org.hibernate.service.spi.ServiceException: Unable to create requested service [org.hibernate.engine.jdbc.connections.spi.ConnectionProvider] at org.hibernate.service.internal.AbstractServiceRegistryImpl.createService(AbstractServiceRegistryImpl.java:261) at org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService(AbstractServiceRegistryImpl.java:225) at org.hibernate.service.internal.AbstractServiceRegistryImpl.getService(AbstractServiceRegistryImpl.java:206) at org.hibernate.engine.jdbc.internal.JdbcServicesImpl.buildJdbcConnectionAccess(JdbcServicesImpl.java:260) at org.hibernate.engine.jdbc.internal.JdbcServicesImpl.configure(JdbcServicesImpl.java:94) at org.hibernate.boot.registry.internal.StandardServiceRegistryImpl.configureService(StandardServiceRegistryImpl.java:111) at org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService(AbstractServiceRegistryImpl.java:234) at org.hibernate.service.internal.AbstractServiceRegistryImpl.getService(AbstractServiceRegistryImpl.java:206) at org.hibernate.cfg.Configuration.buildTypeRegistrations(Configuration.java:1887) at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1845) at com.zhaogd.myapplication.test.Test.main(Test.java:30) Caused by: org.hibernate.HibernateException: Could not instantiate connection provider [oracle.jdbc.driver.OracleDriver] at org.hibernate.engine.jdbc.connections.internal.ConnectionProviderInitiator.instantiateExplicitConnectionProvider(ConnectionProviderInitiator.java:197) at org.hibernate.engine.jdbc.connections.internal.ConnectionProviderInitiator.initiateService(ConnectionProviderInitiator.java:120) at org.hibernate.engine.jdbc.connections.internal.ConnectionProviderInitiator.initiateService(ConnectionProviderInitiator.java:55) at org.hibernate.boot.registry.internal.StandardServiceRegistryImpl.initiateService(StandardServiceRegistryImpl.java:105) at org.hibernate.service.internal.AbstractServiceRegistryImpl.createService(AbstractServiceRegistryImpl.java:251) ... 10 more Caused by: java.lang.ClassCastException: oracle.jdbc.driver.OracleDriver cannot be cast to org.hibernate.engine.jdbc.connections.spi.ConnectionProvider at org.hibernate.engine.jdbc.connections.internal.ConnectionProviderInitiator.instantiateExplicitConnectionProvider(ConnectionProviderInitiator.java:194) ... 14 more
今天使用Hibernate 搞了好半天没有搞好，网上搜索这个问题可能是问题太低级了没有搜到 认真比较原来是Hibernate配置文件中<property name="connection.provider_class">oracle.jdbc.driver.OracleDriver</property>写错了 应该是
<property name="connection.driver_class">oracle.jdbc.driver.OracleDriver</property> 导致orcale中的驱动包ojdbc6.jar，Hibernate没有加载。
虽然错误有点低级，但是还是写下来纪念一下，哈哈！
原文：http://www.cnblogs.com/zhaogd/p/5215310.html