Bonjour,

je sèche sur un problème d'entitymanager visiblement null.

J'utilise :
- EJB 3
- JBOSS 5 (avec hibernate comme outil de persistence)
- une base mysql

Le projet est vraiment simple (un essai pour m'entraîner) :

un entity bean book :

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/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
 
package org.model;
 
import java.io.Serializable;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
 
/**
 *
 */
@Entity
public class Book implements Serializable {
    private static final long serialVersionUID = 1L;
    @Id
    @GeneratedValue(strategy = GenerationType.TABLE)
    private Long id;    
    private String title;
 
    public Book() {
    }
 
 
 
    public Book(String title){
        this.title = title;
    }
 
    public Long getId() {
        return id;
    }
 
    public void setId(Long id) {
        this.id = id;
    }
 
    @Override
    public int hashCode() {
        int hash = 0;
        hash += (id != null ? id.hashCode() : 0);
        return hash;
    }
 
    @Override
    public boolean equals(Object object) {
        // TODO: Warning - this method won't work in the case the id fields are not set
        if (!(object instanceof Book)) {
            return false;
        }
        Book other = (Book) object;
        if ((this.id == null && other.id != null) || (this.id != null && !this.id.equals(other.id))) {
            return false;
        }
        return true;
    }
 
    @Override
    public String toString() {
        return "org.model.Book[id=" + id + "]";
    }
 
}
Une interface remote pour le session bean
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@Remote
public interface BookServiceRemote {
    void createOrUpdate(Book book);
    void remove(Book book);
    Book find(Object id);
}
Le session bean stateless

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package org.model;
 
import javax.ejb.Stateless;
import javax.ejb.TransactionAttribute;
import javax.ejb.TransactionAttributeType;
import javax.ejb.TransactionManagement;
import javax.ejb.TransactionManagementType;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
 
/**
 *
 * @author Onizuka
 */
@TransactionManagement(TransactionManagementType.CONTAINER)
@TransactionAttribute (TransactionAttributeType.REQUIRED)
@Stateless
public class BookService implements BookServiceRemote {
    @PersistenceContext
    private EntityManager em;
 
    @TransactionAttribute (TransactionAttributeType.REQUIRED)
    public void createOrUpdate(Book book) {
        System.out.println("create or update");
 
        em.merge(book);
    }
 
    @TransactionAttribute (TransactionAttributeType.REQUIRED)
    public void remove(Book book) {
        em.remove(book);
 
    }
 
    @TransactionAttribute (TransactionAttributeType.REQUIRED)
    public Book find(Object id) {
    return null;
    }
 
    // Add business logic below. (Right-click in editor and choose
    // "Insert Code > Add Business Method")
 
}
un test Junit pour tester mon ejb

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/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
 
package org.model;
 
import java.util.Hashtable;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import javax.rmi.PortableRemoteObject;
import org.junit.After;
import org.junit.AfterClass;
import org.junit.Before;
import org.junit.BeforeClass;
import org.junit.Test;
import static org.junit.Assert.*;
 
