mybatis报错：The alias 'xxx' is already mapped to the value 'com.demo.xxx'
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项目编译时，报错如下：
Caused by: org.apache.ibatis.type.TypeException: The alias 'xxx' is already mapped to the value 'com.demo.xxx'.at org.apache.ibatis.type.TypeAliasRegistry.registerAlias(TypeAliasRegistry.java:151)at org.apache.ibatis.type.TypeAliasRegistry.registerAlias(TypeAliasRegistry.java:144)at org.apache.ibatis.type.TypeAliasRegistry.registerAliases(TypeAliasRegistry.java:133)at org.apache.ibatis.type.TypeAliasRegistry.registerAliases(TypeAliasRegistry.java:122)at org.apache.ibatis.builder.xml.XMLConfigBuilder.typeAliasesElement(XMLConfigBuilder.java:118)at org.apache.ibatis.builder.xml.XMLConfigBuilder.parseConfiguration(XMLConfigBuilder.java:99)... 64 more
经过分析，原来是因为配置文件中，mybatis指定别名时，指定的是一个包路径，而不是一个具体的类。恰巧该项目依赖的jar包中，有2个不同jar包，存在同名类，并且所在包路径的顶层是相同的，故而出现此错误。
修改方法很简单，可以修改配置文件中的包路径，或者修改其中一个类名。
从mybatis源码的角度分析该错误的来源，请查看大牛文章：
http://my.oschina.net/zimingforever/blog/478137
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