Your class should implement java.io.Serializable and contains these parameter and methods :

   private static org.apache.axis.description.TypeDesc typeDesc =
        new org.apache.axis.description.TypeDesc(User.class, true);

    static {
        typeDesc.setXmlType(new javax.xml.namespace.QName("Url of User class", "User"));
        org.apache.axis.description.ElementDesc elemField = new org.apache.axis.description.ElementDesc();
        elemField.setFieldName("userName");
        elemField.setXmlName(new javax.xml.namespace.QName("", "userName"));
        elemField.setXmlType(new javax.xml.namespace.QName("http://www.w3.org/2001/XMLSchema", "string"));
        elemField.setMinOccurs(0);
        elemField.setNillable(false);
        typeDesc.addFieldDesc(elemField);
        elemField = new org.apache.axis.description.ElementDesc();
        elemField.setFieldName("partnerId");
        elemField.setXmlName(new javax.xml.namespace.QName("", "partnerId"));
        elemField.setXmlType(new javax.xml.namespace.QName("http://www.w3.org/2001/XMLSchema", "string"));
        elemField.setMinOccurs(0);
        elemField.setNillable(false);
        typeDesc.addFieldDesc(elemField);
        elemField = new org.apache.axis.description.ElementDesc();
        elemField.setFieldName("serviceNo");
        elemField.setXmlName(new javax.xml.namespace.QName("", "serviceNo"));
        elemField.setXmlType(new javax.xml.namespace.QName("http://www.w3.org/2001/XMLSchema", "string"));
        elemField.setMinOccurs(0);
        elemField.setNillable(false);
        typeDesc.addFieldDesc(elemField);
        elemField = new org.apache.axis.description.ElementDesc();
        elemField.setFieldName("date");
        elemField.setXmlName(new javax.xml.namespace.QName("", "date"));
        elemField.setXmlType(new javax.xml.namespace.QName("http://www.w3.org/2001/XMLSchema", "string"));
        elemField.setMinOccurs(0);
        elemField.setNillable(false);
        typeDesc.addFieldDesc(elemField);
          }

    /**
     * Return type metadata object
     */
    public static org.apache.axis.description.TypeDesc getTypeDesc() {
        return typeDesc;
    }

    /**
     * Get Custom Serializer
     */
    public static org.apache.axis.encoding.Serializer getSerializer(
           java.lang.String mechType, 
           java.lang.Class _javaType,  
           javax.xml.namespace.QName _xmlType) {
        return 
          new  org.apache.axis.encoding.ser.BeanSerializer(
            _javaType, _xmlType, typeDesc);
    }

    /**
     * Get Custom Deserializer
     */
    public static org.apache.axis.encoding.Deserializer getDeserializer(
           java.lang.String mechType, 
           java.lang.Class _javaType,  
           javax.xml.namespace.QName _xmlType) {
        return 
          new  org.apache.axis.encoding.ser.BeanDeserializer(
            _javaType, _xmlType, typeDesc);
    }

I think you should use Serializable and Deserializable to send  and recieve Xml to Object and Object to Xml for example you can using hashTable to
put your environment in it
for example in java  5 and EJB3.0 :

           Hashtable environment = new Hashtable(); 
           environment.put(Context.INITIAL_CONTEXT_FACTORY, "org.jnp.interfaces.NamingContextFactory"); 
            environment.put(Context.URL_PKG_PREFIXES, "jboss.naming:org.jnp.interfaces"); 
            environment.put(Context.PROVIDER_URL, "jnp://localhost:1099"); // remote machine IP 

         try { 
                InitialContext context = new InitialContext(environment); 
                RemoteAgentFacade rbi = (RemoteAgentFacade) context.lookup(RemoteAgentFacade.class.getName());
if(rbi.canLogin("Hatami")) {
System.out.println("Ok");
}