org.apache.ibatis.binding.BindingException: Invalid bound statement (not found):

今天在搭建springcloud项目时，发现如上错误，顺便整理一下这个异常：

1. mapper.xml的命名空间（namespace）是否跟mapper的接口路径一致

<mapper namespace="com.baicun.springcloudprovider.mapper.SysUserMapper">

2.mapper.xml接口名是否和mapper.java接口名一致

mapper.java -->  SysUser selectById(@Param("id") Integer id);

mapper.xml --> <select id="selectById" parameterType="java.lang.Integer" resultType="com.baicun.bean.SysUser">

3. 查看target.classes包下有没有生成mapper.xml文件，如果没有：

<resources>    
    <resource>    
        <directory>src/main/java</directory>    
        <includes>    
            <include>**/*.xml</include>    
        </includes>    
        <filtering>true</filtering>    
    </resource>    
</resources>   

4.mapper类和mapper.xml不在同一个路径下时，application.yml文件需要配置 mapper-locations

mybatis:
  mapper-locations: classpath:mapper/*.xml