https://jira.spring.io/browse/SPR-12888
Description
When I use @RequestBody on one of my controllers for a required parameter, I need some useful way of saying which parameter was missing if it's not there. The exception message I see currently looks like this:
Required request body content is missing: org.springframework.web.method.HandlerMethod$HandlerMethodParameter@a8b8886e |
at org.springframework.test.util.MatcherAssertionErrors.assertThat(MatcherAssertionErrors.java:80) |
at org.springframework.test.util.JsonPathExpectationsHelper.assertValue(JsonPathExpectationsHelper.java:92) |
at org.springframework.test.web.servlet.result.JsonPathResultMatchers$1.match(JsonPathResultMatchers.java:56) |
at org.springframework.test.web.servlet.MockMvc$1.andExpect(MockMvc.java:152) |
... |
It would be nice if when that exception could have a reference to the parameter name that was missing, or if the message itself included it instead of the MethodParameter#toString(). I'll eventually want to internationalize the message I produce, so the parameter name is preferable.
Activity
The HttpMessageNotReadableException can be raised from many places where a method parameter does not apply so adding a new field to the exception isn't ideal. I considered sub-classing the exception but what I've done instead is to print the full method signature to improve the error message. Also we now support injecting the selected HandlerMethod into an @ExceptionHandler method so you can obtain the full information on the @RequestMapping method we were trying to call.
Resolving for now but feel free to comment further.