How to inject ObjectMapper in spring

I have a batch job written using Spring Batch

I have a config file below:

@Configuration
public class ObjectMapperConfig {

        @Bean
        public ObjectMapper objectMapper(){
            return new ObjectMapper();
        }
    }

I have Json Line aggregator as below:

public class JsonLineAggregator<T> implements LineAggregator<T> {

    private final ObjectMapper mapper = new ObjectMapper();

    @Override
    public String aggregate(final T item) {
        String result = null;
        try {
            result = mapper.writeValueAsString(item);
        } catch (JsonProcessingException e) {
            e.printStackTrace();
        }
        return result;
    }

}

I want to inject objectMapper and don’t want to create it inside the JsonLineAggregator class. Any idea how can I implement it using DI ?

Answer

You can use @Autowired annotation to inject the dependency in spring like this:

@Autowired
private final ObjectMapper mapper;

And Spring will inject the ObjectMapper bean created by you in ObjectMapperConfig class