Field baseMapper in xxxxx required a bean of type 'xxxxxx' that could not be found 问题

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#spring boot #通用mapper

在Spring Boot中整合通用Mapper时遇到bean找不到的问题，本文详细介绍了问题的解决思路，包括检查pom.xml中相关依赖，代码目录结构，确保BaseMapper与业务类Mapper不在同一目录，Service实现类为抽象类，业务类Mapper需添加@Mapper注解或使用@MapperScan，以及检查命名空间和接口名的对应关系，避免低级错误。希望对遇到同样问题的人有所帮助。

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最近在整合spring boot 和通用mapper时遇到错误，纠结了好长时间，先看错误

Description:Field baseMapper in com.sinosoft.common.mybatis.service.impl.BaseServiceImpl required a bean of type 'com.sinosoft.common.mybatis.mapper.MyBaseMapper' that could not be found.Action:Consider defining a bean of type 'com.sinosoft.common.mybatis.mapper.MyBaseMapper' in your configuration.Process finished with exit code 1

问题解决思路
1.先看下pom，下边是整合通用mapper所须的依赖

 <!--mysql-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>

        <!--mybatis-->
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>1.3.0</version>
        </dependency>

        <!-- pagehelper分页插件 -->
        <dependency>
            <groupId>com.github.pagehelper</groupId>
            <artifactId>pagehelper-spring-boot-starter</artifactId>
            <version>1.2.3</version>
        </dependency>

        <!-- 通用mapper -->
        <dependency>
            <groupId>tk.mybatis</groupId>
            <artifactId>mapper-spring-boot-starter</artifactId>
            <version>2.0.2</version>
        </dependency>


        <!-- 阿里巴巴druid数据库连接池 非必须 -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.0.18</version>
        </dependency>

2.代码目录结构

这里写图片描述
3.需要检查的点
3.1basemapper 不能和业务类的mapper放在同一目录下

3.2service实现类应该抽象的避免被通用mapper扫描

public abstract class BaseServiceImpl<T,ID extends Serializable> implements BaseService<T,ID> {
    @Autowired
    public MyBaseMapper<T> baseMapper;

3.3业务类mapper应该加上@Mapper注解，或者在spring boot启动类上添加@MapperScan注解

@Mapper
public interface MusicMapper extends MyBaseMapper<MusicModel> {
}

@SpringBootApplication
@MapperScan(basePackages ={"com.sinosoft.musicproxy.mapper"})
public class MusicProxyApplication  {
    public static void main(String[] args) {
        SpringApplication.run(MusicProxyApplication.class, args);
    }
}

3.4业务类应该继承你自己的通用mapper接口。我自己的错误就是吧MyBaseMapper写成了BaseMapper（这个错误是真的低级）

//错误
@Mapper
public interface MusicMapper extends BaseMapper<MusicModel> {
}

//正确
@Mapper
public interface MusicMapper extends MyBaseMapper<MusicModel> {
}

3.5namespace对应接口名

<mapper namespace="com.sinosoft.musicproxy.mapper.MusicMapper" >

package com.sinosoft.musicproxy.mapper;

/**
 * @author fxl
 * @Title: ${file_name}
 * @Package ${package_name}
 * @Description: ${todo}
 * @date 2018-06-149:55
 */
@Mapper
public interface MusicMapper extends BaseMapper<MusicModel> {
}