THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
Overview
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<object width="400" height="250"><param name="movie" value="http://www.youtube.com/v/g3lIPlegDJk?fs=1&hl=en_US&rel=0"></param><param name="allowFullScreen" value="true"></param><param name="allowscriptaccess" value="always"></param><embed src="http://www.youtube.com/v/g3lIPlegDJk?fs=1&hl=en_US&rel=0" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="400" height="250"></embed></object>
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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:
{code}
@Resource DataSource customerDataSource;
{code}
Matches a data source declared as follows in the openejb.xml file:
{code}
<Resource type="DataSource" id="customerDataSource">
....
</Resource>
{code}
As seen in this example, the data source can also be declared via properties as follows:
{code}
customerDataSource = new://Resource?type=DataSource
{code}
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|OPENEJB:Download] available on the download page._
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{div:style=clear:both;}{div} h1. |
The Code
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Code {snippet:id=code|url=openejb3/examples/injection-of-datasource/src/main/java/org/superbiz/injection/MoviesImpl.java|lang=java} h1. |
Writing
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a
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unit
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test
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for
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the example
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example {snippet:id=code|url=openejb3/examples/injection-of-datasource/src/test/java/org/superbiz/injection/MoviesTest.java|lang=java} |
Note
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in
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the
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above
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test
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code
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the
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following
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lines:
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} p.put("movieDatabase", "new://Resource?type=DataSource"); p.put("movieDatabase.JdbcDriver", "org.hsqldb.jdbcDriver"); p.put("movieDatabase.JdbcUrl", "jdbc:hsqldb:mem:moviedb"); {code} |
As
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mentioned
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these
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actually
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create
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and
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configure
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the
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data
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source.
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When
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OpenEJB
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boots
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up,
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these
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properties
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will
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get
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read
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and
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executed
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allowing
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you
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to
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keep
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all
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the
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configuration
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required
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to
...
run
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your
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tests
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right
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in
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the
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test
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case
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itself.
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No
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need
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to
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keep
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dozens
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of
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openejb.xml
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config
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files
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in
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your
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projects
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or
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try
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and
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create
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one
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big
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configuration
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that
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might
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end
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up
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loading
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a
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lot
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of
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unneeded
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containers
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and
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resources.
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In
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your
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production
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system
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you
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can
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place
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the
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properties
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into
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the
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OPENEJB_HOME/conf/system.properties
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file
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or
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add
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them
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to
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your
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OPENEJB_HOME/conf/openejb.xml
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with
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a
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declaration
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like
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so:
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{code:xml} <Resource type="DataSource" id="movieDatabase"> JdbcDriver = org.hsqldb.jdbcDriver JdbcUrl = jdbc:hsqldb:mem:moviedb </Resource> {code} h1. Running Running the example is fairly simple. In the |
Running
Running the example is fairly simple. In the "injection-of-datasource"
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directory
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of
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the
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,
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just
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run:
$ mvn clean install
Which should create output like the following.
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{quote} $ mvn clean install {quote} Which should create output like the following. {noformat} ------------------------------------------------------- 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 {noformat} |