org.apache.ibatis.binding.BindingException: Invalid bound statement (not found): com.my.mapper.UserM

原因：xml文件只能在resources中过滤，UserMapper在resources外部。
方法一：拖进resourecs
方法二：在pom.xml中手动解析。

<build>
        <resources>
            <resource>
                <directory>src/main/java</directory>
                <includes>
                    <include>**/*.properties</include>
                    <include>**/*.xml</include>
                </includes>
                <filtering>false</filtering>
            </resource>
            <resource>
                <directory>src/main/resources</directory>
                <includes>
                    <include>**/*.properties</include>
                    <include>**/*.xml</include>
                </includes>
                <filtering>false</filtering>
            </resource>
        </resources>
    </build>