Two classes have the same XML type name?

When I'm generating the SEI stub object from a WSDL using following command:

   <plugin>
       <groupId>org.codehaus.mojo</groupId>
       <artifactId>jaxws-maven-plugin</artifactId>
       <executions>
         <execution>
           <goals>
             <goal>wsimport</goal>
           </goals>
             <configuration>
             <wsdlUrls>
               <wsdlUrl>http://localhost:8080/ws2?wsdl</wsdlUrl>
             </wsdlUrls>
           <keep>true</keep>
           <packageName>org.huahsin.jaxws.staff</packageName>
           <sourceDestDir>${basedir}/src</sourceDestDir>             
         </configuration>
         </execution>
       </executions>
   </plugin>

I'm not happy with the package name, so I decide to give a better name by changing the package name in a manual way. But when the client program trying to access the service:

 URL url = new URL("http://localhost:8080/ws2/SeniorManager?wsdl");
 QName qname = new QName("http://staff.huahsin.org/", "SeniorManagerService");
 SeniorManagerService service = new SeniorManagerService(url, qname);
 ISeniorManager manager = service.getSeniorManagerPort();
 System.out.println(manager.getID());

I hit this error:

Exception in thread "main" javax.xml.ws.WebServiceException: Unable to create JAXBContext
 at com.sun.xml.internal.ws.model.AbstractSEIModelImpl.createJAXBContext(AbstractSEIModelImpl.java:156)
 at com.sun.xml.internal.ws.model.AbstractSEIModelImpl.postProcess(AbstractSEIModelImpl.java:84)
 at com.sun.xml.internal.ws.model.RuntimeModeler.buildRuntimeModel(RuntimeModeler.java:234)
 at com.sun.xml.internal.ws.client.WSServiceDelegate.createSEIPortInfo(WSServiceDelegate.java:673)
 at com.sun.xml.internal.ws.client.WSServiceDelegate.addSEI(WSServiceDelegate.java:661)
 at com.sun.xml.internal.ws.client.WSServiceDelegate.getPort(WSServiceDelegate.java:330)
 at com.sun.xml.internal.ws.client.WSServiceDelegate.getPort(WSServiceDelegate.java:313)
 at com.sun.xml.internal.ws.client.WSServiceDelegate.getPort(WSServiceDelegate.java:295)
 at javax.xml.ws.Service.getPort(Service.java:119)
 at org.huahsin.jaxws.SeniorManagerService.getSeniorManagerPort(SeniorManagerService.java:72)
 at org.huahsin.Client.main(Client.java:23)
Caused by: java.security.PrivilegedActionException: com.sun.xml.internal.bind.v2.runtime.IllegalAnnotationsException: 2 counts of IllegalAnnotationExceptions
Two classes have the same XML type name "{http://staff.huahsin.org/}getID". Use @XmlType.name and @XmlType.namespace to assign different names to them.
 this problem is related to the following location:
  at org.huahsin.jaxws.GetID
  at public javax.xml.bind.JAXBElement org.huahsin.jaxws.ObjectFactory.createGetID(org.huahsin.jaxws.GetID)
  at org.huahsin.jaxws.ObjectFactory
 this problem is related to the following location:
  at org.huahsin.jaxws.staff.GetID
Two classes have the same XML type name "{http://staff.huahsin.org/}getIDResponse". Use @XmlType.name and @XmlType.namespace to assign different names to them.
 this problem is related to the following location:
  at org.huahsin.jaxws.GetIDResponse
  at public javax.xml.bind.JAXBElement org.huahsin.jaxws.ObjectFactory.createGetIDResponse(org.huahsin.jaxws.GetIDResponse)
  at org.huahsin.jaxws.ObjectFactory
 this problem is related to the following location:
  at org.huahsin.jaxws.staff.GetIDResponse

 at java.security.AccessController.doPrivileged(Native Method)
 at com.sun.xml.internal.ws.model.AbstractSEIModelImpl.createJAXBContext(AbstractSEIModelImpl.java:143)
 ... 10 more
Caused by: com.sun.xml.internal.bind.v2.runtime.IllegalAnnotationsException: 2 counts of IllegalAnnotationExceptions
Two classes have the same XML type name "{http://staff.huahsin.org/}getID". Use @XmlType.name and @XmlType.namespace to assign different names to them.
 this problem is related to the following location:
  at org.huahsin.jaxws.GetID
  at public javax.xml.bind.JAXBElement org.huahsin.jaxws.ObjectFactory.createGetID(org.huahsin.jaxws.GetID)
  at org.huahsin.jaxws.ObjectFactory
 this problem is related to the following location:
  at org.huahsin.jaxws.staff.GetID
Two classes have the same XML type name "{http://staff.huahsin.org/}getIDResponse". Use @XmlType.name and @XmlType.namespace to assign different names to them.
 this problem is related to the following location:
  at org.huahsin.jaxws.GetIDResponse
  at public javax.xml.bind.JAXBElement org.huahsin.jaxws.ObjectFactory.createGetIDResponse(org.huahsin.jaxws.GetIDResponse)
  at org.huahsin.jaxws.ObjectFactory
 this problem is related to the following location:
  at org.huahsin.jaxws.staff.GetIDResponse

 at com.sun.xml.internal.bind.v2.runtime.IllegalAnnotationsException$Builder.check(IllegalAnnotationsException.java:91)
 at com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl.getTypeInfoSet(JAXBContextImpl.java:442)
 at com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl.<init>(JAXBContextImpl.java:274)
 at com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl.<init>(JAXBContextImpl.java:125)
 at com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl$JAXBContextBuilder.build(JAXBContextImpl.java:1127)
 at com.sun.xml.internal.bind.v2.ContextFactory.createContext(ContextFactory.java:173)
 at com.sun.xml.internal.bind.api.JAXBRIContext.newInstance(JAXBRIContext.java:95)
 at com.sun.xml.internal.ws.developer.JAXBContextFactory$1.createJAXBContext(JAXBContextFactory.java:98)
 at com.sun.xml.internal.ws.model.AbstractSEIModelImpl$1.run(AbstractSEIModelImpl.java:151)
 at com.sun.xml.internal.ws.model.AbstractSEIModelImpl$1.run(AbstractSEIModelImpl.java:143)
 ... 12 more

At first, this was really clueless to me. Spending day and night searching whatever clue appears on the stacktrace. And eventually I found nothing. Until in the late night only I found the out root cause. Never change the stub object's package name by hand, if the it does make some noise on you, delete the whole thing and regenerate again.

Like it or not, this is the way.