今天在使用hibernate搭建开发环境的时候出现了一个不可思议的问题：

 org.hibernate.service.classloading.spi.ClassLoadingException: Specified JDBC Driver com.mysql.jdbc.Driver class not found

     at org.hibernate.service.jdbc.connections.internal.DriverManagerConnectionProviderImpl.configure(DriverManagerConnectionProviderImpl.java:107)

     at org.hibernate.service.internal.StandardServiceRegistryImpl.configureService(StandardServiceRegistryImpl.java:75)

     at org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService(AbstractServiceRegistryImpl.java:159)

     at org.hibernate.service.internal.AbstractServiceRegistryImpl.getService(AbstractServiceRegistryImpl.java:131)

     at org.hibernate.engine.jdbc.internal.JdbcServicesImpl.buildJdbcConnectionAccess(JdbcServicesImpl.java:223)

     at org.hibernate.engine.jdbc.internal.JdbcServicesImpl.configure(JdbcServicesImpl.java:89)

     at org.hibernate.service.internal.StandardServiceRegistryImpl.configureService(StandardServiceRegistryImpl.java:75)

     at org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService(AbstractServiceRegistryImpl.java:159)

     at org.hibernate.service.internal.AbstractServiceRegistryImpl.getService(AbstractServiceRegistryImpl.java:131)

     at org.hibernate.cfg.SettingsFactory.buildSettings(SettingsFactory.java:71)

     at org.hibernate.cfg.Configuration.buildSettingsInternal(Configuration.java:2277)

     at org.hibernate.cfg.Configuration.buildSettings(Configuration.java:2273)

     at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1742)

     at com.hibtest.entity.TestUsers.testShemaExport(TestUsers.java:23)

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

     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)

     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)

     at java.lang.reflect.Method.invoke(Method.java:597)

     at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:45)

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

     at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:42)

     at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)

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

     at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:68)

     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.junit.runners.ParentRunner.run(ParentRunner.java:300)

     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.hibernate.service.classloading.spi.ClassLoadingException: Unable to load class [com.mysql.jdbc.Driver]

     at org.hibernate.service.classloading.internal.ClassLoaderServiceImpl.classForName(ClassLoaderServiceImpl.java:141)

     at org.hibernate.service.jdbc.connections.internal.DriverManagerConnectionProviderImpl.configure(DriverManagerConnectionProviderImpl.java:104)

     ... 36 more

 Caused by: java.lang.ClassNotFoundException: Could not load requested class : com.mysql.jdbc.Driver

     at org.hibernate.service.classloading.internal.ClassLoaderServiceImpl$1.findClass(ClassLoaderServiceImpl.java:99)

     at java.lang.ClassLoader.loadClass(ClassLoader.java:306)

     at java.lang.ClassLoader.loadClass(ClassLoader.java:247)

     at java.lang.Class.forName0(Native Method)

     at java.lang.Class.forName(Class.java:247)

     at org.hibernate.service.classloading.internal.ClassLoaderServiceImpl.classForName(ClassLoaderServiceImpl.java:138)

     ... 37 more

1， 我的jar包有：

　　　　

2， 之前使用的数据库连接驱动包是：

　　　　

3， 总结：

　　　　总之遇到这种问题一般都是导入的数据库连接jar包存在问题导致的，可能版本或者其它什么原因。因此解决方案就是可以换其它版本的jar包试试。

　　　　

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