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用例图练习
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 unnamed not found for the web module
Cause: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Unknown error 1146
Caused by: java.lang.IllegalArgumentException: Parameter Maps collection does not contain value for com.bj186.crm.pojo.User
mybatis中配置中引入properties文件
 Caused by: java.lang.IllegalArgumentException: Parameter Maps collection does not contain value for com.bj186.crm.mapper.UserMapper.Integer
Caused by: java.lang.ClassNotFoundException: Cannot find class: User
ERROR StatusLogger Log4j2 could not find a logging implementation. Please add log4j-core to the classpath
原文地址：https://www.cnblogs.com/czhh/p/4925185.html

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