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";
    }
}

Please check the answer in the SO post that I commented above. — Madhu Bhat, Mar 26 '19 at 14:00

score 0 · Answer 1 · answered Mar 26 '19 at 14:00

0

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

answered Mar 26 '19 at 14:00

Ali Ben Zarrouk

1,891
16
24

1

Not fully right...See the duplicate... – Kukeltje Mar 26 '19 at 18:47

score 0 · Answer 2 · answered Mar 26 '19 at 14:04

0

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.

answered Mar 26 '19 at 14:04

Ismail

2,322
1
12
26

Not fully right...See the duplicate... – Kukeltje Mar 26 '19 at 18:47

score -1 · Answer 3 · answered Mar 26 '19 at 16:44

-1

helloSpringService

should be autowired rather than included as managedproperty

answered Mar 26 '19 at 16:44

Amit

391
4
9

How does this differ (and is significantly better) than the other answers? – Kukeltje Mar 26 '19 at 17:26
This comment was added almost the same time the other ones were added, when i posted this, I did't see the other comments. Could be due to the fact that i was on the page for a longer time, and didn't reload the page before publishing my comment – Amit Apr 02 '19 at 16:04

I am getting NullPointerException from spring service

3 Answers3