title: em.createQuery keeps returning null
body: <p>I have this application which i use JSF 2.0 and EclipseLink, i have entities created for a database made in MySQL, Created these entities using netbeans 7.1.2, it gets created automaticly.</p>
  
  <p>Then i use session beans to work with these entities, the thing is the <code>em.createQuery</code> always returns a null, though I checked NamedQueries in the entities and they perfectly match</p>
  
  <p>a sample from the entities named queries:-</p>
  
  <pre><code>@NamedQueries({
      @NamedQuery(name = "Users.findAll", query = "SELECT u FROM Users u"),
      @NamedQuery(name = "Users.findByUserId", query = "SELECT u FROM Users u WHERE u.userId = :userId"),
      @NamedQuery(name = "Users.findByUsername", query = "SELECT u FROM Users u WHERE u.username = :username"),
      @NamedQuery(name = "Users.findByEmail", query = "SELECT u FROM Users u WHERE u.email = :email"),
  </code></pre>
  
  <p>notice how i use this findByEmail query in the session bean :-</p>
  
  <pre><code>public Users findByEmail(String email){
          em.getTransaction().begin();
          String find = "Users.findByEmail";
          Query query = em.createNamedQuery(find);
          query.setParameter("email", email);
          Users user = (Users) query.getSingleResult();
  </code></pre>
  
  <p>but it always returns null from this em.createNamedQuery, i tried using .createQuery first but it also was no good.</p>
  
  <p>the stacktrace of the exception</p>
  
  <pre><code>Caused by: java.lang.NullPointerException
      at com.readme.entities.sessionBeans.UsersFacade.findByEmail(UsersFacade.java:48)
      at com.readme.user.signup.SignupBean.checkAvailability(SignupBean.java:137)
      at com.readme.user.signup.SignupBean.save(SignupBean.java:146)
      at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
      at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
      at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
      at java.lang.reflect.Method.invoke(Method.java:601)
  </code></pre>
  
  <p>What Seems To Be The Problem Here ?</p>