define transaction lookup, injectio of EntityManager

[erzed]

Hi everybody!

I've got 2 problems I'd like to helped with.

I'm just startet working with JBoss and I'm using the 4.0.4RC1 version of it. During the start up i get the following warning output:

WARN [TreeCache] No transaction manager lookup class has been defined. Transactions cannot be used

1.) Now where can I define this transaction manager look up class?

And I'm trying to inject an EntityManager into a stateless Session Bean. However, I don't get an instance of it. I've written a persistence.xml file :

<persistence 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"
 version="1.0">
 <persistence-unit name="persistenceSample">
 <provider>org.hibernate.ejb.HibernatePersistence</provider>
 <jta-data-source>java:/DefaultDS</jta-data-source>
 <properties>
 <property name="hibernate.dialect"
 value="org.hibernate.dialect.HSQLDialect" />
 <property name="hibernate.hbm2ddl.auto" value="create-drop" />
 </properties>
 </persistence-unit>
</persistence>

And in the bean class I'm trying to inject an EntityManager by

@PersistenceContext(unitName="persistenceSample")
private EntityManager manager;

But, I already get a Waring from JBoss when deploying the beans, which I've put into a jar file.

WARN [ServiceController] Problem starting service persistence.units:jar=DistSampleBeans.jar.jar,unitName=persistenceSample
java.lang.reflect.InvocationTargetException
... lots of method names where the exception goes up the call stack ...

Does this have something to do with the fact that no Transaction Manager look-up class has been defined?

I tried to get an instance of the EntityManager by using an EntityManagerFactory as well:

Map<String, String> properties = new HashMap<String, String>();
EntityManagerFactory emf = Persistence
 .createEntityManagerFactory("persistenceSample", properties);

EntityManager manager = emf.getEntityManager();

Either with or without the properties Map --> no success. The outcome is a NullPointerException.

2.) What am I doing wrong?