使用Mybatis报错如下：
Caused by: org.apache.ibatis.builder.BuilderException: Error parsing SQL Mapper Configuration. Cause: org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. The XML location is ‘com/kq/dao/UserMapper.xml’. Cause: org.apache.ibatis.builder.BuilderException: Error resolving class. Cause: org.apache.ibatis.type.TypeException: Could not resolve type alias ‘UserMap’. Cause: java.lang.ClassNotFoundException: Cannot find class: UserMap
at org.apache.ibatis.builder.xml.XMLConfigBuilder.parseConfiguration(XMLConfigBuilder.java:122)
at org.apache.ibatis.builder.xml.XMLConfigBuilder.parse(XMLConfigBuilder.java:99)
at org.apache.ibatis.session.SqlSessionFactoryBuilder.build(SqlSessionFactoryBuilder.java:78)
… 25 more
Caused by: org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. The XML location is ‘com/kq/dao/UserMapper.xml’. Cause: org.apache.ibatis.builder.BuilderException: Error resolving class. Cause: org.apache.ibatis.type.TypeException: Could not resolve type alias ‘UserMap’. Cause: java.lang.ClassNotFoundException: Cannot find class: UserMap
at org.apache.ibatis.builder.xml.XMLMapperBuilder.configurationElement(XMLMapperBuilder.java:123)
at org.apache.ibatis.builder.xml.XMLMapperBuilder.parse(XMLMapperBuilder.java:95)
at org.apache.ibatis.builder.xml.XMLConfigBuilder.mapperElement(XMLConfigBuilder.java:377)
at org.apache.ibatis.builder.xml.XMLConfigBuilder.parseConfiguration(XMLConfigBuilder.java:120)
… 27 more
Caused by: org.apache.ibatis.builder.BuilderException: Error resolving class. Cause: org.apache.ibatis.type.TypeException: Could not resolve type alias ‘UserMap’. Cause: java.lang.ClassNotFoundException: Cannot find class: UserMap
at org.apache.ibatis.builder.BaseBuilder.resolveClass(BaseBuilder.java:118)
at org.apache.ibatis.builder.xml.XMLStatementBuilder.parseStatementNode(XMLStatementBuilder.java:102)
at org.apache.ibatis.builder.xml.XMLMapperBuilder.buildStatementFromContext(XMLMapperBuilder.java:138)
at org.apache.ibatis.builder.xml.XMLMapperBuilder.buildStatementFromContext(XMLMapperBuilder.java:131)
at org.apache.ibatis.builder.xml.XMLMapperBuilder.configurationElement(XMLMapperBuilder.java:121)
… 30 more
Caused by: org.apache.ibatis.type.TypeException: Could not resolve type alias ‘UserMap’. Cause: java.lang.ClassNotFoundException: Cannot find class: UserMap
at org.apache.ibatis.type.TypeAliasRegistry.resolveAlias(TypeAliasRegistry.java:120)
at org.apache.ibatis.builder.BaseBuilder.resolveAlias(BaseBuilder.java:149)
at org.apache.ibatis.builder.BaseBuilder.resolveClass(BaseBuilder.java:116)
… 34 more
Caused by: java.lang.ClassNotFoundException: Cannot find class: UserMap
at org.apache.ibatis.io.ClassLoaderWrapper.classForName(ClassLoaderWrapper.java:196)
at org.apache.ibatis.io.ClassLoaderWrapper.classForName(ClassLoaderWrapper.java:89)
at org.apache.ibatis.io.Resources.classForName(Resources.java:261)
at org.apache.ibatis.type.TypeAliasRegistry.resolveAlias(TypeAliasRegistry.java:116)
… 36 more
解决：
1. 先看一下你有没有使用ResultMap的来定义返回的结果集合，如果有的话看一下你的那个配置xmlSQL语句映射的的那个返回集结果类型是resultType还是resultMap类型的，如果是resultType类型的话，那就对了，把resultType改成resultMap类型，应该就对了。
2. 原因是：当你使用自定义的resultMap为返回的结果集的时候，你没有把SQL语句的那个xml文件中的那个resultType改成resultMap，导致找不到你自定义的那个resultMap的结果集的id，也就是 Cause: java.lang.ClassNotFoundException: Cannot find class: <这里就是你的自定义resultMap的id名>