java - No Persistence provider found -

i getting following error when using jboss 4.2.3 ga , configured ms-sql.ds file. created entity bean ejb3 , trying access entity bean ejb 2.1 session bean. first of all, wanted check if possible. because when use entitymanager or entitymanagerfactory, entitymanager comming null. instead if use entitymanagerfactory, gives error saying:

javax.persistence.persistenceexception: no persistence provider entitymanager named ejbcomponentpu

below class

public class testbean implements sessionbean {  //pass persistence unit entitymanager. @persistencecontext(unitname="ejbcomponentpu")  private entitymanager entitymanager; 

my project folder structure is:

src - has packages. inside have meta-inf folder has persistence.xml file

thanks help.

this persistence.xml file.

<?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="ejbcomponentpu" transaction-type="jta">       <provider>org.hibernate.ejb.hibernatepersistence</provider>       <jta-data-source>java:/testds</jta-data-source>        <exclude-unlisted-classes>false</exclude-unlisted-classes>    </persistence-unit>