Axis2 服务器端抛出ServiceClass object does not implement问题解决方法

The ServiceClass object does not implement the required method
in the following form: OMElement xxx (OMElement e)

解决的方法是在service.xml里面对服务器端开放的服务（操作方法）进行说明。比如我的服务端实现了这两个方法add和hello，那么就需要这么定义一下：

<operation name="hello" >
        <messageReceiver  mep="http://www.w3.org/2004/08/wsdl/in-out" class="org.apache.axis2.rpc.receivers.RPCMessageReceiver" />
    </operation>
    <operation name="add" >
        <messageReceiver  mep="http://www.w3.org/2004/08/wsdl/in-out" class="org.apache.axis2.rpc.receivers.RPCMessageReceiver" />
    </operation>