I am getting NullPointerException from spring service

Question

I am trying to build a basic webpage with Spring + JSF. Basically, I have one HelloController and HelloSpringService. It gives error on the return helloSpringService.sayHello(); line in HelloController class.

public class HelloController {


    @ManagedProperty("#{helloSpringService)")
    private HelloSpringService helloSpringService;

    public String showHello() {

        return helloSpringService.sayHello();
    }

    public void setHelloSpringService(HelloSpringService helloSpringService) {
        this.helloSpringService = helloSpringService;
    }
    public HelloSpringService getHelloSpringService() {
        return helloSpringService;
    }

}

import org.springframework.stereotype.Service;

@Service
public class HelloSpringService {

    public String sayHello() {
        return "hellofromspringservice";
    }
}

Answer 1

Use @Autowired instead of @ManagedProperty("#{helloSpringService)")

Answer 2

You have created the bean HelloSpringService as a service bean so Spring core is responsible for the life cycle of the bean so you must call it with @Autowired instead of @ManagedProperty.

Answer 3

helloSpringService

should be autowired rather than included as managedproperty