400 Bad Request for missing URI template variable is incorrect [SPR-13121]

[spring-projects-issues]

Yi EungJun opened SPR-13121 and commented

If I have a controller which has a method whose RequestMapping is incorrect as follows:

@RestController
public class HelloController {
    @RequestMapping("/test/{a}")
    public String test(@PathVariable String b) {
        return "ok";
    }
}

Then I request '/test/1' the server will response with 400 Bad Request as follows:

{"timestamp":1434182424954,"status":400,"error":"Bad Request","exception":"org.springframework.web.bind.ServletRequestBindingException","message":"Missing URI template variable 'b' for method parameter of type String","path":"/test/aaa"}

But 400 Bad Request is incorrect for this situation because it was not a client error but a server error, because there is no way to request correctly without modifying the server.

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Affects: 4.1.6

Issue Links:

• Specific exceptions for missing request headers, cookies, etc [SPR-14818] #19384 Specific exceptions for missing request headers, cookies, etc
• InvocableHandlerMethod.getMethodArgumentValues() failure should lead to warn-level logging by default [SPR-13267] #17858 InvocableHandlerMethod.getMethodArgumentValues() failure should lead to warn-level logging by default

Referenced from: commits 4b05bda