How to inject dependency into Jackson Custom deserializer

Question

I want to enable a custom jackson deserializer of some fields of type String. The deserializer also needs to be injected with a guice based dependency bean. SampleCode below

Answer 1

I haven't used Guice that much, but I guess it is somewhat similar to Spring. So I will post this answer here in case you can use the same principles as I have, and that someone using Spring reads this.

First I annotate my Jackson module as a Spring @Component:

@Component
public class FlowModule extends SimpleModule {

@Autowired private SupplierItemDeserializer supplierItemDeserializer;

This means I can get whatever I want @Autowired into my module. As you can see I have also done the same thing to my de- / serializers:

@Component
public class SupplierItemDeserializer extends JsonDeserializer {

@Autowired
private SupplierService supplierService;

I have then created a service that deals with converting to and from JSON:

@Service
public class IOService {

private ObjectMapper mapper;

@Autowired
private FlowModule flowModule;


@PostConstruct
public void initialize() {
    mapper = new ObjectMapper();
    mapper.registerModule(flowModule);
    mapper.registerModule(new JavaTimeModule());
}

The service contains an ObjectMapper with my module that has all the right wiring.