AreaDaoTest在JUnit Test时出错

来源：2-7 验证Dao

Kuuuu

2019-03-19

图片描述
上面是AreaDaoTest和BaseTest
下面是spring-dao的配置

<?xml version="1.0" encoding="UTF-8"?>

<context:property-placeholder
location=“classpath:jdbc.properties” />

<!-- 2.数据库连接池 -->
<bean id="dataSource"
	class="com.mchange.v2.c3p0.ComboPooledDataSource">
	<!-- 配置连接池属性 -->
	<property name="driverClass" value="${jdbc.driver}" />
	<property name="jdbcUrl" value="${jdbc.url}" />
	<property name="user" value="${jdbc.username}" />
	<property name="password" value="${jdbc.password}" />

	<!-- c3p0连接池的私有属性 -->
	<property name="maxPoolSize" value="30" />
	<property name="minPoolSize" value="10" />
	<!-- 关闭连接后不自动commit -->
	<property name="autoCommitOnClose" value="false" />
	<!-- 获取连接超时时间 -->
	<property name="checkoutTimeout" value="10000" />
	<!-- 当获取连接失败重试次数 -->
	<property name="acquireRetryAttempts" value="2" />
</bean>

<!-- 3.配置SqlSessionFactory对象 -->
<bean id="sqlSessionFactory"
	class="org.mybatis.spring.SqlSessionFactoryBean">
	<!-- 注入数据库连接池 -->
	<property name="dataSource" ref="dataSource" />
	<!-- 配置MyBaties全局配置文件:mybatis-config.xml -->
	<property name="configLocation"
		value="classpath:mybatis-config.xml" />
	<!-- 扫描entity包 使用别名 -->
	<property name="typeAliasesPackage"
		value="com.kuuu.o2o.entity" />
	<!-- 扫描sql配置文件:mapper需要的xml文件 -->
	<property name="mapperLocations"
		value="classpath:mapper/*.xml" />
</bean>

<!-- 4.配置扫描Dao接口包，动态实现Dao接口，注入到spring容器中 -->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
	<!-- 注入sqlSessionFactory -->
	<property name="sqlSessionFactoryBeanName"
		value="sqlSessionFactory" />
	<!-- 给出需要扫描Dao接口包 -->
	<property name="basePackage" value="com.kuuu.o2o.dao" />
</bean>

![图片描述](http://img.mukewang.com/szimg/5c90a1070001113303440618.jpg)

