JSF calls DAO layer based on JPA/Hibernate throws NPE

Question

I'm new in JSF and Hibernate;
I'm using Hibernate as JPA provider, the dataaccess is tied to DAO layer; when my JSF controller(UserController) calls the getUsers() of my DAO layer
(Glassfish is the app Server I use)
NullpointerException is thrown, I assume it's because instance of BasicDAO is initialized, where do I have to instantiate BasicDAO
here is my code :
public class BasicDAO {      
@PersistenceUnit(unitName = "test5PU")
private EntityManager entityManager;
public void setEntityManager(EntityManager entityManager)
{        this.entityManager = entityManager;    }
public List getUsers() {       
Query query = entityManager.createNamedQuery("User.findAllUsers");
return query.getResultList();
public User findUser(String id) {       
try{
Query q = entityManager.createNamedQuery("User.findByIdUser");
User o = (User)q.getSingleResult();
return o;
} finally {
entityManager.close();
public class UserController {
/** Creates a new instance of UserController */
public UserController() {      
private DataModel model;
private BasicDAO basicDAO;
public DataModel getUsers() {            
return new ListDataModel(basicDAO.getUsers());
public void setBasicDAO(BasicDAO basicDAO) {     
this.basicDAO = basicDAO;
public BasicDAO getBasicDAO() {           
return this.basicDAO;
public User findUser(String id) {
return basicDAO.findUser(id);
List.jsp :
<h:dataTable value='#{user.users}' var='item' border="1" cellpadding="2" cellspacing="0">
<h:column>
<f:facet name="header">
<h:outputText value="IdUser"/>
</f:facet>
<h:outputText value="#{item.idUser}"/>
</h:column>
<h:column>
<f:facet name="header">
<h:outputText value="Password"/>
</f:facet>
<h:outputText value="#{item.password}"/>
</h:column>
</h:dataTable>

Answer 1

in fact, i did some tests, and the reason why the NPE happens revealed to be caused by the call to
this.emf = Persistence.createEntityManagerFactory(persistenceUnitName, emfProperties);
which returns NULL value, and later when emf is accessed to create entitymanager NullPointerException is thrown.
I think there is a configuration probem some where, except in persistence.xml file. my persistence.xml content is :
<?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="test9PU" transaction-type="JTA">
<provider>org.hibernate.ejb.HibernatePersistence</provider>
<jta-data-source>JeeCertDB</jta-data-source>
<class>persistence.user.User</class>
<properties>
<property name="hibernate.jdbc.driver"
value="com.mysql.jdbc.Driver" />
<property name="hibernate.jdbc.url"
value="jdbc:mysql://localhost:3306/JeeCertDB" />
<property name="hibernate.jdbc.user" value="root" />
<property name="hibernate.jdbc.password" value="belly" />
<property name="hibernate.logging.level" value="INFO" />
</properties>
</persistence-unit>
</persistence>
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