Error when trying to use an extended persistence context in EJB 3

[Amitav Chowdhury]

Hi,

I am trying to using a stateful session bean to update an entity using extended persistence context. But I get the following error when trying to access the stateful bean from a standalone class:


Caused by: java.lang.IllegalStateException: Extended Persistence Contexts can only be invoked from within the context of the stateful session bean that declares the Extended Persistence Context.
at weblogic.deployment.ExtendedEntityManagerProxyImpl.getPersistenceContext(ExtendedEntityManagerProxyImpl.java:61)
at weblogic.deployment.BasePersistenceContextProxyImpl.invoke(BasePersistenceContextProxyImpl.java:88)
at weblogic.deployment.BasePersistenceContextProxyImpl.invoke(BasePersistenceContextProxyImpl.java:80)
at weblogic.deployment.ExtendedEntityManagerProxyImpl.invoke(ExtendedEntityManagerProxyImpl.java:14)
at $Proxy114.toString(Unknown Source)
at java.lang.String.valueOf(String.java:2826)
at java.lang.StringBuilder.append(StringBuilder.java:115)
at containerNamagedEM.DeptServiceImpl.init(DeptServiceImpl.java:26)
... 40 more


Below is my stateful bean class

@Remote
public interface DeptService {	
	void init();
	void setDeptName(String name);
}

@Stateful(mappedName="DeptService")
public class DeptServiceImpl implements DeptService,Serializable{
	
	@PersistenceContext(unitName="Chap-05",type=PersistenceContextType.EXTENDED)
	EntityManager em;
	Department dept;
	
	@PostActivate
	@PostConstruct
	@Override
	public void init() {
		System.out.println("EM:" +em);
		dept= em.find(Department.class, 1);
		System.out.println("found department "+dept.getDeptName());
	}

	@Override
	@Remove
	public void setDeptName(String name) {
		dept.setDeptName(name);		
	}
	
	@PreDestroy
	@PrePassivate
	private void destroy(){
		em=null;
	}
}

The standalone test class to access the session bean:

public class DeptServiceTest {
	public static void main(String[] args) {
		// TODO Auto-generated method stub

		Hashtable<String, String> prop = new Hashtable<String, String>();
		prop.put(Context.INITIAL_CONTEXT_FACTORY,
				"weblogic.jndi.WLInitialContextFactory");
		prop.put(Context.PROVIDER_URL, "t3://localhost:7001");

		Context context;
		try {
			context = new InitialContext(prop);
			DeptService ser = (DeptService) context
					.lookup("DeptService#containerNamagedEM.DeptService");

			ser.init();
			ser.setDeptName("COMMON");
		} catch (NamingException e) {
			e.printStackTrace();
		}

	}
}

I am using weblogic 10 and below is my persistence.xml:

<?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="Chap-05" transaction-type="JTA">
	<provider>kodo.persistence.PersistenceProviderImpl</provider>
		<jta-data-source>ejbDataSource</jta-data-source>
		
		<class>containerNamagedEM.Department</class>
		<properties>
			<property name="kodo.jdbc.SynchronizeMappings" value="refresh"/>
		</properties>
	</persistence-unit>
</persistence>

Can someone help me to solve this issue?

Thanks in advance,
Amitava