java - Value cannot injected into service class spring boot

Question

I already try to search through stackoverflow, and I don't think I find the solution I want...

Also I try to use answer https://stackoverflow.com/questions/45970442/spring-boot-value-returning-null and still doesn't work...

Here is my controller class

package com.vincent.springoauth.controller;
import com.vincent.springoauth.model.GiftCardRequest;
import com.vincent.springoauth.model.GiftCardResponse;
import com.vincent.springoauth.service.InCommGiftCardServiceImpl;
import org.springframework.web.bind.annotation.*;

@RestController
@RequestMapping("/api/gift-card")
public class GiftCardController{


    @PostMapping("/activate")
    public @ResponseBody
    GiftCardResponse activate(GiftCardRequest request) {
        GiftCardServiceImpl giftCardService = new GiftCardServiceImpl("");
        return giftCardService.activate(request);
    }
}

And here is my service class

package com.vincent.springoauth.service;

import com.vincent.springoauth.model.GiftCardRequest;
import com.vincent.springoauth.model.GiftCardResponse;
import lombok.extern.log4j.Log4j2;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Service;

@Service
@Log4j2
public class GiftCardServiceImpl {


    private final String baseEndpoint;

    public GiftCardServiceImpl( @Value("${webserviceurl}")String baseEndpoint){
        this.baseEndpoint = baseEndpoint;
    }



    public String accessToken() {
        log.info("Access oauth token url address: " + baseEndpoint);

        // will be use that base endpoint to manipulate stuff later
        return "abcdefg";

    }

    public GiftCardResponse activate(GiftCardRequest request) {

        log.info("Calling token ...");
        accessToken();
        log.info("Incomm Pre Auth Service");

        // Generate preAuth request;
        //RetailTransactionGenericRequestWrapper retailTransactionGenericRequest = buildRequest(request);
        //log.info("RetailTransactionGenericRequest: " + retailTransactionGenericRequest);
        GiftCardResponse response = GiftCardResponse.builder().responseCode("0").responseMessage("Success").build();
        return response;
    }
}

And in my application.properties I have following line webserviceurl=https://localhost/giftcard

The issue that in my service class the webserviceurl return null. How can I fix this?

Answer 1

In your controller you are creating your own instance of the service and so Spring is unaware of it and cannot inject the value. Your service class is annotated as a Service so Spring will create an instance, which will have the value injected but that is not the instance that your controller is using.

Instead you should declare that service as an instance variable in your controller and use either Autowire annotation on that instance variable or use constructor autowiring to ensure that the bean created by Spring is the one that is used by your controller.

@RestController
@RequestMapping("/api/gift-card")
public class GiftCardController{

    private GiftCardServiceImpl giftCardService;

    @Autowired
    public GiftCardController(GiftCardServiceImpl giftCardService) {
        this.giftCardService = giftCardService;
    }