在axis2 升级过程中遇到 The ServiceClass object does not implement the required method in the following form: OMElement sayHelloNew(OMElement e)错误,原因是高版本需要对方法定义,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>