I am using JBossWS-CXF 3.2.1... I have a WSProvider based web service that works fine when operations using arguments are executed, but when a no-arg operation is executed it fails with the following: [PhaseInterceptorChain] Application has thrown exception, unwinding now org.apache.cxf.interceptor.Fault: wrong number of arguments while invoking public javax.xml.transform.Source org.soap.provider.Books_MySql_BOOKSProvider.invoke(javax.xml.transform.Source) with params null. Any ideas? Thanks, Ted