如何解决Mybatis--java.lang.IllegalArgumentException: Result Maps collection already contains value for X
2016-12-26 15:05
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这两天因为项目需要整合spring、struts2、mybatis三大框架,但启动的时候总出现这个错误,困扰我好久,在网上找到的答案都不是我想要的,今天终于知道原因了。
user-mapper.xml如下:
<?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.bmdc.dj.user.dao.UserDao"> <resultMap type="user" id="userResult"> <id property="user_id" column="USER_ID"/> <result property="login_name" column="LOGIN_NAME"/> <result property="real_name" column="REAL_NAME"/> <result property="password" column="PASSWORD"/> </resultMap> <insert id="add" parameterType="user"> insert into users (user_id, login_name, real_name, password) values(#{user_id}, #{login_name}, #{real_name}, #{password}) </insert> </mapper>
其中,namespace是接口路径。
Mybatis.xml如下:
<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "http://mybatis.org/dtd/mybatis-3-config.dtd"> <configuration> <!-- 别名 --> <typeAliases> <typeAlias type="com.bmdc.dj.user.domain.User" alias="user"/> </typeAliases> <mappers> <mapper resource="com/bmdc/dj/user/dao/user-mapper.xml" /> </mappers> </configuration>
其他配置文件都正确,我就不写了。这样就会出现 Java.lang.IllegalArgumentException: Result Maps collection already contains value for XXX这个错误。
解决办法是:删除Mybatis.xml中的<mappers>标签所有内容。因为如果user-mapper.xml与namespace的接口在同一路径下,就不需要在mybaits.xml中再进行配置了。
修改后的Mybatis.xml如下:
<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "http://mybatis.org/dtd/mybatis-3-config.dtd"> <configuration> <!-- 别名 --> <typeAliases> <typeAlias type="com.bmdc.dj.user.domain.User" alias="user"/> </typeAliases> </configuration>
以上所述是小编给大家介绍的如何解决Mybatis--java.lang.IllegalArgumentException: Result Maps collection already contains value for X,希望对大家有所帮助,如果大家有任何疑问请给我留言,小编会及时回复大家的。在此也非常感谢大家对脚本之家网站的支持!
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