Extending Jackson2JsonMessageConverter

[calvernaz]

I want to register a new module into the object mapper present in Jackson2JsonMessageConverter, but the documentation suggests two ways of doing it:

• One is to configure the ObjectMapper and inject into Jackson2JsonMessageConverter. The documentation in the setJsonObjectMapper suggest an alternative which is to extend the class and override the method initializeJsonObjectMapper

• The issue with extending the Jackson2JsonMessageConverter is the lack of access to the ObjectMapper in the parent class, ending up like this:

public class JacksonMessageConverter extends Jackson2JsonMessageConverter {
    @Override
    protected void initializeJsonObjectMapper() {
        ObjectMapper objectMapper = new ObjectMapper();
        objectMapper.registerModule(new GuavaModule());
        objectMapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
        this.setJsonObjectMapper(objectMapper);
    }
}

So we still have to inject the ObjectMapper, besides overriding the method, it doesn't really look like an alternative.

Changing the ObjectMapper visibility to protected (or a getter) would give us the alternative.

[garyrussell]

Yes, it looks like an oversight; there should either be a getter or the mapper should be passed in as an argument to the method.