How to @autowire some bean into JsonSerializer?

Question

I am using lazy loading with hibernate in my web app.

I would like to load some objects from the database at the parsing stage of the server response

@Component public class DesignSerializer extends JsonSerializer<Design> { @Autowired IDesignService designService; <-- is null 

}

Which is totally understandable because DesignSerializer is being instantiated with the "new" operator for each object.

I am sure there is a way to inject my bean into that serializer when ever it is created, I just don't know how.

Can you guys help me or point me in the right direction.

Answer 1

Solution is SpringBeanAutowiringSupport if you are using Spring Framework 2.5+.

public class DesignSerializer extends JsonSerializer<Design> {      @Autowired         IDesignService designService;     }      public DesignSerializer(){         SpringBeanAutowiringSupport.processInjectionBasedOnCurrentContext(this);         }  ...  } 

I Hope that help you

Answer 2

We had the same problem with JsonSerializer and Spring autowiring. The solution that worked for us was to make two constructors. One for Spring which sets the dependency as a static field, and another one that is used by the Jackson initialisation.

This works because the Spring dependency injection (autowiring) happens before Jackson initialises the serializer.

@Component public class MyCustomSerializer extends JsonSerializer<String> {      private static IDesignService designService;      // Required by Jackson annotation to instantiate the serializer     public MyCustomSerializer() { }      @Autowired     public MyCustomSerializer(IDesignService designService) {         this.designService = designService;     }      @Override     public void serialize(String m, JsonGenerator gen, SerializerProvider s) {         gen.writeObject(MyCustomSerializer.designService.method(..));     } }