Multi tool use

Spring boot 2.0 custom converter being ignored

I've either completely miss-understood converters, or all the examples/blogs/docs I've found are assuming I've done a step... My understanding is that when I post a String, the converter will pick it up and give the Controller a POJO instead.

String

Controller

The problem I have is the converter is never being called.

The payload coming into the controller is a standard JSON API string

{
"data":{
"attributes":{
"created-date":null,
},
"type":"steaks"
}
}


The converter:

@Slf4j
@Configuration
public class SteakConverter implements Converter<String, Steak> {

@Override
public Steak convert(String value) {
log.info("converter value {}", value);
return new Steak.builder().build();
}
}


The controller:

@Slf4j
@CrossOrigin
@RestController
public class SteakController {

@PostMapping("/steaks")
public ResponseEntity<String> create(@RequestBody Steak steak) {

}

}


From reading all the blogs and docs I can find this should be all that's needed. However I've also tried manually registering with the following:

@Slf4j
@EnableWebMvc
@Configuration
public class WebConfig implements WebMvcConfigurer {

@Override
public void addFormatters(FormatterRegistry registry) {
log.info("Converter registered");
registry.addConverter(new SteakConverter());
}

}


This is called during application startup.

The only thing I can think of is that the converter/controller doesn't think the payload is in fact a String, so is ignoring it?

How can I debug this, or just make it work?

Here is a working sample application that shows my problem.

Cheers

@Component

@Configuration

@EnableWebMvc

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