/**
 *
 * @author Onizuka
 */
public class BookServiceTest {
 
    public BookServiceTest() {
    }
 
    @BeforeClass
    public static void setUpClass() throws Exception {
    }
 
    @AfterClass
    public static void tearDownClass() throws Exception {
    }
 
    @Before
    public void setUp() {
    }
 
    @After
    public void tearDown() {
    }
 
    /**
     * Test of createOrUpdate method, of class BookService.
     */
    @Test
    public void testCreateOrUpdate() {
        try {
            Hashtable ht = new Hashtable();
            ht.put("java.naming.factory.initial", "org.jnp.interfaces.NamingContextFactory");
            ht.put("java.naming.factory.url.pkgs", "org.jboss.naming:org.jnp.interfaces");
            ht.put("java.naming.provider.url", "jnp://localhost:1099");
            InitialContext ctx;
            ctx = new InitialContext(ht);
            Object ref = ctx.lookup("java:/BookService/remote");
            BookServiceRemote bServ = (BookServiceRemote) PortableRemoteObject.narrow(ref,BookServiceRemote.class);
            Book b = new Book("livre1");
            bServ.createOrUpdate(b);
            /*
            System.out.println("createOrUpdate");
            Book book = null;
            BookService instance = new BookService();
            Book expResult = null;
            Book result = instance.createOrUpdate(book);
            assertEquals(expResult, result);
            // TODO review the generated test code and remove the default call to fail.
            fail("The test case is a prototype.");*/
        } catch (NamingException ex) {
            Logger.getLogger(BookServiceTest.class.getName()).log(Level.SEVERE, null, ex);
        }
 
    }
 
    /**
     * Test of remove method, of class BookService.
     */
    /*
    @Test
    public void testRemove() {
        System.out.println("remove");
        Book book = null;
        BookService instance = new BookService();
        instance.remove(book);
        // TODO review the generated test code and remove the default call to fail.
        fail("The test case is a prototype.");
    }*/
 
    /**
     * Test of find method, of class BookService.
     */
    /*
    @Test
    public void testFind() {
        System.out.println("find");
        Object id = null;
        BookService instance = new BookService();
        Book expResult = null;
        Book result = instance.find(id);
        assertEquals(expResult, result);
        // TODO review the generated test code and remove the default call to fail.
        fail("The test case is a prototype.");
    }*/
 
}
mon persistence.xml :
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<?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="SamplePU" transaction-type="JTA">
    <provider>org.hibernate.ejb.HibernatePersistence</provider>
    <jta-data-source>java:/samplejndi</jta-data-source>
    <exclude-unlisted-classes>false</exclude-unlisted-classes>
    <properties>
      <property name="hibernate.hbm2ddl.auto" value="create-drop"/>
    </properties>
  </persistence-unit>
</persistence>
A l'exécution du test j'obtiens l'erreur

