Today, in the mapper. XML file, I mistakenly annotated it with /* * code description */ and then reported this error
the specific exception is as follows

Caused by: org.xml.sax.SAXParseException; lineNumber: 134; columnNumber: 10, The element type "mapper" must match "(cache-ref|cache|resultMap*|parameterMap*|sql*|insert*|update*|delete*|select*)+"。

error code 

   /** Public conditions */
    <sql id="commonIfWhere">
        <if test='params.projectId != null and params.projectId != ""'>
            and project_id = #{params.projectId}
        </if>
        <if test='params.id!= null and params.id != ""'>
            and id = #{params.id}
        </if>
    </sql>

after correction

   <!-- Public conditions -->
    <sql id="commonIfWhere">
        <if test='params.projectId != null and params.projectId != ""'>
            and project_id = #{params.projectId}
        </if>
        <if test='params.id!= null and params.id != ""'>
            and id = #{params.id}
        </if>
    </sql>

The problem was solved smoothly