电商平台学习笔记（三）——Mybatis启动异常org.apache.ibatis.type.TypeException
Posted on 2016-04-04 14:42 Iltxy 阅读(173) 评论(0) 收藏 举报今天准备使用MapperScannerConfigurer来扫包！以帮助从DAO层解脱出来（只需要定义接口）！结果就遇到了Bug。
异常内容如下：
1 java.lang.IllegalStateException: Failed to load ApplicationContext 2 at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContext(DefaultCacheAwareContextLoaderDelegate.java:124) 3 at org.springframework.test.context.support.DefaultTestContext.getApplicationContext(DefaultTestContext.java:83) 4 at org.springframework.test.context.support.DependencyInjectionTestExecutionListener.injectDependencies(DependencyInjectionTestExecutionListener.java:117) 5 at org.springframework.test.context.support.DependencyInjectionTestExecutionListener.prepareTestInstance(DependencyInjectionTestExecutionListener.java:83) 6 at org.springframework.test.context.TestContextManager.prepareTestInstance(TestContextManager.java:228) 7 at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.createTest(SpringJUnit4ClassRunner.java:230) 8 at org.springframework.test.context.junit4.SpringJUnit4ClassRunner$1.runReflectiveCall(SpringJUnit4ClassRunner.java:289) 9 at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12) 10 at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.methodBlock(SpringJUnit4ClassRunner.java:291) 11 at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:249) 12 at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:89) 13 at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238) 14 at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63) 15 at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236) 16 at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53) 17 at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229) 18 at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61) 19 at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:70) 20 at org.junit.runners.ParentRunner.run(ParentRunner.java:309) 21 at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:193) 22 at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:86) 23 at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38) 24 at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:459) 25 at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:675) 26 at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:382) 27 at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:192) 28 Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'brandServiceImpl': Injection of resource dependencies failed; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'brandDao' defined in file [E:\WorkSpace\NewBaBaSport\BaBaSport\target\classes\cn\ilxy\dao\product\BrandDao.class]: Unsatisfied dependency expressed through bean property 'sqlSessionFactory': Error creating bean with name 'sqlSessionFactory' defined in file [E:\WorkSpace\NewBaBaSport\BaBaSport\target\classes\config\mybatis.xml]: Invocation of init method failed; nested exception is org.apache.ibatis.type.TypeException: The alias 'BrandQuery' is already mapped to the value 'cn.ilxy.query.BrandQuery'.; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sqlSessionFactory' defined in file [E:\WorkSpace\NewBaBaSport\BaBaSport\target\classes\config\mybatis.xml]: Invocation of init method failed; nested exception is org.apache.ibatis.type.TypeException: The alias 'BrandQuery' is already mapped to the value 'cn.ilxy.query.BrandQuery'. 29 at org.springframework.context.annotation.CommonAnnotationBeanPostProcessor.postProcessPropertyValues(CommonAnnotationBeanPostProcessor.java:311) 30 at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1214) 31 at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:543) 32 at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482) 33 at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306) 34 at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) 35 at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302) 36 at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197) 37 at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:772) 38 at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:839) 39 at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:538) 40 at org.springframework.test.context.support.AbstractGenericContextLoader.loadContext(AbstractGenericContextLoader.java:125) 41 at org.springframework.test.context.support.AbstractGenericContextLoader.loadContext(AbstractGenericContextLoader.java:60) 42 at org.springframework.test.context.support.AbstractDelegatingSmartContextLoader.delegateLoading(AbstractDelegatingSmartContextLoader.java:109) 43 at org.springframework.test.context.support.AbstractDelegatingSmartContextLoader.loadContext(AbstractDelegatingSmartContextLoader.java:261) 44 at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContextInternal(DefaultCacheAwareContextLoaderDelegate.java:98) 45 at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContext(DefaultCacheAwareContextLoaderDelegate.java:116) 46 ... 