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| <small><a href="./../../index.html">Home</a> » <a href="./../../examples-trunk/">Examples Trunk</a> » <a href="./../../examples-trunk/injection-of-ejbs/">Injection Of Ejbs</a></small><br> |
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| <h1>Injection Of Ejbs |
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| |
| <p>This example shows how to use the @EJB annotation on a bean class to refer to other beans.</p> |
| |
| <p>This functionality is often referred as dependency injection (see |
| http://www.martinfowler.com/articles/injection.html), and has been recently introduced in |
| Java EE 5.</p> |
| |
| <p>In this particular example, we will create two session stateless beans</p> |
| |
| <ul> |
| <li>a DataStore session bean</li> |
| <li>a DataReader session bean</li> |
| </ul> |
| |
| <p>The DataReader bean uses the DataStore to retrieve some informations, and |
| we will see how we can, inside the DataReader bean, get a reference to the |
| DataStore bean using the @EJB annotation, thus avoiding the use of the |
| JNDI API.</p> |
| |
| <h2>DataReader</h2> |
| |
| <pre><code>package org.superbiz.injection; |
| |
| import javax.ejb.EJB; |
| import javax.ejb.Stateless; |
| |
| /** |
| * This is an EJB 3.1 style pojo stateless session bean |
| * Every stateless session bean implementation must be annotated |
| * using the annotation @Stateless |
| * This EJB has 2 business interfaces: DataReaderRemote, a remote business |
| * interface, and DataReaderLocal, a local business interface |
| * <p/> |
| * The instance variables 'dataStoreRemote' is annotated with the @EJB annotation: |
| * this means that the application server, at runtime, will inject in this instance |
| * variable a reference to the EJB DataStoreRemote |
| * <p/> |
| * The instance variables 'dataStoreLocal' is annotated with the @EJB annotation: |
| * this means that the application server, at runtime, will inject in this instance |
| * variable a reference to the EJB DataStoreLocal |
| */ |
| //START SNIPPET: code |
| @Stateless |
| public class DataReader { |
| |
| @EJB |
| private DataStoreRemote dataStoreRemote; |
| @EJB |
| private DataStoreLocal dataStoreLocal; |
| @EJB |
| private DataStore dataStore; |
| |
| public String readDataFromLocalStore() { |
| return "LOCAL:" + dataStoreLocal.getData(); |
| } |
| |
| public String readDataFromLocalBeanStore() { |
| return "LOCALBEAN:" + dataStore.getData(); |
| } |
| |
| public String readDataFromRemoteStore() { |
| return "REMOTE:" + dataStoreRemote.getData(); |
| } |
| } |
| </code></pre> |
| |
| <h2>DataStore</h2> |
| |
| <pre><code>package org.superbiz.injection; |
| |
| import javax.ejb.LocalBean; |
| import javax.ejb.Stateless; |
| |
| /** |
| * This is an EJB 3 style pojo stateless session bean |
| * Every stateless session bean implementation must be annotated |
| * using the annotation @Stateless |
| * This EJB has 2 business interfaces: DataStoreRemote, a remote business |
| * interface, and DataStoreLocal, a local business interface |
| */ |
| //START SNIPPET: code |
| @Stateless |
| @LocalBean |
| public class DataStore implements DataStoreLocal, DataStoreRemote { |
| |
| public String getData() { |
| return "42"; |
| } |
| } |
| </code></pre> |
| |
| <h2>DataStoreLocal</h2> |
| |
| <pre><code>package org.superbiz.injection; |
| |
| import javax.ejb.Local; |
| |
| /** |
| * This is an EJB 3 local business interface |
| * A local business interface may be annotated with the @Local |
| * annotation, but it's optional. A business interface which is |
| * not annotated with @Local or @Remote is assumed to be Local |
| */ |
| //START SNIPPET: code |
| @Local |
| public interface DataStoreLocal { |
| |
| public String getData(); |
| } |
| </code></pre> |
| |
| <h2>DataStoreRemote</h2> |
| |
| <pre><code>package org.superbiz.injection; |
| |
| import javax.ejb.Remote; |
| |
| /** |
| * This is an EJB 3 remote business interface |
| * A remote business interface must be annotated with the @Remote |
| * annotation |
| */ |
| //START SNIPPET: code |
| @Remote |
| public interface DataStoreRemote { |
| |
| public String getData(); |
| } |
| </code></pre> |
| |
| <h2>EjbDependencyTest</h2> |
| |
| <pre><code>package org.superbiz.injection; |
| |
| import junit.framework.TestCase; |
| |
| import javax.ejb.embeddable.EJBContainer; |
| import javax.naming.Context; |
| |
| /** |
| * A test case for DataReaderImpl ejb, testing both the remote and local interface |
| */ |
| //START SNIPPET: code |
| public class EjbDependencyTest extends TestCase { |
| |
| public void test() throws Exception { |
| final Context context = EJBContainer.createEJBContainer().getContext(); |
| |
| DataReader dataReader = (DataReader) context.lookup("java:global/injection-of-ejbs/DataReader"); |
| |
