org.springframework.web.HttpMediaTypeNotAcceptableException:

From：http://cmzx3444.iteye.com/blog/930732

js代码：Java代码

1. function?ajaxLogin()?{??
2. ????$.ajax({type:"post",?url:"ajaxLogin.do",?data:"username=acid&password=acid",?success:function?(account)?{??
3. ????????alert("Data?Saved:?"?+?account.username);??
4. ????}});??
5. }??

Controller中的方法：Java代码

1. @RequestMapping(value?=?"/ajaxLogin.do",?method?=?RequestMethod.POST)??
2. public?@ResponseBody??
3. Account?ajaxLogin(HttpServletRequest?request,?@Valid??
4. Account?account,?BindingResult?result)??
5. {??
6. ????account?=?accountService.getAccount(account.getUsername(),?account.getPassword());??
7. ????if?(account?==?null)??
8. ????{??
9. ????????return?null;??
10. ????}??
11. ????Utils.setToSession(SessionKey.USER_ID,?account.getUsername());??
12. ????return?account;??
13. }??

结果出现了这个异常：Java代码

1. org.springframework.web.HttpMediaTypeNotAcceptableException:?Could?not?find?acceptable?representation??
2. ????at?org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter$ServletHandlerMethodInvoker.writeWithMessageConverters(AnnotationMethodHandlerAdapter.java:993)??
3. ????at?org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter$ServletHandlerMethodInvoker.handleResponseBody(AnnotationMethodHandlerAdapter.java:933)??
4. ????at?org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter$ServletHandlerMethodInvoker.getModelAndView(AnnotationMethodHandlerAdapter.java:882)??
5. ????at?org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.invokeHandlerMethod(AnnotationMethodHandlerAdapter.java:428)??
6. ????at?org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.handle(AnnotationMethodHandlerAdapter.java:414)??
7. ????at?org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:790)??
8. ????at?org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:719)??
9. ????at?org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:644)??
10. ????at?org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:549)??
11. ????at?javax.servlet.http.HttpServlet.service(HttpServlet.java:617)??
12. ????at?javax.servlet.http.HttpServlet.service(HttpServlet.java:717)??
13. ????at?org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)??
14. ????at?org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)??
15. ????at?com.shop.core.context.ContextInitFilter.doFilter(ContextInitFilter.java:33)??
16. ????at?org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)??
17. ????at?org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)??
18. ????at?org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)??
19. ????at?org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)??
20. ????at?org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)??
21. ????at?org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)??
22. ????at?org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)??
23. ????at?org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)??
24. ????at?org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:857)??
25. ????at?org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)??
26. ????at?org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)??
27. ????at?java.lang.Thread.run(Thread.java:662)??

看了看官方的demo，好像用到了jackson这个包。加上这个包后一切正常！原因估计是序列化这个account对象的时候出了问题。因为我直接返回string对象不会出错。