Lookup com EJB 3.0 usando Jboss 5.1 GA não funcionna!

Galera! Boa tarde, estou a 3 dias com esse problema ! Tenho uma aplicação que rodando no Jboss 5.1 GA. Tudo está funcionando, menos quando uso o EJB para fazer um lookup e tomo esse erro descrito abaixo !

javax.naming.CommunicationException [Root exception is java.lang.ClassNotFoundException: org.jboss.ejb3.JBossProxy (no security manager: RMI class loader disabled)]
	at org.jnp.interfaces.NamingContext.lookup(NamingContext.java:845)
	at org.jnp.interfaces.NamingContext.lookup(NamingContext.java:686)
	at javax.naming.InitialContext.lookup(InitialContext.java:392)
	at com.m4u.compracoletiva.callcenter.web.ServiceLocator.createMediaManager(ServiceLocator.java:93)
	at com.m4u.compracoletiva.callcenter.web.app.action.UserInfoAction.findCoupon(UserInfoAction.java:508)
	at com.m4u.compracoletiva.callcenter.web.app.action.UserInfoAction.paginationByDemand(UserInfoAction.java:231)
	at com.m4u.compracoletiva.callcenter.web.app.action.UserInfoAction.dispatchMethod(UserInfoAction.java:151)
	at org.apache.struts.actions.DispatchAction.execute(DispatchAction.java:170)
	at org.apache.struts.chain.commands.servlet.ExecuteAction.execute(ExecuteAction.java:58)
	at org.apache.struts.chain.commands.AbstractExecuteAction.execute(AbstractExecuteAction.java:67)
	at org.apache.struts.chain.commands.ActionCommandBase.execute(ActionCommandBase.java:51)
	at org.apache.commons.chain.impl.ChainBase.execute(ChainBase.java:191)
	at org.apache.commons.chain.generic.LookupCommand.execute(LookupCommand.java:305)
	at org.apache.commons.chain.impl.ChainBase.execute(ChainBase.java:191)
	at org.apache.struts.chain.ComposableRequestProcessor.process(ComposableRequestProcessor.java:283)
	at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1913)
	at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:462)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:235)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
	at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:190)
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:525)
	at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:92)
	at org.jboss.web.tomcat.security.SecurityContextEstablishmentValve.process(SecurityContextEstablishmentValve.java:126)
	at org.jboss.web.tomcat.security.SecurityContextEstablishmentValve.invoke(SecurityContextEstablishmentValve.java:70)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
	at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:158)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:330)
	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:829)
	at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:598)
	at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
	at java.lang.Thread.run(Thread.java:662)

tem bastante coisa

https://community.jboss.org/thread/120668

http://www.google.com.br/search?hl=pt&source=hp&q=[Root+exception+is+java.lang.ClassNotFoundException%3A+org.jboss.ejb3.JBossProxy+(no+security+manager%3A+RMI+class+loader+disabled)]&btnG=Pesquisa+Google&gbv=2

http://www.google.com.br/search?q=no+security+manager%3A+RMI+class+loader+disabled&btnG=Pesquisar&hl=pt&gbv=2

http://www.coderanch.com/t/164030/java-EJB-SCBCD/certification/ejb-proxy-erro