| assertNotNull(dataReader); |
| |
| assertEquals("LOCAL:42", dataReader.readDataFromLocalStore()); |
| assertEquals("REMOTE:42", dataReader.readDataFromRemoteStore()); |
| assertEquals("LOCALBEAN:42", dataReader.readDataFromLocalBeanStore()); |
| } |
| } |
| </code></pre> |
| |
| <h1>Running</h1> |
| |
| <pre><code>------------------------------------------------------- |
| T E S T S |
| ------------------------------------------------------- |
| Running org.superbiz.injection.EjbDependencyTest |
| Apache OpenEJB 4.0.0-beta-1 build: 20111002-04:06 |
| http://tomee.apache.org/ |
| INFO - openejb.home = /Users/dblevins/examples/injection-of-ejbs |
| INFO - openejb.base = /Users/dblevins/examples/injection-of-ejbs |
| INFO - Using 'javax.ejb.embeddable.EJBContainer=true' |
| 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 - Found EjbModule in classpath: /Users/dblevins/examples/injection-of-ejbs/target/classes |
| INFO - Beginning load: /Users/dblevins/examples/injection-of-ejbs/target/classes |
| INFO - Configuring enterprise application: /Users/dblevins/examples/injection-of-ejbs |
| INFO - Configuring Service(id=Default Stateless Container, type=Container, provider-id=Default Stateless Container) |
| INFO - Auto-creating a container for bean DataReader: Container(type=STATELESS, id=Default Stateless Container) |
| INFO - Configuring Service(id=Default Managed Container, type=Container, provider-id=Default Managed Container) |
| INFO - Auto-creating a container for bean org.superbiz.injection.EjbDependencyTest: Container(type=MANAGED, id=Default Managed Container) |
| INFO - Enterprise application "/Users/dblevins/examples/injection-of-ejbs" loaded. |
| INFO - Assembling app: /Users/dblevins/examples/injection-of-ejbs |
| INFO - Jndi(name="java:global/injection-of-ejbs/DataReader!org.superbiz.injection.DataReader") |
| INFO - Jndi(name="java:global/injection-of-ejbs/DataReader") |
| INFO - Jndi(name="java:global/injection-of-ejbs/DataStore!org.superbiz.injection.DataStore") |
| INFO - Jndi(name="java:global/injection-of-ejbs/DataStore!org.superbiz.injection.DataStoreLocal") |
| INFO - Jndi(name="java:global/injection-of-ejbs/DataStore!org.superbiz.injection.DataStoreRemote") |
| INFO - Jndi(name="java:global/injection-of-ejbs/DataStore") |
| INFO - Jndi(name="java:global/EjbModule355598874/org.superbiz.injection.EjbDependencyTest!org.superbiz.injection.EjbDependencyTest") |
| INFO - Jndi(name="java:global/EjbModule355598874/org.superbiz.injection.EjbDependencyTest") |
| INFO - Created Ejb(deployment-id=DataReader, ejb-name=DataReader, container=Default Stateless Container) |
| INFO - Created Ejb(deployment-id=DataStore, ejb-name=DataStore, container=Default Stateless Container) |
| INFO - Created Ejb(deployment-id=org.superbiz.injection.EjbDependencyTest, ejb-name=org.superbiz.injection.EjbDependencyTest, container=Default Managed Container) |
| INFO - Started Ejb(deployment-id=DataReader, ejb-name=DataReader, container=Default Stateless Container) |
| INFO - Started Ejb(deployment-id=DataStore, ejb-name=DataStore, container=Default Stateless Container) |
| INFO - Started Ejb(deployment-id=org.superbiz.injection.EjbDependencyTest, ejb-name=org.superbiz.injection.EjbDependencyTest, container=Default Managed Container) |
| INFO - Deployed Application(path=/Users/dblevins/examples/injection-of-ejbs) |
| Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 1.225 sec |
| |
| Results : |
| |
| Tests run: 1, Failures: 0, Errors: 0, Skipped: 0 |
| </code></pre> |
| |
| |
| <div class="page-header"> </div> |
| <h4>APIs Used</h4> |
| <ul><li><a href="http://docs.oracle.com/javaee/6/api/javax/ejb/EJB.html">javax.ejb.EJB</a></li> |
| <li><a href="http://docs.oracle.com/javaee/6/api/javax/ejb/Local.html">javax.ejb.Local</a></li> |
| <li><a href="http://docs.oracle.com/javaee/6/api/javax/ejb/LocalBean.html">javax.ejb.LocalBean</a></li> |
| <li><a href="http://docs.oracle.com/javaee/6/api/javax/ejb/Remote.html">javax.ejb.Remote</a></li> |
| <li><a href="http://docs.oracle.com/javaee/6/api/javax/ejb/Stateless.html">javax.ejb.Stateless</a></li> |
| <li><a href="http://docs.oracle.com/javaee/6/api/javax/ejb/embeddable/EJBContainer.html">javax.ejb.embeddable.EJBContainer</a></li> |
| <li><a href="http://docs.oracle.com/javaee/6/api/javax/naming/Context.html">javax.naming.Context</a></li> |
| </ul> |
| |
| <h3>Source</h3> |
| <ul> |
| <li>Apache <a href="http://svn.apache.org/repos/asf/tomee/tomee/trunk/examples/injection-of-ejbs">injection-of-ejbs</a></li> |
| <li>Github <a href="https://github.com/apache/tomee/tree/trunk/examples/injection-of-ejbs">injection-of-ejbs</a></li> |
| </ul> |
| <pre> |
| svn co http://svn.apache.org/repos/asf/tomee/tomee/trunk/examples/injection-of-ejbs |
| cd injection-of-ejbs |
| mvn clean install |
| </pre> |
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