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Testcase: testCreateOrUpdate(org.model.BookServiceTest):        Caused an ERROR
java.lang.NullPointerException
javax.ejb.EJBException: java.lang.NullPointerException
        at org.jboss.ejb3.tx.Ejb3TxPolicy.handleExceptionInOurTx(Ejb3TxPolicy.java:77)
        at org.jboss.aspects.tx.TxPolicy.invokeInOurTx(TxPolicy.java:83)
        at org.jboss.aspects.tx.TxInterceptor$Required.invoke(TxInterceptor.java:190)
        at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
        at org.jboss.aspects.tx.TxPropagationInterceptor.invoke(TxPropagationInterceptor.java:76)
        at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
        at org.jboss.ejb3.tx.NullInterceptor.invoke(NullInterceptor.java:42)
        at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
        at org.jboss.ejb3.security.RoleBasedAuthorizationInterceptorv2.invoke(RoleBasedAuthorizationInterceptorv2.java:201)
        at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
        at org.jboss.ejb3.security.Ejb3AuthenticationInterceptorv2.invoke(Ejb3AuthenticationInterceptorv2.java:186)
        at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
        at org.jboss.ejb3.ENCPropagationInterceptor.invoke(ENCPropagationInterceptor.java:41)
        at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
        at org.jboss.ejb3.asynchronous.AsynchronousInterceptor.invoke(AsynchronousInterceptor.java:106)
        at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
        at org.jboss.ejb3.BlockContainerShutdownInterceptor.invoke(BlockContainerShutdownInterceptor.java:67)
        at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
        at org.jboss.aspects.currentinvocation.CurrentInvocationInterceptor.invoke(CurrentInvocationInterceptor.java:67)
        at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
        at org.jboss.ejb3.stateless.StatelessContainer.dynamicInvoke(StatelessContainer.java:487)
        at org.jboss.ejb3.session.InvokableContextClassProxyHack._dynamicInvoke(InvokableContextClassProxyHack.java:53)
        at org.jboss.aop.Dispatcher.invoke(Dispatcher.java:91)
        at org.jboss.aspects.remoting.AOPRemotingInvocationHandler.invoke(AOPRemotingInvocationHandler.java:82)
        at org.jboss.remoting.ServerInvoker.invoke(ServerInvoker.java:908)
        at org.jboss.remoting.transport.socket.ServerThread.completeInvocation(ServerThread.java:742)
        at org.jboss.remoting.transport.socket.ServerThread.processInvocation(ServerThread.java:695)
        at org.jboss.remoting.transport.socket.ServerThread.dorun(ServerThread.java:522)
        at org.jboss.remoting.transport.socket.ServerThread.run(ServerThread.java:230)
Caused by: java.lang.NullPointerException
        at org.model.BookService.createOrUpdate(BookService.java:30)
        at org.jboss.aop.joinpoint.MethodInvocation.invokeTarget(MethodInvocation.java:122)
        at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:111)
        at org.jboss.ejb3.EJBContainerInvocationWrapper.invokeNext(EJBContainerInvocationWrapper.java:69)
        at org.jboss.ejb3.interceptors.aop.InterceptorSequencer.invoke(InterceptorSequencer.java:73)
        at org.jboss.ejb3.interceptors.aop.InterceptorSequencer.aroundInvoke(InterceptorSequencer.java:59)
        at org.jboss.aop.advice.PerJoinpointAdvice.invoke(PerJoinpointAdvice.java:174)
        at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
        at org.jboss.ejb3.interceptors.aop.InvocationContextInterceptor.fillMethod(InvocationContextInterceptor.java:72)
        at org.jboss.aop.advice.org.jboss.ejb3.interceptors.aop.InvocationContextInterceptor_z_fillMethod_12254630.invoke(InvocationContextInterceptor_z_fillMethod_12254630.java)
        at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
        at org.jboss.ejb3.interceptors.aop.InvocationContextInterceptor.setup(InvocationContextInterceptor.java:88)
        at org.jboss.aop.advice.org.jboss.ejb3.interceptors.aop.InvocationContextInterceptor_z_setup_12254630.invoke(InvocationContextInterceptor_z_setup_12254630.java)
        at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
        at org.jboss.ejb3.connectionmanager.CachedConnectionInterceptor.invoke(CachedConnectionInterceptor.java:62)
        at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
        at org.jboss.ejb3.entity.TransactionScopedEntityManagerInterceptor.invoke(TransactionScopedEntityManagerInterceptor.java:56)
        at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
        at org.jboss.ejb3.AllowedOperationsInterceptor.invoke(AllowedOperationsInterceptor.java:47)
        at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
        at org.jboss.ejb3.tx.NullInterceptor.invoke(NullInterceptor.java:42)
        at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
        at org.jboss.ejb3.stateless.StatelessInstanceInterceptor.invoke(StatelessInstanceInterceptor.java:68)
        at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
        at org.jboss.aspects.tx.TxPolicy.invokeInOurTx(TxPolicy.java:79)
