java - Spring mvc 抛出 org.springframework.web.HttpMediaTypeNotAcceptableException : Could not find acceptable representation

Question

我正在使用 springMVC 并且在尝试进行更新时出现以下异常。

10:10:49,847 DEBUG LogicalConnectionImpl:250 - Released JDBC connection
10:10:49,859 DEBUG FixedContentNegotiationStrategy:48 - Requested media types is text/html (based on     default MediaType)
10:10:49,929 DEBUG ExceptionHandlerExceptionResolver:132 - Resolving exception from handler [public   com.model.JobQueue com.controller.TestResultController.updateJob(java.lang.String,java.lang.String,java.lang.String)]: org.springframework.web.HttpMediaTypeNotAcceptableException: Could not find acceptable representation
10:10:49,937 DEBUG ResponseStatusExceptionResolver:132 - Resolving exception from handler [public com.model.JobQueue com.controller.TestResultController.updateJob(java.lang.String,java.lang.String,java.lang.String)]: org.springframework.web.HttpMediaTypeNotAcceptableException: Could not find acceptable representation
10:10:49,938 DEBUG DefaultHandlerExceptionResolver:132 - Resolving exception from handler [public com.model.JobQueue com.controller.TestResultController.updateJob(java.lang.String,java.lang.String,java.lang.String)]: org.springframework.web.HttpMediaTypeNotAcceptableException: Could not find acceptable representation
10:10:49,940 DEBUG DispatcherServlet:999 - Null ModelAndView returned to DispatcherServlet with name 'dispatcher': assuming HandlerAdapter completed request handling
10:10:49,940 DEBUG DispatcherServlet:966 - Successfully completed request
10:10:49,941 DEBUG DefaultListableBeanFactory:246 - Returning cached instance of singleton bean 'org.springframework.context.annotation.internalScheduledAnnotationProcessor'

下面是抛出异常的 Controller 方法。我需要做些什么才能完成这项工作吗？

@RequestMapping(value="/updateJob", method=RequestMethod.GET)
public @ResponseBody JobQueue updateJob(@RequestParam(value="job_id") String job_id, @RequestParam String test_id, @RequestParam(value="status") String status) {
   JobQueue job = jobqueueService.getJob(Integer.parseInt(job_id));
   job.setTest_id(test_id);
   job.setStatus(Integer.parseInt(status));
   jobqueueService.updateJob(job);
   return job;
}

我找到了以下帖子 Spring MVC - HttpMediaTypeNotAcceptableException讨论了类似的问题，但我不确定如何使用注释解决这个问题。

有什么想法吗？

Answer 1

异常是因为controller的返回值而抛出的。一旦我更改了返回值，异常就消失了。

public @ResponseBody String updateJob(@RequestParam(value="job_id") String job_id){

我还将响应更改为空。

@RequestMapping(value="/updateJob", method=RequestMethod.GET)
public @ResponseBody String updateJob(@RequestParam(value="job_id") String job_id){
    Integer jobid = Integer.parseInt(job_id);

    JobQueue job = jobqueueService.getJob(jobid);
    .
    .
    return null;
}