java - Spring boot : How to make ContentType header purely optional? It throws a HttpMediaTypeNotSupportedException if not passed

Question

I want my application to work even when ContentType header is not passed. The request body in my case is always a JSON. But the below code always throws an exception

org.springframework.web.HttpMediaTypeNotSupportedException: Content type 'application/x-www-form-urlencoded;charset=UTF-8' not supported

public class UserController {
    @PostMapping(value = "/updateUser", produces = MediaType.APPLICATION_JSON_VALUE)
    public ResponseEntity<?> updateUserDetails(@RequestBody User user) {
        //Do something
    }

This was expected, but even after creating a custom config, it gives the same error:

@Configuration
public class MyWebConfig implements WebMvcConfigurer {

    @Override
    public void configureContentNegotiation(ContentNegotiationConfigurer configurer) {
        configurer.defaultContentType(MediaType.APPLICATION_JSON);
    }
}

This works fine if I pass the ContentType header which i want to make purely optional. Please help.

Answer 1

The problem may occur because the User object cannot have any getters / setters