java Spring启动项目创建bean时出错

Question

我有以下代码：

package com.frameworkonly.webapp;

import java.util.ArrayList;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.boot.autoconfigure.web.ErrorMvcAutoConfiguration;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;

import com.frameworkonly.webapp.domain.Employee;
import com.frameworkonly.webapp.service.EmployeeServiceInterface;

@EnableAutoConfiguration(exclude = {ErrorMvcAutoConfiguration.class})
@ComponentScan("com.frameworkonly.webapp")
public class SpringBootDemoApplication {

    @Autowired
    EmployeeServiceInterface employeeServiceInterface;

    public static void main(String[] args) {
        SpringApplication.run(SpringBootDemoApplication.class, args);
    }
}

我刚从Spring Boot开始。它给了我以下信息，我不知道这意味着什么：

Error creating bean with name 'springBootDemoApplication': Injection of 
autowired dependencies failed; nested exception is 
org.springframework.beans.factory.BeanCreationException: Could not autowire 
field: com.exemple.service.PatientServiceInterface 
com.example.SpringBootDemoApplication.patientServiceInterface; nested 
exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: 
No qualifying bean of type [com.exemple.service.PatientServiceInterface] 
found for dependency: expected at least 1 bean which qualifies as autowire 
candidate for this dependency. 

Answer 1

将com.exemple.service添加到扫描包列表中，假设PatientServiceInterface用@Service注释

@ComponentScan({"com.frameworkonly.webapp","com.exemple.service"})