[EJB] ClassNotFoundException au déploiement

Bonjour,

Excusez moi pour ces questions de debutants mais mais c'est ma premiere appli avec des ejb!!!

Voila lorsque je deploie mes ejb il met ce message d'erreur
Sachant que ma datasource est bien deploye et ma base demarré

Merci de votre aide
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08:36:58,328 : JContainer.addBean : Impossible to instanciate the entity factory
: jorm.rdb.mysql.EventFormationBeanMapping
java.lang.ClassNotFoundException: jorm.rdb.mysql.EventFormationBeanMapping
        at java.net.URLClassLoader$1.run(URLClassLoader.java:199)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:187)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:289)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:235)
        at org.objectweb.jonas_ejb.container.JContainer.addBean(JContainer.java:
302)
        at org.objectweb.jonas.container.EJBServiceImpl.createContainer(EJBServi
ceImpl.java:606)
        at org.objectweb.jonas.container.EJBServiceImpl.createContainerMBean(EJB
ServiceImpl.java:951)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.
java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces
sorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:324)
        at mx4j.server.ReflectionMBeanInvoker.invokeImpl(ReflectionMBeanInvoker.
java:152)
        at mx4j.server.ReflectionMBeanInvoker.doInvoke(ReflectionMBeanInvoker.ja
va:119)
        at mx4j.server.ReflectionMBeanInvoker.invoke(ReflectionMBeanInvoker.java
:54)
        at mx4j.server.interceptor.InvokerMBeanServerInterceptor.invoke(InvokerM
BeanServerInterceptor.java:235)
        at mx4j.server.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultM
BeanServerInterceptor.java:121)
        at mx4j.server.interceptor.SecurityMBeanServerInterceptor.invoke(Securit
yMBeanServerInterceptor.java:86)
        at mx4j.server.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultM
BeanServerInterceptor.java:121)
        at mx4j.server.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultM
BeanServerInterceptor.java:121)
        at mx4j.server.interceptor.ContextClassLoaderMBeanServerInterceptor.invo
ke(ContextClassLoaderMBeanServerInterceptor.java:205)
        at mx4j.server.MX4JMBeanServer.invoke(MX4JMBeanServer.java:1079)
        at org.objectweb.jonas.jmx.RMIConnectorImpl.invoke(RMIConnectorImpl.java
:147)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.
java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces
sorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:324)
        at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:261)
        at org.objectweb.carol.rmi.jrmp.server.JUnicastServerRef.runDispatch(JUn
icastServerRef.java:165)
        at org.objectweb.carol.rmi.jrmp.server.JUnicastServerRef.dispatch(JUnica
stServerRef.java:149)
        at sun.rmi.transport.Transport$1.run(Transport.java:148)
        at java.security.AccessController.doPrivileged(Native Method)
        at sun.rmi.transport.Transport.serviceCall(Transport.java:144)
        at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:4
60)
        at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport
.java:701)
        at java.lang.Thread.run(Thread.java:534)