以下是错误信息：
三月 19, 2019 3:48:56 下午 org.springframework.context.support.GenericApplicationContext refresh
警告: Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.BeanCreationException: Error creating bean with name ‘sqlSessionFactory’ defined in class path resource [spring/spring-dao.xml]: Invocation of init method failed; nested exception is java.lang.NoClassDefFoundError: com/Kuuu/o2o/entity/Area (wrong name: com/kuuu/o2o/entity/Area)
三月 19, 2019 3:48:56 下午 org.springframework.test.context.TestContextManager prepareTestInstance
严重: Caught exception while allowing TestExecutionListener [org.springframework.test.context.support.DependencyInjectionTestExecutionListener@735f7ae5] to prepare test instance [com.kuuu.o2o.dao.AreaDaoTest@31e5415e]
java.lang.IllegalStateException: Failed to load ApplicationContext
at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContext(DefaultCacheAwareContextLoaderDelegate.java:124)
at org.springframework.test.context.support.DefaultTestContext.getApplicationContext(DefaultTestContext.java:83)
at org.springframework.test.context.support.DependencyInjectionTestExecutionListener.injectDependencies(DependencyInjectionTestExecutionListener.java:117)
at org.springframework.test.context.support.DependencyInjectionTestExecutionListener.prepareTestInstance(DependencyInjectionTestExecutionListener.java:83)
at org.springframework.test.context.TestContextManager.prepareTestInstance(TestContextManager.java:230)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.createTest(SpringJUnit4ClassRunner.java:228)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner$1.runReflectiveCall(SpringJUnit4ClassRunner.java:287)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.methodBlock(SpringJUnit4ClassRunner.java:289)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:247)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:94)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)
at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:70)
at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:191)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:89)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:41)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:541)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:763)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:463)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:209)
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name ‘sqlSessionFactory’ defined in class path resource [spring/spring-dao.xml]: Invocation of init method failed; nested exception is java.lang.NoClassDefFoundError: com/Kuuu/o2o/entity/Area (wrong name: com/kuuu/o2o/entity/Area)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1628)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:555)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:483)
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:742)
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:866)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:542)
at org.springframework.test.context.support.AbstractGenericContextLoader.loadContext(AbstractGenericContextLoader.java:128)
at org.springframework.test.context.support.AbstractGenericContextLoader.loadContext(AbstractGenericContextLoader.java:60)
at org.springframework.test.context.support.AbstractDelegatingSmartContextLoader.delegateLoading(AbstractDelegatingSmartContextLoader.java:108)
at org.springframework.test.context.support.AbstractDelegatingSmartContextLoader.loadContext(AbstractDelegatingSmartContextLoader.java:251)
at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContextInternal(DefaultCacheAwareContextLoaderDelegate.java:98)
at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContext(DefaultCacheAwareContextLoaderDelegate.java:116)
… 25 more
Caused by: java.lang.NoClassDefFoundError: com/Kuuu/o2o/entity/Area (wrong name: com/kuuu/o2o/entity/Area)
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(Unknown Source)
at java.security.SecureClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.access$100(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.net.URLClassLoader $1 . r u n (U n k n o w n S o u r c e) a t j a v a . s e c u r i t y . A c c e s s C o n t r o l l e r . d o P r i v i l e g e d (N a t i v e M e t h o d) a t j a v a . n e t . U R L C l a s s L o a d e r . f i n d C l a s s (U n k n o w n S o u r c e) a t j a v a . l a n g . C l a s s L o a d e r . l o a d C l a s s (U n k n o w n S o u r c e) a t s u n . m i s c . L a u n c h e r$ AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Unknown Source)
at org.apache.ibatis.io.ClassLoaderWrapper.classForName(ClassLoaderWrapper.java:186)
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)
at org.apache.ibatis.builder.BaseBuilder.resolveAlias(BaseBuilder.java:149)
at org.apache.ibatis.builder.BaseBuilder.resolveClass(BaseBuilder.java:116)
at org.apache.ibatis.builder.xml.XMLStatementBuilder.parseStatementNode(XMLStatementBuilder.java:74)
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)
at org.apache.ibatis.builder.xml.XMLMapperBuilder.parse(XMLMapperBuilder.java:92)
at org.mybatis.spring.SqlSessionFactoryBean.buildSqlSessionFactory(SqlSessionFactoryBean.java:521)
at org.mybatis.spring.SqlSessionFactoryBean.afterPropertiesSet(SqlSessionFactoryBean.java:380)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1687)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1624)
… 40 more

在自己网上查阅后，看大部分说NoClassDefFoundError发生的原因是：
当发生由于缺少jar文件，或者jar文件没有添加到classpath，或者jar的文件名发生变更会导致java.lang.NoClassDefFoundError的错误。
当类不在classpath中时，这种情况很难确切的知道，但如果在程序中打印出System.getproperty(“java.classpath”)，可以得到程序实际运行的classpath
运行时明确指定你认为程序能正常运行的 -classpath 参数，如果增加之后程序能正常运行，说明原来程序的classpath被其他人覆盖了。
NoClassDefFoundError也可能由于类的静态初始化模块错误导致，当你的类执行一些静态初始化模块操作，如果初始化模块抛出异常，哪些依赖这个类的其他类会抛出NoClassDefFoundError的错误。如果你查看程序日志，会发现一些java.lang.ExceptionInInitializerError的错误日志，ExceptionInInitializerError的错误会导致java.lang.NoClassDefFoundError: Could not initialize class，

根据这些检查和改正后依然报错希望老师指点一下

写回答

1回答

翔仔

2019-03-20

已采纳

同学好，我看错误是Caused by: java.lang.NoClassDefFoundError: com/Kuuu/o2o/entity/Area (wrong name: com/kuuu/o2o/entity/Area)

说的是这个Area的类找不到呢。看看是spring-dao.xm里的

	<property name="typeAliasesPackage"
		value="com.kuuu.o2o.entity" />

package设置错误还是mapper里面的 Area设置错误？

如果都不是，可能请问同学是如何执行这个类的，感觉像从cmd里面去手工执行junit指令而不是用eclipse执行报的错，执行指令的目录不对？（前提是先检查好上面说的哈）

Kuuuu

问题已解决，谢谢老师又认真的看了一遍课程发现是mapperl里面的地址设置错了

2019-03-20

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