ibatis抛出Closing non transactional SqlSession异常怎么解决？

DEBUG - ==>  Preparing: select category_id,category_name,level,parent_id,create_time，sffj from product_category
DEBUG - ==> Parameters:
DEBUG - <==      Total: 25
DEBUG - Closing non transactional SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@7271d362]
WARN - Handler execution resulted in exception: null

应该是xml配置的问题，但是我找不出来

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.tmhome.mall.dao.ProductCategoryDao">

    <resultMap type="com.tmhome.mall.model.ProductCategory" id="productCategoryMap">
        <result property="categoryId" column="category_id" />
        <result property="categoryName" column="category_name" />
        <result property="level" column="level" />
        <result property="parentId" column="parent_id" />
        <result property="createTime" column="create_time" />
        <result property="sffj" column="sffj"  jdbcType="TINYINT" />
        
    </resultMap>

<select id="selectByPrimaryKey" parameterType="com.tmhome.mall.model.ProductCategory" resultMap="productCategoryMap">
        select category_id,category_name,level,parent_id,create_time, sffj
        from product_category
        where category_id = #{categoryId,jdbcType=INTEGER}
    </select>
    <select id="selectAll" parameterType="com.tmhome.mall.model.ProductCategory" resultMap="productCategoryMap">
        select category_id,category_name,level,parent_id,create_time, sffj
        from product_category
    </select>

</mapper>