WebLogic Web Service: A jws BLA should have a package declaration

Caused by: weblogic.wsee.ws.WsException: A jws [class PVWSImpl01] should have a package declaration.
        at weblogic.wsee.deploy.DeployInfo.validate(DeployInfo.java:356)
        at weblogic.wsee.jaxws.JAXWSDeployedServlet.init(JAXWSDeployedServlet.java:87)
        at javax.servlet.GenericServlet.init(GenericServlet.java:244)
        at weblogic.servlet.internal.StubSecurityHelper$ServletInitAction.run(StubSecurityHelper.java:343)
        at weblogic.servlet.internal.StubSecurityHelper$ServletInitAction.run(StubSecurityHelper.java:294)
        at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:326)
        at weblogic.security.service.SecurityManager.runAsForUserCode(SecurityManager.java:196)
        at weblogic.servlet.provider.WlsSecurityProvider.runAsForUserCode(WlsSecurityProvider.java:203)
        at weblogic.servlet.provider.WlsSubjectHandle.run(WlsSubjectHandle.java:71)
        at weblogic.servlet.internal.StubSecurityHelper.initServletInstance(StubSecurityHelper.java:99)
        at weblogic.servlet.internal.StubSecurityHelper.createServlet(StubSecurityHelper.java:87)
        at weblogic.servlet.internal.StubLifecycleHelper.createOneInstance(StubLifecycleHelper.java:71)
        at weblogic.servlet.internal.StubLifecycleHelper.(StubLifecycleHelper.java:57)
        at weblogic.servlet.internal.StubLifecycleHelper.(StubLifecycleHelper.java:31)
        at weblogic.servlet.internal.ServletStubImpl.initStubLifecycleHelper(ServletStubImpl.java:673)
        at weblogic.servlet.internal.ServletStubImpl.prepareServlet(ServletStubImpl.java:612)
        at weblogic.servlet.internal.WebAppServletContext.preloadServlet(WebAppServletContext.java:2053)
        at weblogic.servlet.internal.WebAppServletContext.loadServletsOnStartup(WebAppServletContext.java:2030)
        at weblogic.servlet.internal.WebAppServletContext.preloadResources(WebAppServletContext.java:1919)
        at weblogic.servlet.internal.WebAppServletContext.start(WebAppServletContext.java:3063)
        at weblogic.servlet.internal.WebAppModule.startContexts(WebAppModule.java:1830)
        at weblogic.servlet.internal.WebAppModule.start(WebAppModule.java:875)
        at weblogic.application.internal.ExtensibleModuleWrapper$StartStateChange.next(ExtensibleModuleWrapper.java:360)
        at weblogic.application.internal.ExtensibleModuleWrapper$StartStateChange.next(ExtensibleModuleWrapper.java:356)
        at weblogic.application.utils.StateMachineDriver.nextState(StateMachineDriver.java:45)
        at weblogic.application.internal.ExtensibleModuleWrapper.start(ExtensibleModuleWrapper.java:138)

as the error message says, it's compulsory to assign a package (package com.bla.ws;) to your interface and implementation for your WebService and SEI.

package com.pierre.ws;

import javax.jws.*;

@WebService(portName = "PVWLSWS01Port", serviceName = "PVWLSWS01Service", targetNamespace = "http://com.pierre.ws/", endpointInterface = "com.pierre.ws.PVWLSWS01")
public class PVWLSWS01Impl implements PVWLSWS01 {

 public String hello(String name) {
  System.out.println("Hello " + name);
  return "Hello " + name;

 }
}

package com.pierre.ws;

import javax.jws.WebMethod;
import javax.jws.WebService;

@WebService(name = "PVWLSWS01", targetNamespace = "http://com.pierre.ws/")
public interface PVWLSWS01 {

 @WebMethod(operationName = "hello")
 public String hello(String name);
}