New Entity is not managed?

Question

I have created several EJB 3.0 persistence Entities using the wizard provided by netBeans 5.5 all with success. However, when I try to create my own persistent entity outside the wizard, I get an error when trying to use the .refresh method on it.
Why would it be a non managed object?
EJB5018: An exception was thrown during an ejb invocation on [PromoFacade]
javax.ejb.EJBException
at com.sun.ejb.containers.BaseContainer.processSystemException(BaseContainer.java:3730)
at com.sun.ejb.containers.BaseContainer.completeNewTx(BaseContainer.java:3630)
at com.sun.ejb.containers.BaseContainer.postInvokeTx(BaseContainer.java:3431)
at com.sun.ejb.containers.BaseContainer.postInvoke(BaseContainer.java:1247)
at com.sun.ejb.containers.EJBLocalObjectInvocationHandler.invoke(EJBLocalObjectInvocationHandler.java:192)
at com.sun.ejb.containers.EJBLocalObjectInvocationHandlerDelegate.invoke(EJBLocalObjectInvocationHandlerDelegate.java:118)
at $Proxy244.findByRootandPrefix(Unknown Source)
at highsmith.servlets.AddTo.processRequest(AddTo.java:185)
at highsmith.servlets.AddTo.doGet(AddTo.java:247)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:707)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
at org.apache.catalina.core.ApplicationFilterChain.servletService(ApplicationFilterChain.java:397)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:278)
at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:566)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:536)
at org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:240)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:179)
at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:566)
at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:73)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:182)
at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:566)
at com.sun.enterprise.web.VirtualServerPipeline.invoke(VirtualServerPipeline.java:120)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:939)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:137)
at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:566)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:536)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:939)
at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:239)
at com.sun.enterprise.web.connector.grizzly.ProcessorTask.invokeAdapter(ProcessorTask.java:667)
at com.sun.enterprise.web.connector.grizzly.ProcessorTask.processNonBlocked(ProcessorTask.java:574)
at com.sun.enterprise.web.connector.grizzly.ProcessorTask.process(ProcessorTask.java:844)
at com.sun.enterprise.web.connector.grizzly.ReadTask.executeProcessorTask(ReadTask.java:287)
at com.sun.enterprise.web.connector.grizzly.ReadTask.doTask(ReadTask.java:212)
at com.sun.enterprise.web.connector.grizzly.TaskBase.run(TaskBase.java:252)
at com.sun.enterprise.web.connector.grizzly.WorkerThread.run(WorkerThread.java:75)
Caused by: java.lang.IllegalArgumentException: Can not refresh not managed object: [highsmith.entities.Promo[item_number=10078]].

Answer 1

Here is the code for the entire entity. it includes the code to declare the entity manager. I am not doing anything else except declaring the em object.
* PromoFacade.java
* Created on March 14, 2007, 8:37 AM
* To change this template, choose Tools | Template Manager
* and open the template in the editor.
package highsmith.ejbs;
import highsmith.entities.Promo;
import java.util.List;
import javax.ejb.Stateless;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import javax.persistence.Query;
* @author pamadon
@Stateless
public class PromoFacade implements PromoFacadeLocal {
     @PersistenceContext
     private EntityManager em;
    /** Creates a new instance of PromoFacade */
    public PromoFacade() {
     public void create(Promo promo) {
          em.persist(promo);
     public void edit(Promo promo) {
          em.merge(promo);
     public void destroy(Promo promo) {
          em.merge(promo);
          em.remove(promo);
     public Promo find(Object pk) {
          return (Promo) em.find(Promo.class, pk);
     public List findAll() {
          return em.createQuery("select object(o) from Promo as o").getResultList();
     /** Created 03/14/07 PA
     * creates a new List of Promo instances using the root.
     public List findByRoot(String root) {
         //  built by PA
            Query query = em.createNamedQuery("Promo.findByRoot");
         query.setParameter("root", root);
         List<Promo> list = (List) query.getResultList();
            em.refresh(list);
         return list;
     /** Created 03/14/07 PA
     * creates a new instance of Promo using the root and prefix.  Returns a single promo instance
     public Promo findByRootandPrefix(String root, String prefix) {
         //  built by PA
            Query query = em.createNamedQuery("Promo.findByRootandPrefix");
         query.setParameter("item_number", root+"%");
         query.setParameter("prefix", prefix);
         List <Promo>list = (List) query.getResultList();
         em.merge(list);
            em.refresh(list);
         Promo returnedPromo = null;
         for (Promo promo : list) {
         //  just loop thru the list & return the last one.  if any root/suffix combo is on promo, the entire root will be too by rule.
          returnedPromo = promo; 
         return returnedPromo;
}Thanks!