JPA EntityManager lookup failure in Websphere7 environment

[Viji San]

Hi, I am trying to look up JPA EntityManager in DAO class in Websphere Application Server 7 environment and getting JNDI Name not found exception. I have configured to use Hibernate as JPA Persistence Provider.

My DAO class is below:

public class UserInfoDAO {
	
	private static String EM_NAME = "java:/comp/env/MySamplePersistence";
	private EntityManager em;
	
	public UserInfoDAO ()
	{
		
		Context context;
		try {
			context = new InitialContext();
			this.em = (EntityManager) context.lookup(EM_NAME);
		} catch (NamingException e) {
			e.printStackTrace();
		}
		
	}
	public UserInfo getUserInfo (String logonId)
	{
		return em.find(UserInfo.class, logonId);
	}
}

I tried with below provider properties information as well, but, the exception does not disappear

		Context context;
		try {
			String initialContextFactory = "com.ibm.websphere.naming.WsnInitialContextFactory";
			String providerUrl = "corbaloc:iiop:localhost:2809";
			
			Hashtable<String, String> environment = new Hashtable<String, String>();
			environment.put(Context.INITIAL_CONTEXT_FACTORY, initialContextFactory);
			environment.put(Context.PROVIDER_URL, providerUrl);
			
			context = new InitialContext(environment);
			this.em = (EntityManager) context.lookup(EM_NAME);
		} catch (NamingException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		

Trying to access DAO method in the below class.

public class UserManager {

	public UserInfo getUser (String username) {
		
		UserInfo user = new UserInfoDAO().getUserInfo(username));
		return user;
	}
	
}

Persistence.xml is below:

<?xml version="1.0" encoding="UTF-8"?>
<persistence version="1.0" xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd">
	<persistence-unit name="MySamplePersistence" transaction-type="JTA">
		<provider>org.hibernate.ejb.HibernatePersistence</provider>
		<jta-data-source>jdbc/MySampleDs</jta-data-source>
		<properties>
		 	<property name="hibernate.dialect" value="org.hibernate.dialect.OracleDialect"/>
		 	<property name="hibernate.transaction.manager_lookup_class" value="org.hibernate.transaction.WebSphereExtendedJTATransactionLookup"/> 
		</properties>
	</persistence-unit>
</persistence>

Exception:

[10/7/10 17:23:01:317 EDT] 00000019 SystemErr     R 52218 [WebContainer : 0] INFO org.hibernate.util.NamingHelper - JNDI InitialContext properties:{}
[10/7/10 17:23:01:458 EDT] 00000019 SystemErr     R javax.naming.NameNotFoundException: Name  not found in context "java:".
[10/7/10 17:23:01:458 EDT] 00000019 SystemErr     R 	at com.ibm.ws.naming.ipbase.NameSpace.getParentCtxInternal(NameSpace.java:1837)
[10/7/10 17:23:01:458 EDT] 00000019 SystemErr     R 	at com.ibm.ws.naming.ipbase.NameSpace.lookupInternal(NameSpace.java:1166)
[10/7/10 17:23:01:458 EDT] 00000019 SystemErr     R 	at com.ibm.ws.naming.ipbase.NameSpace.lookup(NameSpace.java:1095)
[10/7/10 17:23:01:458 EDT] 00000019 SystemErr     R 	at com.ibm.ws.naming.urlbase.UrlContextImpl.lookup(UrlContextImpl.java:1233)
[10/7/10 17:23:01:458 EDT] 00000019 SystemErr     R 	at com.ibm.ws.naming.java.javaURLContextImpl.lookup(javaURLContextImpl.java:395)

What JNDI URI needs to be used to lookup JPA EntityManager in Websphere environment?

[K Mansoor]

Did you ever figure this one out?

[Viji San]

I couldn't figure it out yet. As a work around, I implemented EAO in stateless bean, so, I am getting EntityManager through contain DI. Some thing like below,

@stateless

public class UserInfoDAO {

@PersistenceUnit (name ="MyPersistenceUnit")
private EntityManager em;

--
--

}

Please let me know if you could find it out. Thanks