I keep getting this when trying to run a very simple demo code:

ERROR [org.jboss.ws.jaxrpc.SOAPFaultExceptionHelper] SOAP request exception

java.lang.NoClassDefFoundError

 at org.jboss.ws.jaxrpc.encoding.SimpleDeserializer.deserialize(SimpleDeserializer.java:52)

 at org.jboss.ws.soap.SOAPContentElement.getObjectValue(SOAPContentElement.java:235)

 at org.jboss.ws.binding.EndpointInvocation.transformPayloadValue(EndpointInvocation.java:233)

 at org.jboss.ws.binding.EndpointInvocation.getRequestParamValue(EndpointInvocation.java:103)

 at org.jboss.ws.binding.EndpointInvocation.getRequestPayload(EndpointInvocation.java:117)

 at org.jboss.ws.integration.jboss.ServiceEndpointInvokerEJB3.invokeServiceEndpoint(ServiceEndpointInvokerEJB3.java:115)

 at org.jboss.ws.server.ServiceEndpointInvoker.invoke(ServiceEndpointInvoker.java:115)

 at org.jboss.ws.server.ServiceEndpoint.handleRequest(ServiceEndpoint.java:209)

 at org.jboss.ws.server.ServiceEndpointManager.processSOAPRequest(ServiceEndpointManager.java:355)

 at org.jboss.ws.server.StandardEndpointServlet.doPost(StandardEndpointServlet.java:115)

 at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)

 at org.jboss.ws.server.StandardEndpointServlet.service(StandardEndpointServlet.java:76)

 at javax.servlet.http.HttpServlet.service(HttpServlet.java:810)

 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)

 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)

 at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)

 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)

 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)

 at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)

 at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)

 at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:175)

 at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:74)

 at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)

 at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)

 at org.jboss.web.tomcat.tc5.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:156)

 at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)

 at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)

 at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869)

 at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:664)

 at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)

 at org.apache.tomcat.util.net.MasterSlaveWorkerThread.run(MasterSlaveWorkerThread.java:112)

 at java.lang.Thread.run(Thread.java:595)