object is not an instance of declaring class while invoking public abstract…的解决

如题所示，使用Apache CXF开发web service时，使用SoapUI对web service接口进行测试时报了以下错误：

org.apache.cxf.interceptor.Fault: object is not an instance of declaring class while invoking public abstract java.lang.String cn.zifangsky.service.CXFService.sayHello(java.lang.String) with params [dddd].
	at org.apache.cxf.service.invoker.AbstractInvoker.createFault(AbstractInvoker.java:166)
	at org.apache.cxf.jaxws.AbstractJAXWSMethodInvoker.createFault(AbstractJAXWSMethodInvoker.java:267)
	at org.apache.cxf.service.invoker.AbstractInvoker.invoke(AbstractInvoker.java:140)
	at org.apache.cxf.jaxws.AbstractJAXWSMethodInvoker.invoke(AbstractJAXWSMethodInvoker.java:232)
	at org.apache.cxf.jaxws.JAXWSMethodInvoker.invoke(JAXWSMethodInvoker.java:85)
...

<jaxws:server id="sayHelloServices" serviceClass="cn.zifangsky.service.CXFService" address="/services/soap" >
		<jaxws:serviceBean>
			<bean class="cn.zifangsky.service.impl.CXFServiceImpl" />
		</jaxws:serviceBean>
		<jaxws:outInterceptors>
			<ref bean="outLoggingInterceptor" />
		</jaxws:outInterceptors>
		<jaxws:inInterceptors>
			<ref bean="inLoggingInterceptor" />
		</jaxws:inInterceptors>
		<jaxws:features>
			<ref bean="loggingFeature" />
			<wsa:addressing xmlns:wsa="http://cxf.apache.org/ws/addressing" />
		</jaxws:features>
		
	</jaxws:server>

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