content/custom-injection.cwiki

h1. Overview

As noted in the [Injection of env-entry Example], the EJB 3.0 supported env-entry types are fairly limited.  Also the use of several <env-entry> tags in an ejb-jar.xml can get a bit verbose.

OpenEJB does not restrict you to just these data types or require you to use an ejb-jar.xml to declare them.

 - *@Resource* can be used on any type for which there is *java.beans.PropertyEditor*
 - You may *install your own* PropertyEditors and package them with your app.
 - Java *Generics* are supported (e.g. List<URI> myURIs) 
 - You may use a *META-INF/env-entries.properties* file as an alternative to an ejb-jar.xml

See [Built-in Type Converters] for a full list of supported env-entry types.

_The source for this example is the "custom-injection" directory located in the [openejb-examples.zip|OPENEJB:Download] available on the download page._

h1. The Code

h2. Bean Class

{snippet:id=code|url=openejb3/examples/custom-injection/src/main/java/org/superbiz/enventries/StratocasterImpl.java|lang=java}

h2. The META-INF/env-entries.properties file

{snippet:id=code|url=openejb3/examples/custom-injection/src/main/resources/META-INF/env-entries.properties|id=props|lang=none}

h2. The Custom Type and Editor

Support for java.lang.Enum types is already built-in, but we've decided we'd like to allow abbreviated versions of the enum constants to be usable.  We do this by creating a custom PropertyEditor for our Pickup enum like so:

{snippet:id=code|url=openejb3/examples/custom-injection/src/main/java/org/superbiz/enventries/PickupEditor.java|lang=java}

We cleverly install this PropertyEditor in a static block in the Pickup class that will be executed should someone actually reference the Pickup type.

{snippet:id=code|url=openejb3/examples/custom-injection/src/main/java/org/superbiz/enventries/Pickup.java|lang=java}

h1. Test Case

{snippet:id=code|url=openejb3/examples/custom-injection/src/test/java/org/superbiz/enventries/StratocasterTest.java|lang=java}

h1. Running it

Running the example is fairly simple.  In the "custom-injection" directory of the [examples zip|OPENEJB:Download], just run:

{quote}
$ mvn clean install
{quote}

Which should create output like the following.

{noformat}
-------------------------------------------------------
 T E S T S
-------------------------------------------------------
Running org.superbiz.enventries.StratocasterTest
Apache OpenEJB 3.1-SNAPSHOT    build: 20080409-12:05
http://openejb.apache.org/
INFO - openejb.home = /Users/dblevins/work/openejb3/examples/custom-injection
INFO - openejb.base = /Users/dblevins/work/openejb3/examples/custom-injection
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=Default JDK 1.3 ProxyFactory, type=ProxyFactory, provider-id=Default JDK 1.3 ProxyFactory)
INFO - Found EjbModule in classpath: /Users/dblevins/work/openejb3/examples/custom-injection/target/classes
INFO - Configuring app: /Users/dblevins/work/openejb3/examples/custom-injection/target/classes
INFO - Configuring Service(id=Default Stateless Container, type=Container, provider-id=Default Stateless Container)
INFO - Auto-creating a container for bean StratocasterImpl: Container(type=STATELESS, id=Default Stateless Container)
INFO - Loaded Module: /Users/dblevins/work/openejb3/examples/custom-injection/target/classes
INFO - Assembling app: /Users/dblevins/work/openejb3/examples/custom-injection/target/classes
INFO - Jndi(name=StratocasterImplLocal) --> Ejb(deployment-id=StratocasterImpl)
INFO - Created Ejb(deployment-id=StratocasterImpl, ejb-name=StratocasterImpl, container=Default Stateless Container)
INFO - Deployed Application(path=/Users/dblevins/work/openejb3/examples/custom-injection/target/classes)
Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.705 sec

Results :

Tests run: 1, Failures: 0, Errors: 0, Skipped: 0
{noformat}