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| persistence-context ref |
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| <H1><A name="persistence-contextref-Viaannotation"></A>Via annotation</H1> |
| |
| <P>Both lookup and injection of an EntityManager can be configured via the @PersistenceContext annotation.</P> |
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| <TEXTAREA name="newcodemacro" class="java:nocontrols:nogutter" rows="10" readonly="readonly">package org.superbiz; |
| |
| import javax.persistence.PersistenceContext; |
| import javax.persistence.EntityManager; |
| import javax.ejb.Stateless; |
| import javax.naming.InitialContext; |
| |
| @Stateless |
| @PersistenceContext(name = "myFooEntityManager", unitName = "foo-unit") |
| public class MyBean implements MyInterface { |
| |
| @PersistenceContext(unitName = "bar-unit") |
| private EntityManager myBarEntityManager; |
| |
| public void someBusinessMethod() throws Exception { |
| if (myBarEntityManager == null) throw new NullPointerException("myBarEntityManager not injected"); |
| |
| // Both can be looked up from JNDI as well |
| InitialContext context = new InitialContext(); |
| EntityManager fooEntityManager = (EntityManager) context.lookup("java:comp/env/myFooEntityManager"); |
| EntityManager barEntityManager = (EntityManager) context.lookup("java:comp/env/org.superbiz.MyBean/myBarEntityManager"); |
| } |
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| |
| |
| <H1><A name="persistence-contextref-Viaxml"></A>Via xml</H1> |
| |
| <P>The above @PersistenceContext annotation usage is 100% equivalent to the following xml.</P> |
| |
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| <persistence-context-type>Transaction</persistence-context-type> |
| </persistence-context-ref> |
| <persistence-context-ref> |
| <persistence-context-ref-name>org.superbiz.calculator.MyBean/myBarEntityManager</persistence-context-ref-name> |
| <persistence-unit-name>bar-unit</persistence-unit-name> |
| <persistence-context-type>Transaction</persistence-context-type> |
| <injection-target> |
| <injection-target-class>org.superbiz.calculator.MyBean</injection-target-class> |
| <injection-target-name>myBarEntityManager</injection-target-name> |
| </injection-target> |
| </persistence-context-ref></TEXTAREA> |
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