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Overview

In this example we use the @Resource annotation to inject a javax.sql.DataSource into our bean. The trickiest thing about injecting a DataSource is not declaring the annotation, but actually configuring the data source.

In OpenEJB the rules are quite simple. An declaration like the following in code:

@Resource DataSource customerDataSource;

Matches a data source declared as follows in the openejb.xml file:

<Resource type="DataSource" id="customerDataSource">
 ....
</Resource>

As seen in this example, the data source can also be declared via properties as follows:

customerDataSource = new://Resource?type=DataSource

This style of properties creation can be used in the InitialContext properties, set into the System properties, or passed in on the command line as vm properties.

The source for this example is in the "injection-of-datasource" directory located in the openejb-examples.zip available on the download page.

The Code

Error formatting macro: snippet: java.lang.NullPointerException

Writing a unit test for the example

Error formatting macro: snippet: java.lang.NullPointerException

Running

Running the example is fairly simple. In the "injection-of-datasource" directory of the examples zip, just run:

$ mvn clean install

Which should create output like the following.

-------------------------------------------------------
 T E S T S
-------------------------------------------------------
Running org.superbiz.injection.MoviesTest
Apache OpenEJB 3.0    build: 20080408-04:13
http://openejb.apache.org/
INFO - openejb.home = /Users/dblevins/work/openejb-3.0/examples/injection-of-datasource
INFO - openejb.base = /Users/dblevins/work/openejb-3.0/examples/injection-of-datasource
INFO - Configuring Service(id=Default Security Service, type=SecurityService, provider-id=Default Security Service)
INFO - Configuring Service(id=Default Transaction Manager, type=TransactionManager, provider-id=Default Transaction Manager)
INFO - Configuring Service(id=movieDatabase, type=Resource, provider-id=Default JDBC Database)
INFO - Configuring Service(id=Default JDK 1.3 ProxyFactory, type=ProxyFactory, provider-id=Default JDK 1.3 ProxyFactory)
INFO - Found EjbModule in classpath: /Users/dblevins/work/openejb-3.0/examples/injection-of-datasource/target/classes
INFO - Configuring app: /Users/dblevins/work/openejb-3.0/examples/injection-of-datasource/target/classes
INFO - Configuring Service(id=Default Stateful Container, type=Container, provider-id=Default Stateful Container)
INFO - Auto-creating a container for bean Movies: Container(type=STATEFUL, id=Default Stateful Container)
INFO - Auto-linking resource-ref 'org.superbiz.injection.MoviesImpl/movieDatabase' in bean Movies to Resource(id=movieDatabase)
INFO - Loaded Module: /Users/dblevins/work/openejb-3.0/examples/injection-of-datasource/target/classes
INFO - Assembling app: /Users/dblevins/work/openejb-3.0/examples/injection-of-datasource/target/classes
INFO - Jndi(name=MoviesLocal) --> Ejb(deployment-id=Movies)
INFO - Created Ejb(deployment-id=Movies, ejb-name=Movies, container=Default Stateful Container)
INFO - Deployed Application(path=/Users/dblevins/work/openejb-3.0/examples/injection-of-datasource/target/classes)
Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.911 sec

Results :

Tests run: 1, Failures: 0, Errors: 0, Skipped: 0
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