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：
1 org.hibernate.service.classloading.spi.ClassLoadingException: Specified JDBC Driver com.mysql.jdbc.Driver class not found 2 at org.hibernate.service.jdbc.connections.internal.DriverManagerConnectionProviderImpl.configure(DriverManagerConnectionProviderImpl.java:107) 3 at org.hibernate.service.internal.StandardServiceRegistryImpl.configureService(StandardServiceRegistryImpl.java:75) 4 at org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService(AbstractServiceRegistryImpl.java:159) 5 at org.hibernate.service.internal.AbstractServiceRegistryImpl.getService(AbstractServiceRegistryImpl.java:131) 6 at org.hibernate.engine.jdbc.internal.JdbcServicesImpl.buildJdbcConnectionAccess(JdbcServicesImpl.java:223) 7 at org.hibernate.engine.jdbc.internal.JdbcServicesImpl.configure(JdbcServicesImpl.java:89) 8 at org.hibernate.service.internal.StandardServiceRegistryImpl.configureService(StandardServiceRegistryImpl.java:75) 9 at org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService(AbstractServiceRegistryImpl.java:159) 10 at org.hibernate.service.internal.AbstractServiceRegistryImpl.getService(AbstractServiceRegistryImpl.java:131) 11 at org.hibernate.cfg.SettingsFactory.buildSettings(SettingsFactory.java:71) 12 at org.hibernate.cfg.Configuration.buildSettingsInternal(Configuration.java:2277) 13 at org.hibernate.cfg.Configuration.buildSettings(Configuration.java:2273) 14 at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1742) 15 at com.hibtest.entity.TestUsers.testShemaExport(TestUsers.java:23) 16 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 17 at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) 18 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) 19 at java.lang.reflect.Method.invoke(Method.java:597) 20 at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:45) 21 at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15) 22 at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:42) 23 at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20) 24 at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:263) 25 at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:68) 26 at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:47) 27 at org.junit.runners.ParentRunner$3.run(ParentRunner.java:231) 28 at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:60) 29 at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:229) 30 at org.junit.runners.ParentRunner.access$000(ParentRunner.java:50) 31 at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:222) 32 at org.junit.runners.ParentRunner.run(ParentRunner.java:300) 33 at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50) 34 at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38) 35 at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467) 36 at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683) 37 at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390) 38 at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197) 39 Caused by: org.hibernate.service.classloading.spi.ClassLoadingException: Unable to load class [com.mysql.jdbc.Driver] 40 at org.hibernate.service.classloading.internal.ClassLoaderServiceImpl.classForName(ClassLoaderServiceImpl.java:141) 41 at org.hibernate.service.jdbc.connections.internal.DriverManagerConnectionProviderImpl.configure(DriverManagerConnectionProviderImpl.java:104) 42 ... 36 more 43 Caused by: java.lang.ClassNotFoundException: Could not load requested class : com.mysql.jdbc.Driver 44 at org.hibernate.service.classloading.internal.ClassLoaderServiceImpl$1.findClass(ClassLoaderServiceImpl.java:99) 45 at java.lang.ClassLoader.loadClass(ClassLoader.java:306) 46 at java.lang.ClassLoader.loadClass(ClassLoader.java:247) 47 at java.lang.Class.forName0(Native Method) 48 at java.lang.Class.forName(Class.java:247) 49 at org.hibernate.service.classloading.internal.ClassLoaderServiceImpl.classForName(ClassLoaderServiceImpl.java:138) 50 ... 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。