【Mybatis】target is null for method size

本文转载自查看原文 2021-11-18 15:01 1618

问题是因为Mapper集合标签处理不够严谨导致

例如集合参数是空的情况，直接执行遍历导致此异常的出现

            <if test="params.companyCodes != null and params.companyCodes.size() > 0">
                AND coop.COMPANY_CODE IN
                <foreach collection="params.companyCodes" item="companyCode" separator=", " open="(" close=")" >#{companyCode}</foreach>
            </if>

我这里问题是没注意到NULL，而是集合size大于0，所以疏忽了，IF判断的逻辑不够充分

异常参考自：

https://blog.csdn.net/qq_41070393/article/details/97235805

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