mybatis-config.xml配置文件配置时，要注意节点顺序
<properties>...</properties> <settings>...</settings> <typeAliases>...</typeAliases> <typeHandlers>...</typeHandlers> <objectFactory>...</objectFactory> <objectWrapperFactory>...</objectWrapperFactory> <plugins>...</plugins> <environments>...</environments> <databaseIdProvider>...</databaseIdProvider> <mappers>...</mappers>
原文：https://www.cnblogs.com/flypig666/p/11838885.html