The web service that I implemented is up and running, when I try to run the client I get the following error with regard to the classes that were generated using wsimport,

    Caused by: java.security.PrivilegedActionException: com.sun.xml.internal.bind.v2.runtime.IllegalAnnotationsException: 4 counts of IllegalAnnotationExceptions
Two classes have the same XML type name "{http://server.agency.hw2/}userJoined". Use @XmlType.name and @XmlType.namespace to assign different names to them.
    this problem is related to the following location:
        at hw2.chat.backend.main.generatedfromserver.UserJoined
        at public javax.xml.bind.JAXBElement hw2.chat.backend.main.generatedfromserver.ObjectFactory.createUserJoined(hw2.chat.backend.main.generatedfromserver.UserJoined)
        at hw2.chat.backend.main.generatedfromserver.ObjectFactory
    this problem is related to the following location:
        at ChatCompany.BackendChatServer.hw2.chat.backend.main.generatedfromserver.UserJoined
Two classes have the same XML type name "{http://server.agency.hw2/}userJoinedResponse". Use @XmlType.name and @XmlType.namespace to assign different names to them.
    this problem is related to the following location:
        at hw2.chat.backend.main.generatedfromserver.UserJoinedResponse
        at public javax.xml.bind.JAXBElement hw2.chat.backend.main.generatedfromserver.ObjectFactory.createUserJoinedResponse(hw2.chat.backend.main.generatedfromserver.UserJoinedResponse)

But I can't figure out what exactly is meant by the error. I am assuming I need to change something in annotations in this class as pointed out by the compiler:

@XmlAccessorType(XmlAccessType.FIELD)
@XmlType(name = "userJoinedResponse")
public class UserJoinedResponse {


}

could someone please point out why there's a name collision and what annotations I need to change?

thanks