Spring DI - Autowired property is null in a REST service

Question

I\'m getting started with Spring DI, but I\'m struggling with dependency injection and the worse part is that I\'m not even sure why as it seems ok to me. Hopefully you guys

Answer 1

Integration Spring with Jersey 2 (org.glassfish.*):

Maven

Some dependencies may be unnecessary, please check & clear it after things got working.

    
        2.5
    

    
    
        org.glassfish.jersey.core
        jersey-server
        ${jersey.version}
    

    
        org.glassfish.jersey.containers
        
        jersey-container-servlet
        ${jersey.version}
    
    
        org.glassfish.jersey.core
        jersey-client
        ${jersey.version}
    
    
        org.glassfish.jersey.test-framework.providers
        jersey-test-framework-provider-inmemory
        ${jersey.version}
    

    
    
        org.glassfish.jersey.ext
        jersey-spring3
        ${jersey.version}
        
            
                org.springframework
                spring
            
            
                org.springframework
                spring-core
            
            
                org.springframework
                spring-web
            
            
                org.springframework
                spring-beans
            
            
                org.springframework
                spring-context
            
        
    

web.xml

    my-rest-service
    org.glassfish.jersey.servlet.ServletContainer
    
        jersey.config.server.provider.packages
        my.package.with.rest.services
    
    1



    my-rest-service
    /api/*

applicationContext.xml

During the Spring upgrading I had to move it from /main/webapp/WEB-INF/ to /main/resources/ (details).

Example REST service

public interface MyService
{
    String work(String s);
}

...

@Service
public class MyServiceImpl implements MyService
{
    @Override
    public String work(String s)
    {
        return "Hello, " + s;
    }
}

...

@Path("demo/")
@Component
public class DemoRestService
{
    @Autowired
    private MyService service;

    @GET
    @Path("test")
    public Response test(@FormParam("param") String par)
    {
        try
        {
            String entity = service.work(par);
            return Response.ok(entity).build();
        }
        catch (Exception e)
        {
            e.printStackTrace();
            return Response.status(Status.INTERNAL_SERVER_ERROR).entity("Epic REST Failure").build();
        }
    }
}