org.apache.commons.dbcp.SQLNestedException: Cannot load JDBC driver class

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org.springframework.transaction.CannotCreateTransactionException: Could not open JDBC Connection for transaction; nested exception is org.apache.commons.dbcp.SQLNestedException: Cannot load JDBC driver class ‘${jdbc.driverClassName}‘
at org.springframework.jdbc.datasource.DataSourceTransactionManager.doBegin(DataSourceTransactionManager.java:240)
at org.springframework.transaction.support.AbstractPlatformTransactionManager.getTransaction(AbstractPlatformTransactionManager.java:371)
at org.springframework.test.context.transaction.TransactionalTestExecutionListener$TransactionContext.startTransaction(TransactionalTestExecutionListener.java:513)
at org.springframework.test.context.transaction.TransactionalTestExecutionListener.startNewTransaction(TransactionalTestExecutionListener.java:271)
at org.springframework.test.context.transaction.TransactionalTestExecutionListener.beforeTestMethod(TransactionalTestExecutionListener.java:164)
at org.springframework.test.context.TestContextManager.beforeTestMethod(TestContextManager.java:358)
at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:73)
at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:83)
at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:72)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:231)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:47)
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$2.evaluate(ParentRunner.java:222)
at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)
at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:71)
at org.junit.runners.ParentRunner.run(ParentRunner.java:300)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:174)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)
Caused by: org.apache.commons.dbcp.SQLNestedException: Cannot load JDBC driver class ‘${jdbc.driverClassName}‘
at org.apache.commons.dbcp.BasicDataSource.createConnectionFactory(BasicDataSource.java:1429)
at org.apache.commons.dbcp.BasicDataSource.createDataSource(BasicDataSource.java:1371)
at org.apache.commons.dbcp.BasicDataSource.getConnection(BasicDataSource.java:1044)
at org.springframework.jdbc.datasource.DataSourceTransactionManager.doBegin(DataSourceTransactionManager.java:202)
... 25 more
Caused by: java.lang.ClassNotFoundException: ${jdbc.driverClassName}
at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
at org.apache.commons.dbcp.BasicDataSource.createConnectionFactory(BasicDataSource.java:1420)
... 28 more

 

 在spring裡使用org.mybatis.spring.mapper.MapperScannerConfigurer 進行自動掃描的時候，設定了sqlSessionFactory 的話，可能會導致PropertyPlaceholderConfigurer失效，也就是用${jdbc.username}這樣之類的運算式，將無法擷取到properties檔案裡的內容。 導致這一原因是因為，MapperScannerConigurer實際是在解析載入bean定義階段的，這個時候要是設定sqlSessionFactory的話，會導致提前初始化一些類，這個時候，PropertyPlaceholderConfigurer還沒來得及替換定義中的變數，導致把運算式當作字串複製了。 但如果不設定sqlSessionFactory 屬性的話，就必須要保證sessionFactory在spring中名稱一定要是sqlSessionFactory ，否則就無法自動注入。又或者直接定義 MapperFactoryBean ，再或者放棄自動代理介面方式。 


就是這個org.mybatis.spring.mapper.MapperScannerConfigurer中配置的bean下有屬性sqlSessionFactory，如果配置了，就去掉這個屬性，變成如下： 

Xml代碼  

1. <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">  
2.   
3.     <property value="com.hyq.showcase.mapper,com.hyq.common.core.mapper"  
4.         name="basePackage" />  
5.   
6. </bean>  
7. 以上的解決方案比較一般，在3.1.1版本中配置的時候提供了以下： 
   
   Xml代碼  
   1. <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">  
   2.   
   3.     <property name="basePackage" value="com.xxxx.dal.mapper" />  
   4.   
   5.     <property name="sqlSessionFactoryBeanName" value="ysSqlSessionFactory" />  
   6.   
   7.     <!-- <property name="sqlSessionFactory" ref="ysSqlSessionFactory"></property> -->  
   8.   
   9. </bean>  
   
   
   改用sqlSessionFactoryBeanName注入就沒有問題(不要使用sqlSessionFactory屬性注入，使用sqlSessionFactoryBeanName注入)，因為這時不會立即初始化sqlSessionFactory,傳入的只是名字，非bean，所以不會引發提前初始化問題。。 
   以上供參考! 
8. 引自：http://songjianyong.iteye.com/blog/1663170

org.apache.commons.dbcp.SQLNestedException: Cannot load JDBC driver class