        at org.jboss.aspects.tx.TxInterceptor$Required.invoke(TxInterceptor.java:190)
        at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
        at org.jboss.aspects.tx.TxPropagationInterceptor.invoke(TxPropagationInterceptor.java:76)
        at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
        at org.jboss.ejb3.tx.NullInterceptor.invoke(NullInterceptor.java:42)
        at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
        at org.jboss.ejb3.security.RoleBasedAuthorizationInterceptorv2.invoke(RoleBasedAuthorizationInterceptorv2.java:201)
        at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
        at org.jboss.ejb3.security.Ejb3AuthenticationInterceptorv2.invoke(Ejb3AuthenticationInterceptorv2.java:186)
        at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
        at org.jboss.ejb3.ENCPropagationInterceptor.invoke(ENCPropagationInterceptor.java:41)
        at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
        at org.jboss.ejb3.asynchronous.AsynchronousInterceptor.invoke(AsynchronousInterceptor.java:106)
        at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
        at org.jboss.ejb3.BlockContainerShutdownInterceptor.invoke(BlockContainerShutdownInterceptor.java:67)
        at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
        at org.jboss.aspects.currentinvocation.CurrentInvocationInterceptor.invoke(CurrentInvocationInterceptor.java:67)
        at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
        at org.jboss.ejb3.stateless.StatelessContainer.dynamicInvoke(StatelessContainer.java:487)
        at org.jboss.ejb3.session.InvokableContextClassProxyHack._dynamicInvoke(InvokableContextClassProxyHack.java:53)
        at org.jboss.aop.Dispatcher.invoke(Dispatcher.java:91)
        at org.jboss.aspects.remoting.AOPRemotingInvocationHandler.invoke(AOPRemotingInvocationHandler.java:82)
        at org.jboss.remoting.ServerInvoker.invoke(ServerInvoker.java:908)
        at org.jboss.remoting.transport.socket.ServerThread.completeInvocation(ServerThread.java:742)
        at org.jboss.remoting.transport.socket.ServerThread.processInvocation(ServerThread.java:695)
        at org.jboss.remoting.transport.socket.ServerThread.dorun(ServerThread.java:522)
        at org.jboss.remoting.transport.socket.ServerThread.run(ServerThread.java:230)
        at org.jboss.remoting.MicroRemoteClientInvoker.invoke(MicroRemoteClientInvoker.java:206)
        at org.jboss.remoting.Client.invoke(Client.java:1708)
        at org.jboss.remoting.Client.invoke(Client.java:612)
        at org.jboss.aspects.remoting.InvokeRemoteInterceptor.invoke(InvokeRemoteInterceptor.java:60)
        at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
        at org.jboss.aspects.tx.ClientTxPropagationInterceptor.invoke(ClientTxPropagationInterceptor.java:61)
        at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
        at org.jboss.ejb3.security.client.SecurityClientInterceptor.invoke(SecurityClientInterceptor.java:65)
        at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
        at org.jboss.ejb3.remoting.IsLocalInterceptor.invoke(IsLocalInterceptor.java:74)
        at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
        at org.jboss.aspects.remoting.PojiProxy.invoke(PojiProxy.java:62)
        at $Proxy11.invoke(Unknown Source)
        at org.jboss.ejb3.proxy.handler.ProxyInvocationHandlerBase.invoke(ProxyInvocationHandlerBase.java:261)
        at org.jboss.ejb3.proxy.handler.session.SessionSpecProxyInvocationHandlerBase.invoke(SessionSpecProxyInvocationHandlerBase.java:101)
        at $Proxy10.createOrUpdate(Unknown Source)
        at org.model.BookServiceTest.testCreateOrUpdate(BookServiceTest.java:61)
        at org.jboss.aspects.remoting.InvokeRemoteInterceptor.invoke(InvokeRemoteInterceptor.java:72)
        at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
        at org.jboss.aspects.tx.ClientTxPropagationInterceptor.invoke(ClientTxPropagationInterceptor.java:61)
        at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
        at org.jboss.ejb3.security.client.SecurityClientInterceptor.invoke(SecurityClientInterceptor.java:65)
        at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
        at org.jboss.ejb3.remoting.IsLocalInterceptor.invoke(IsLocalInterceptor.java:74)
        at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
        at org.jboss.aspects.remoting.PojiProxy.invoke(PojiProxy.java:62)
        at $Proxy11.invoke(Unknown Source)
        at org.jboss.ejb3.proxy.handler.ProxyInvocationHandlerBase.invoke(ProxyInvocationHandlerBase.java:261)
        at org.jboss.ejb3.proxy.handler.session.SessionSpecProxyInvocationHandlerBase.invoke(SessionSpecProxyInvocationHandlerBase.java:101)
        at $Proxy10.createOrUpdate(Unknown Source)
        at org.model.BookServiceTest.testCreateOrUpdate(BookServiceTest.java:61)
qui me renvoie sur la ligne :

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   em.merge(book);
pouvez-vous m'aider ?

merci bcp