because of dubbo2.5.3 webservice RPC is very old dev@2013?，so it replied on cxf2.6.1，but cxf 2.6.1 integriting with dubbo using spring 4.0，is not compatible， when the spring container starting, it raise NoSuchMethod at some spring aop framwork classes。i judge it means cxf2 & spring4 is not compatible。
when cxf upgrade to 3.x above，the dubbo error： NoSuchMethod at some cxf related class，it means cxf3 & dubbo rpc webservice is not compatible, WebServiceProtocol.java

--
refer to https://github.com/apache/incubator-dubbo/blob/master/dubbo-rpc/dubbo-rpc-webservice/src/main/java/com/alibaba/dubbo/rpc/protocol/webservice/WebServiceProtocol.java
error happends @ line 88

so I ask here any plan to upgrade to support cxf3?