import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
@RequestMapping
public class DemoController {

    DemoController(){
        System.out.println("Controller init...");
    }
    
    @Autowired
    private EmployeeService employeeService;

    @RequestMapping("/demo")
    public String demo(){
        System.out.println("Preparing HTTP request...");
        return "This is from demo";
    }
}

EmployeeService.Java

import org.springframework.stereotype.Service;

@Service
public class EmployeeService {

    public EmployeeService(){
        System.out.println("Service Init ...");
    }

}

Controller init...
Service Init ...
Preparing HTTP request...

@SpringBootApplication
public class SpringBootConfig {
    public static void main(String[] args) throws Exception {
        SpringApplication application = new SpringApplication(SpringBootConfig.class);
        application.setLazyInitialization(true);
        application.run();
    }
}

@Service
@Lazy(value = false)                // disable lazy for this bean
public class EmployeeService {

    public EmployeeService(){
        System.out.println("Service Init ...");
    }

}