Common Spring context for all EJBs

[Igor Dvorzhak]

I have four EJBs in my application which act as services

With help of Spring I am provide dependency injection of DAOs into the beans

But Weblogic initialized four Spring context: one per each EJB

Is there possibility to initialize one Spring context for all EJBs

P.S sorry for my English

ejb-jar.xml

  <?xml version="1.0" encoding="UTF-8"?>
<ejb-jar xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	version="3.0"
	xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
	http://java.sun.com/xml/ns/javaee/ejb-jar_3_0.xsd">
	<enterprise-beans>
		<session>
			<ejb-name>AuthorityServiceEjb</ejb-name>
			<home>com.webapp.ejb.home.AuthorityServiceEjbHome</home>
			<remote>com.webapp.ejb.remote.AuthorityServiceEjbRemote</remote>
			<ejb-class>com.webapp.ejb.service.AuthorityServiceEjb</ejb-class>
			<session-type>Stateless</session-type>
			<transaction-type>Container</transaction-type>

			<env-entry>
				<env-entry-name>ejb/BeanFactoryPath</env-entry-name>
				<env-entry-type>java.lang.String</env-entry-type>
				<env-entry-value>authority-dao-context.xml</env-entry-value>
			</env-entry>
		</session>

		<session>
			<ejb-name>ReservationServiceEjb</ejb-name>
			<home>com.webapp.ejb.home.ReservationServiceEjbHome</home>
			<remote>com.webapp.ejb.remote.ReservationServiceEjbRemote</remote>
			<ejb-class>com.webapp.ejb.service.ReservationServiceEjb</ejb-class>
			<session-type>Stateless</session-type>
			<transaction-type>Container</transaction-type>

			<env-entry>
				<env-entry-name>ejb/BeanFactoryPath</env-entry-name>
				<env-entry-type>java.lang.String</env-entry-type>
				<env-entry-value>reservation-dao-context.xml</env-entry-value>
			</env-entry>
		</session>

		<session>
			<ejb-name>RoomServiceEjb</ejb-name>
			<home>com.webapp.ejb.home.RoomServiceEjbHome</home>
			<remote>com.webapp.ejb.remote.RoomServiceEjbRemote</remote>
			<ejb-class>com.webapp.ejb.service.RoomServiceEjb</ejb-class>
			<session-type>Stateless</session-type>
			<transaction-type>Container</transaction-type>

			<env-entry>
				<env-entry-name>ejb/BeanFactoryPath</env-entry-name>
				<env-entry-type>java.lang.String</env-entry-type>
				<env-entry-value>room-dao-context.xml</env-entry-value>
			</env-entry>
		</session>

		<session>
			<ejb-name>UserServiceEjb</ejb-name>
			<home>com.webapp.ejb.home.UserServiceEjbHome</home>
			<remote>com.webapp.ejb.remote.UserServiceEjbRemote</remote>
			<ejb-class>com.webapp.ejb.service.UserServiceEjb</ejb-class>
			<session-type>Stateless</session-type>
			<transaction-type>Container</transaction-type>

			<env-entry>
				<env-entry-name>ejb/BeanFactoryPath</env-entry-name>
				<env-entry-type>java.lang.String</env-entry-type>
				<env-entry-value>user-dao-context.xml</env-entry-value>
			</env-entry>
		</session>
	</enterprise-beans>

	<assembly-descriptor>
		<container-transaction>
			<method>
				<ejb-name>RoomServiceEjb</ejb-name>
				<method-name>*</method-name>
			</method>

			<method>
				<ejb-name>ReservationServiceEjb</ejb-name>
				<method-name>*</method-name>
			</method>

			<method>
				<ejb-name>AuthorityServiceEjb</ejb-name>
				<method-name>*</method-name>
			</method>

			<method>
				<ejb-name>UserServiceEjb</ejb-name>
				<method-name>*</method-name>
			</method>
			<trans-attribute>Required</trans-attribute>
		</container-transaction>
	</assembly-descriptor>
</ejb-jar>  

  public class AuthorityServiceEjb extends AbstractStatelessSessionBean implements
		AuthorityService {

	private static final long serialVersionUID = 2136157208897980646L;

	private static final String DAO_BEAN_NAME = "authorityDao";

	private AuthorityDao authorityDao;
	
	/**
	 * @see org.springframework.ejb.support.AbstractStatelessSessionBean#onEjbCreate()
	 */
	@Override
	protected void onEjbCreate() throws CreateException {
		authorityDao = (AuthorityDao) getBeanFactory().getBean(DAO_BEAN_NAME);
	}

}
  

[Jeanne Boyarsky]

Igor,
Welcome to JavaRanch!

All of your EJBs point to a different Spring config xml file. How would they share the same Spring context if they are containing different sets of beans?

If you merge the xml files into one, at least it becomes logically possible to share a context. The Pro Spring article says the default is a different app context per ejb, but:

If this behavior is undesirable for your application, then Spring provides the SingletonBeanFactoryLocator and ContextSingletonBeanFactoryLocator classes that load singleton instances of BeanFactory and ApplicationContext, respectively. For more information, see the Javadoc for these classes

[Igor Dvorzhak]

Thanks, it really help me

To provide single context for all EJBs I use ContextSingletonBeanFactoryLocator instead of the default ContextJndiBeanFactoryLocator, as described in the Spring documentation