: oracle.jbo.DMLException, msg=JBO-26061: Error while opening JDBC connection.
at oracle.jbo.common.ampool.ApplicationPoolImpl.doCheckout(ApplicationPoolImpl.java:1954)
So, any ideas where I'm going wrong? (I have to admit to being pretty lost with all this!)
Thanks,
Andy

Let's try to do this as easy as I'm capable of explaining.
Deploy the EAR to the Application server/OC4J standalone that you're trying to configure without modifying or removing any of the files in the EAR or WAR file and using all of the defaults.
Now start up the Application server control in you choice of web browser, my URL is http://localhost:8888/em.
After logging into the console select the "Adminstration" Link, and there will be List of Administration Tasks, one of which being the JDBC Resources under, Services.
After selecting the JDBC Resources "Go to Task" you will see 2 areas, Data Sources and Connection Pools. Somewhere in all of this you should see the jdev-connection-pool-bmra89, jdev-connection-managed-bmra89, and jdev-connection-native-bmra89.
I normally modify the jdev-connection-pool-xxxxx first to use the correct URL connection. IE- jdbc:oracle:thin:@localhost:1521:bmra89 to jdbc:oracle:thin:@138.51.128.100:1521:bmra89, changing localhost to a specific database IP address.
Then I'll click the Apply, and then go back and do the same to the jdev-connection-native-bmra89.
At this point you should be able to test the connections successfully, and get the Web Service to connect.
I hope I've covered it and that this helps, and you're not being thick. The data sources part of this stuff can be confusing.
Darren

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