What's New in EJB 3.0 - EJB 3.0 Database Persistence with Oracle Fusion Middleware 11g - page 5

For accessing multiple resources, use the corresponding grouping annotations
@javax.ejb.EJBs and @javax.annotation.Resources . An example of injecting
dependency on an EJB into a bean's variable using the @javax.ejb.EJB annotation is
as follows:
import javax.ejb.EJB;
@Stateful
public class CatalogBean implements Catalog {
@EJB(beanName = "HelloBean")
private Hello hello;
public void helloFromCatalogBean() {
hello.hello();
}
}
In the preceding example, the hello variable is injected with the EJB HelloBean . The
type of the hello variable is Hello , which is the HelloBean is business interface that
it implements. Subsequently, we invoked the hello() method of the HelloBean .
A resource may also be injected into a setter method. If the resource type can be
determined from the parameter type, the resource type is not required to be specified
in the @Resource annotation. In the following code snippet, the setter method is
annotated with the @Resource annotation. In the setter method, the dataSource
property is set to a JNDI resource of type javax.sql.DataSource with value as
catalogDB .
private javax.sql.DataSource dataSource;
@Resource(name="catalogDB")
public void setDataSource (DataSource jndiResource) {
this.dataSource = jndiResource;
}
The setter method must follow the JavaBean conventions: the method name begins
with set , returns void, and has only one parameter. If the name of the resource is
the same as the property name, the resource name is not required to be specified in
the @Resource annotation. The JNDI name of the resource is of the format
class_name/catalogDB , class_name being the class name.
private javax.sql.DataSource catalogDB;
@Resource
public void setCatalogDB (DataSource jndiResource) {
this.catalogDB = jndiResource;
}