25 more 47 Caused by: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'brandDao' defined in file [E:\WorkSpace\NewBaBaSport\BaBaSport\target\classes\cn\ilxy\dao\product\BrandDao.class]: Unsatisfied dependency expressed through bean property 'sqlSessionFactory': Error creating bean with name 'sqlSessionFactory' defined in file [E:\WorkSpace\NewBaBaSport\BaBaSport\target\classes\config\mybatis.xml]: Invocation of init method failed; nested exception is org.apache.ibatis.type.TypeException: The alias 'BrandQuery' is already mapped to the value 'cn.ilxy.query.BrandQuery'.; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sqlSessionFactory' defined in file [E:\WorkSpace\NewBaBaSport\BaBaSport\target\classes\config\mybatis.xml]: Invocation of init method failed; nested exception is org.apache.ibatis.type.TypeException: The alias 'BrandQuery' is already mapped to the value 'cn.ilxy.query.BrandQuery'. 48 at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.autowireByType(AbstractAutowireCapableBeanFactory.java:1307) 49 at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1199) 50 at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:543) 51 at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482) 52 at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306) 53 at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) 54 at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302) 55 at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202) 56 at org.springframework.context.annotation.CommonAnnotationBeanPostProcessor.autowireResource(CommonAnnotationBeanPostProcessor.java:512) 57 at org.springframework.context.annotation.CommonAnnotationBeanPostProcessor.getResource(CommonAnnotationBeanPostProcessor.java:486) 58 at org.springframework.context.annotation.CommonAnnotationBeanPostProcessor$ResourceElement.getResourceToInject(CommonAnnotationBeanPostProcessor.java:615) 59 at org.springframework.beans.factory.annotation.InjectionMetadata$InjectedElement.inject(InjectionMetadata.java:169) 60 at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:88) 61 at org.springframework.context.annotation.CommonAnnotationBeanPostProcessor.postProcessPropertyValues(CommonAnnotationBeanPostProcessor.java:308) 62 ... 41 more 63 Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sqlSessionFactory' defined in file [E:\WorkSpace\NewBaBaSport\BaBaSport\target\classes\config\mybatis.xml]: Invocation of init method failed; nested exception is org.apache.ibatis.type.TypeException: The alias 'BrandQuery' is already mapped to the value 'cn.ilxy.query.BrandQuery'. 64 at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1578) 65 at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:545) 66 at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482) 67 at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306) 68 at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) 69 at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302) 70 at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197) 71 at org.springframework.beans.factory.support.DefaultListableBeanFactory.findAutowireCandidates(DefaultListableBeanFactory.java:1192) 72 at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1116) 73 at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1014) 74 at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.autowireByType(AbstractAutowireCapableBeanFactory.java:1292) 75 ... 54 more 76 Caused by: org.apache.ibatis.type.TypeException: The alias 'BrandQuery' is already mapped to the value 'cn.ilxy.query.BrandQuery'. 77 at org.apache.ibatis.type.TypeAliasRegistry.registerAlias(TypeAliasRegistry.java:157) 78 at org.apache.ibatis.type.TypeAliasRegistry.registerAlias(TypeAliasRegistry.java:147) 79 at org.apache.ibatis.type.TypeAliasRegistry.registerAliases(TypeAliasRegistry.java:136) 80 at org.mybatis.spring.SqlSessionFactoryBean.buildSqlSessionFactory(SqlSessionFactoryBean.java:395) 81 at org.mybatis.spring.SqlSessionFactoryBean.afterPropertiesSet(SqlSessionFactoryBean.java:355) 82 at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1637) 83 at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1574) 84 ... 64 more
各位看官注意了，凭我看Mybatis这么多的异常的经验来看，一般java.lang.IllegalStateException: Failed to load ApplicationContext异常信息在最上面，多半是你写的配置文件有问题，这次我也是的。我利用Junit测试时，没有调用任何业务逻辑方法时也是报这个错误！
异常信息是说，Spring在扫包时，已经发现BrandQuery别名和cn.ilxy.query.BrandQuery类已经形成了对应关系，在继续扫描的过程中又发现了一个名为BrandQuery的类，故报此异常！后来看了看项目目录（如下图）：
看明白了没有，出现了两个名为BrandQuery的实体类！故报此异常！
解决方案：每个类名必须是独一无二的！不得重名！相信各位看官知道怎么改了吧！改类名就行了啦！分享出来，希望对各位程序猿对所帮助，少走弯路！
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