CXF2.0.4 nor any of its super class is known to this context

org.apache.cxf.interceptor.Fault: Marshalling Error: class org.mumu.user.model.User nor any of its super class is known to this context.
at org.apache.cxf.jaxb.JAXBEncoderDecoder.marshall(JAXBEncoderDecoder.java:207)
at org.apache.cxf.jaxb.io.DataWriterImpl.write(DataWriterImpl.java:63)
at org.apache.cxf.interceptor.AbstractOutDatabindingInterceptor.writeParts(AbstractOutDatabindingInterceptor.java:84)
at org.apache.cxf.interceptor.BareOutInterceptor.handleMessage(BareOutInterceptor.java:68)
at org.apache.cxf.phase.PhaseInterceptorChain.doIntercept(PhaseInterceptorChain.java:208)
at org.apache.cxf.interceptor.OutgoingChainInterceptor.handleMessage(OutgoingChainInterceptor.java:74)
at org.apache.cxf.phase.PhaseInterceptorChain.doIntercept(PhaseInterceptorChain.java:208)
at org.apache.cxf.transport.ChainInitiationObserver.onMessage(ChainInitiationObserver.java:77)
at org.apache.cxf.transport.servlet.ServletDestination.doMessage(ServletDestination.java:79)
at org.apache.cxf.transport.servlet.ServletController.invokeDestination(ServletController.java:264)
at org.apache.cxf.transport.servlet.ServletController.invoke(ServletController.java:123)
at org.apache.cxf.transport.servlet.AbstractCXFServlet.invoke(AbstractCXFServlet.java:170)
at org.apache.cxf.transport.servlet.AbstractCXFServlet.doGet(AbstractCXFServlet.java:152)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:689)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869)
at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:664)
at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
at java.lang.Thread.run(Thread.java:619)
Caused by: javax.xml.bind.MarshalException
 - with linked exception:
[javax.xml.bind.JAXBException: class org.mumu.user.model.User nor any of its super class is known to this context.]
at com.sun.xml.bind.v2.runtime.MarshallerImpl.write(MarshallerImpl.java:295)
at com.sun.xml.bind.v2.runtime.MarshallerImpl.marshal(MarshallerImpl.java:221)
at javax.xml.bind.helpers.AbstractMarshallerImpl.marshal(AbstractMarshallerImpl.java:70)
at org.apache.cxf.jaxb.JAXBEncoderDecoder.writeObject(JAXBEncoderDecoder.java:360)
at org.apache.cxf.jaxb.JAXBEncoderDecoder.marshall(JAXBEncoderDecoder.java:182)User 是一个modeservice 实现是
public class IUserManagerImpl implements IUserManager { private static final Logger LOG = Logger.getLogger(IUserManagerImpl.class
.getName()); private IBaseDao baseDao; /*
 * (non-Javadoc)
 * 
 * @see org.mumu.user.service.IUserManager#getUserLists(*
 */ public java.util.List<java.lang.Object> getUserLists() {
LOG.info("Executing operation getUserLists");
try { String sql = "select * from t_user"; System.out.println(sql); List list = baseDao.getLists(sql, new UserRowMapper());
//如果改成 List list=new ArrayList();list.add("aaa");list.add("bbb");不会报错
                       System.out.println(list.size()); return list; } catch (Exception ex) {
ex.printStackTrace();
throw new RuntimeException(ex);
}
} public class UserRowMapper implements ParameterizedRowMapper<User> {
public User mapRow(ResultSet rs, int rowNum) throws SQLException {
User user = new User();
user.setLoginName(rs.getString("LOGIN_NAME"));
user.setUserID(rs.getLong("USER_ID"));
user.setUserEmail(rs.getString("USER_EMAIL"));
user.setUserDate(rs.getDate("USER_DATE"));
user.setUserName(rs.getString("USER_NAME"));
user.setUserPassword(rs.getString("USER_PASSWORD"));
user.setAuthoritiesFromString(rs.getString("USER_AUTHORITY")); return user;
}
} public void setBaseDao(IBaseDao baseDao) {
this.baseDao = baseDao;
}}