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I'm building web service using JAX-WS. I have a strange problem that the annotation @XmlElement(required=true) for @WebParam works in some @WebService class, but doesn't work in some others. I have very similar code in the two @WebService classes. What may cause this problem? Parameter type or the entity class? Edit: Add sample code I have two web services: @WebService(name = "ClubMemberPortType", serviceName = "ClubMemberService", portName = "ClubMemberSoapPort", targetNamespace = "http://club.com/api/ws") public class ClubMemberWS { @WebMethod(operationName = "findClubMembersByClubId", action = "urn:findClubMembersByClubId") @WebResult(name = "club_membership") public List<ClubMembership> findClubMembershipsByClubId(@XmlElement(required=true) @WebParam(name = "club_id") String clubId, @WebParam(name = "status") StatusEnum status){ ... }} and @WebService(name = "ClubPortType", serviceName = "ClubService", portName = "ClubSoapPort", targetNamespace = "http://club.com/api/ws") public class ClubWS { @WebMethod(operationName = "findClubByClubId", action = "urn:findClubByClubId") @WebResult(name = "club") public Club findClubByClubId(@XmlElement(required=true) @WebParam(name = "club_id") String clubId) { ... }} The generated schema for the first web method is: <soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:ws="http://club.com/api/ws"> <soapenv:Header/> <soapenv:Body> <ws:findClubMembersByClubId> <club_id>?</club_id>  <status>?</status> </ws:findClubMembersByClubId> </soa

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