Message d'erreur bean.findContact

salut tout le monde
j'ai un problème avec la session bean la méthode 'findContact' chercher les contacte mais message d'erreur

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Exception in thread "main" java.lang.NullPointerException
	at org.jboss.ejb3.stateless.StatelessContainer.dynamicInvoke(StatelessContainer.java:379)
	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:891)
	at org.jboss.remoting.transport.socket.ServerThread.completeInvocation(ServerThread.java:744)
	at org.jboss.remoting.transport.socket.ServerThread.processInvocation(ServerThread.java:697)
	at org.jboss.remoting.transport.socket.ServerThread.dorun(ServerThread.java:524)
	at org.jboss.remoting.transport.socket.ServerThread.run(ServerThread.java:232)
	at org.jboss.remoting.MicroRemoteClientInvoker.invoke(MicroRemoteClientInvoker.java:211)
	at org.jboss.remoting.Client.invoke(Client.java:1724)
	at org.jboss.remoting.Client.invoke(Client.java:629)
	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 $Proxy3.invoke(Unknown Source)
	at org.jboss.ejb3.proxy.impl.handler.session.SessionProxyInvocationHandlerBase.invoke(SessionProxyInvocationHandlerBase.java:207)
	at org.jboss.ejb3.proxy.impl.handler.session.SessionProxyInvocationHandlerBase.invoke(SessionProxyInvocationHandlerBase.java:164)
	at $Proxy2.findContact(Unknown Source)
	at ejb.MyBeanClient.main(MyBeanClient.java:34)
	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 $Proxy3.invoke(Unknown Source)
	at org.jboss.ejb3.proxy.impl.handler.session.SessionProxyInvocationHandlerBase.invoke(SessionProxyInvocationHandlerBase.java:207)
	at org.jboss.ejb3.proxy.impl.handler.session.SessionProxyInvocationHandlerBase.invoke(SessionProxyInvocationHandlerBase.java:164)
	at $Proxy2.findContact(Unknown Source)
	at ejb.MyBeanClient.main(MyBeanClient.java:34)

voila le code

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import javax.ejb.Stateless;
import javax.persistence.*;
import entityBeans.Contact;
 
 
@Stateless
public class MyBean implements MyBeanRemote, MyBeanLocal {
 
 
 
@PersistenceContext(unitName="mus")
    EntityManager em;
      public Contact findContact(int id) {
    	 return em.find(Contact.class, id);
    	 }
 
     }

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public interface IMyBean extends Serializable {   
         public Contact findContact(int contact);
 
 
}

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import javax.ejb.Remote;
 
@Remote
public interface MyBeanRemote extends IMyBean  {
 
}

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package ejb;
 
 
 import javax.naming.InitialContext;
import javax.naming.NamingException;
 
import entityBeans.Contact;
public class MyBeanClient {
 
	private static final Contact Contact = null;
 
	/**
         * @param args
         */
	public static void main(String[] args) {
		 try {
 
			    System.setProperty("java.naming.factory.initial","org.jnp.interfaces.NamingContextFactory");
			   System.setProperty("java.naming.provider.url", "localhost:1099");
 
			   InitialContext ctx = new InitialContext();           
			   MyBeanRemote bean = (MyBeanRemote) ctx.lookup("MyBean/remote");
			    Contact con = bean.findContact(1);
	 		   con.getFirstName();
 
 
 
			        } catch (NamingException e) {
			            e.printStackTrace();
			        }
 
	}
 
}

merci d'avance