我有一個非常簡單的服務,返回一個500錯誤 - 這裏是在錯誤的詳細信息:JAX RS 500錯誤
[EL信息]:2013年11月1日11:09:05.61 - 的ServerSession( EclipseLink,版本:Eclipse持久性服務 - 2.3.2.v20111125-r10461
[EL Info]:2013-11-01 11:09:06.452 - ServerSession(741529784) - file:/ C :/Users/Fred/workspace/.metadata/.plugins/org.eclipse.wst.server.core/tmp0/wtpwebapps/cheese-ws/WEB-INF/lib/cheese-jpa.jar_cheese登錄成功
34442 [http-bio-8080-exec-1] ERROR org.apache.wink.server.internal.handlers.Flus hResultHandler - 系統無法爲java.util.Vector類型和application/json mediaType找到javax.ws.rs.ext.MessageBodyWriter或DataSourceProvider類。確保JAX-RS應用程序中存在指定類型和媒體類型的javax.ws.rs.ext.MessageBodyWriter。
34446 [http-bio-8080-exec-1] INFO org.apache.wink.server.internal.RequestProcessor - 調用處理程序鏈期間發生以下錯誤:WebApplicationException(500 - Internal Server Error)with消息「空」,而發送到處理GET請求......
的代碼非常簡單,非常相似,做工精細等服務:
公共類StudentTeacherCommunicationService擴展BaseService {
@GET
@Path("classroomId/{classroomId}/studentId/{studentId}")
@Produces(MediaType.APPLICATION_JSON)
public List<ClassroomStudentCommunication> getCandidatesAsJson(@PathParam("classroomId") int classroomId, @PathParam("studentId") int studentId) {
EntityManager em = createEM();
TypedQuery<ClassroomStudentCommunication> query;
if(studentId==0) {
query = em.createQuery("SELECT csc FROM ClassroomStudentCommunication csc where csc.classroomId = :classroomId ORDER BY csc.threadOrder", ClassroomStudentCommunication.class);
query.setParameter("classroomId", classroomId);
List <ClassroomStudentCommunication> classCommunication = query.getResultList();
return classCommunication;
任何想法?
你使用Maven?如果是,請告訴我們pom.xml。 –