spring boot @Value的属性为null?报错

用的spring boot2 

@Component
public class ModeShapeSession {

    @Value("${modeshape}")
    String properties;


    public String run(){
        return properties;
    }
}

@RestController
@EnableAutoConfiguration
@RequestMapping("/oneScorpion/sdc/modeshape-Connections")
public class ModeshapeController {


    @Autowired
    ModeShapeSession modeShapeSession;

    //返回nflow.serviceName,nflow.title
    @RequestMapping("/select-nflow-name")
    public String modeshape_select(){
        return modeShapeSession.run()+"asasasa";
    }
}

程序启动的时候报错：

Field modeShapeSession in com.onescorpion.web.ModeshapeController required a bean of type 'com.onescorpion.connection.ModeShapeSession' that could not be found.

Action:

Consider defining a bean of type 'com.onescorpion.connection.ModeShapeSession' in your configuration.

百度里那些加@mapper ，@service ,加

@SpringBootApplication(scanBasePackages = "com.onescprpion.connection")

等着五花八门的都试过了，启动就是报错，初学者求指导