如何在Java中使用Google Cloud端点引发自定义异常？

Question

So I can see in the docs for Python you can just go:

raise endpoints.NotFoundException(message) 

( https://developers.google.com/appengine/docs/python/endpoints/exceptions )

so in Java I tried:

resp.sendError(HttpServletResponse.SC_BAD_REQUEST, "Event has no attendee!");

when I do this in Java I get:

{
 "error": {
  "errors": [
   {
    "domain": "global",
    "reason": "badRequest",
    "message": "com.google.appengine.repackaged.org.codehaus.jackson.map.JsonMappingException: Can not construct instance of javax.servlet.http.HttpServletResponse, problem: abstract types can only be instantiated with additional type information\n at [Source: N/A; line: -1, column: -1]"
   }
  ],
  "code": 400,
  "message": "com.google.appengine.repackaged.org.codehaus.jackson.map.JsonMappingException: Can not construct instance of javax.servlet.http.HttpServletResponse, problem: abstract types can only be instantiated with additional type information\n at [Source: N/A; line: -1, column: -1]"
 }
}

How do I do this properly? Thanks!

Answer 1

请参阅上面的评论，这非常适合我的需求。