MyException--org.apache.ibatis.exceptions.PersistenceException: ### Error building SqlSession. ###

org.apache.ibatis.exceptions.PersistenceException: 

### Error building SqlSession.

### The error may exist in cn/itcast/mybatis/mapper/OrdersMapperCustom.xml

### The error occurred while processing mapper_resultMap[OrdersUserResultMap]_association[user]

### Cause: org.apache.ibatis.builder.BuilderException: Error parsing SQL Mapper Configuration. Cause: org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. Cause:
org.apache.ibatis.builder.BuilderException: Error resolving class. Cause: org.apache.ibatis.type.TypeException: Could not resolve type alias 'OrdersUserResultMap'.  Cause: java.lang.ClassNotFoundException: Cannot find class:
OrdersUserResultMap

at org.apache.ibatis.exceptions.ExceptionFactory.wrapException(ExceptionFactory.java:26)

at org.apache.ibatis.session.SqlSessionFactoryBuilder.build(SqlSessionFactoryBuilder.java:82)

at org.apache.ibatis.session.SqlSessionFactoryBuilder.build(SqlSessionFactoryBuilder.java:66)

at cn.itcast.mybatis.mapper.OrdersMapperCustomTest.setUp(OrdersMapperCustomTest.java:26)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

at java.lang.reflect.Method.invoke(Method.java:606)

at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44)

at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)

at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)

at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:27)

at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:263)

at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:69)

at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:48)

at org.junit.runners.ParentRunner$3.run(ParentRunner.java:231)

at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:60)

at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:229)

at org.junit.runners.ParentRunner.access$000(ParentRunner.java:50)

at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:222)

at org.junit.runners.ParentRunner.run(ParentRunner.java:292)

at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)

at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)

at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)

at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)

at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)

at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)

Caused by: org.apache.ibatis.builder.BuilderException: Error parsing SQL Mapper Configuration. Cause: org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. Cause: org.apache.ibatis.builder.BuilderException: Error resolving class. Cause: org.apache.ibatis.type.TypeException:
Could not resolve type alias 'OrdersUserResultMap'.  Cause: java.lang.ClassNotFoundException: Cannot find class: OrdersUserResultMap

at org.apache.ibatis.builder.xml.XMLConfigBuilder.parseConfiguration(XMLConfigBuilder.java:109)

at org.apache.ibatis.builder.xml.XMLConfigBuilder.parse(XMLConfigBuilder.java:92)

at org.apache.ibatis.session.SqlSessionFactoryBuilder.build(SqlSessionFactoryBuilder.java:80)

... 25 more

Caused by: org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. Cause: org.apache.ibatis.builder.BuilderException: Error resolving class. Cause: org.apache.ibatis.type.TypeException: Could not resolve type alias 'OrdersUserResultMap'.  Cause:
java.lang.ClassNotFoundException: Cannot find class: OrdersUserResultMap

at org.apache.ibatis.builder.xml.XMLMapperBuilder.configurationElement(XMLMapperBuilder.java:120)

at org.apache.ibatis.builder.xml.XMLMapperBuilder.parse(XMLMapperBuilder.java:92)

at org.apache.ibatis.builder.annotation.MapperAnnotationBuilder.loadXmlResource(MapperAnnotationBuilder.java:164)

at org.apache.ibatis.builder.annotation.MapperAnnotationBuilder.parse(MapperAnnotationBuilder.java:118)

at org.apache.ibatis.binding.MapperRegistry.addMapper(MapperRegistry.java:71)

at org.apache.ibatis.binding.MapperRegistry.addMappers(MapperRegistry.java:96)

at org.apache.ibatis.binding.MapperRegistry.addMappers(MapperRegistry.java:104)

at org.apache.ibatis.session.Configuration.addMappers(Configuration.java:647)

at org.apache.ibatis.builder.xml.XMLConfigBuilder.mapperElement(XMLConfigBuilder.java:313)

at org.apache.ibatis.builder.xml.XMLConfigBuilder.parseConfiguration(XMLConfigBuilder.java:107)

... 27 more

Caused by: org.apache.ibatis.builder.BuilderException: Error resolving class. Cause: org.apache.ibatis.type.TypeException: Could not resolve type alias 'OrdersUserResultMap'.  Cause: java.lang.ClassNotFoundException: Cannot find class: OrdersUserResultMap

at org.apache.ibatis.builder.BaseBuilder.resolveClass(BaseBuilder.java:103)

at org.apache.ibatis.builder.xml.XMLStatementBuilder.parseStatementNode(XMLStatementBuilder.java:72)

at org.apache.ibatis.builder.xml.XMLMapperBuilder.buildStatementFromContext(XMLMapperBuilder.java:135)

at org.apache.ibatis.builder.xml.XMLMapperBuilder.buildStatementFromContext(XMLMapperBuilder.java:128)

at org.apache.ibatis.builder.xml.XMLMapperBuilder.configurationElement(XMLMapperBuilder.java:118)

... 36 more

Caused by: org.apache.ibatis.type.TypeException: Could not resolve type alias 'OrdersUserResultMap'.  Cause: java.lang.ClassNotFoundException: Cannot find class: OrdersUserResultMap

at org.apache.ibatis.type.TypeAliasRegistry.resolveAlias(TypeAliasRegistry.java:117)

at org.apache.ibatis.builder.BaseBuilder.resolveAlias(BaseBuilder.java:130)

at org.apache.ibatis.builder.BaseBuilder.resolveClass(BaseBuilder.java:101)

... 40 more

Caused by: java.lang.ClassNotFoundException: Cannot find class: OrdersUserResultMap

at org.apache.ibatis.io.ClassLoaderWrapper.classForName(ClassLoaderWrapper.java:190)

at org.apache.ibatis.io.ClassLoaderWrapper.classForName(ClassLoaderWrapper.java:89)

at org.apache.ibatis.io.Resources.classForName(Resources.java:256)

at org.apache.ibatis.type.TypeAliasRegistry.resolveAlias(TypeAliasRegistry.java:113)

... 42 more

以上就是我在学习mybatis中，定义statement时，把resultMap定义成了resultType，所以出现了这样的错误信息。

<!-- 查询订单关联查询用户信息,使用resultMap -->

<select id="findOrdersUserResultMap"
resultType="OrdersUserResultMap">

SELECT 

orders.*,

  USER.username,

  USER.sex,

  USER.address 

FROM

  orders,

  USER 

WHERE orders.user_id = user.id

</select>

    细节真的很重要，害我检查了好长时间，第二次了，好懵逼的感觉。。。。