Better exception message for missing @RequestBody method parameter

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.

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Rossen Stoyanchev added a comment - 06/Apr/15 2:57 PM

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.

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Rossen Stoyanchev added a comment - 06/Apr/15 2:57 PM

Resolving for now but feel free to comment further.