Problema ejb + jsp + jboss5.0

12:50:47,445 ERROR [[jsp]] Servlet.service() for servlet jsp threw exception

java.lang.LinkageError: loader constraint violation: loader (instance of org/apache/jasper/servlet/JasperLoader) previously initiated loading for a different type with name "javax/servlet/http/HttpServletRequest"

at java.lang.Class.getDeclaredMethods0(Native Method)

at java.lang.Class.privateGetDeclaredMethods(Unknown Source)

at java.lang.Class.getDeclaredMethods(Unknown Source)

at org.jboss.injection.InjectionUtil.collapseXmlMethodInjectors(InjectionUtil.java:74)

at org.jboss.web.tomcat.service.injection.TomcatInjectionUtils.processDynamicBeanAnnotations(TomcatInjectionUtils.java:59)

at org.jboss.web.tomcat.service.TomcatInjectionContainer.processAnnotations(TomcatInjectionContainer.java:407)

at org.jboss.web.tomcat.service.TomcatInjectionContainer.processDynamicBeanAnnotations(TomcatInjectionContainer.java:382)

at org.jboss.web.tomcat.service.TomcatInjectionContainer.newInstance(TomcatInjectionContainer.java:274)

at org.jboss.web.tomcat.service.TomcatInjectionContainer.newInstance(TomcatInjectionContainer.java:265)

at org.apache.jasper.servlet.JspServletWrapper.getServlet(JspServletWrapper.java:145)

at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:324)

at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:322)

at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:249)

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.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(Unknown Source)