hibernate配置C3P0连接池出现could not find org.hibernate.connection.C3P0Connecti问题

hibernate配置C3P0连接池出现could not find org.hibernate.connection.C3P0Connecti问题

错误:WARN ConnectionProviderFactory:152 - c3p0 properties is specificed, but could not find org.hibernate.connection.C3P0ConnectionProvider from the classpath, these properties are going to be ignored.

原因及解决方法:
hibernate只从3.3版本以后,org.hibernate.connection.C3P0ConnectionProvider移动到hibernate-c3p0包中,所以你需要导入hibernate-c3p0这个包才能使用c3p0,
或者在maven工程的pom文件添加(此处用的hibernate版本是4.3.5.Final,添加此包需要根据自己项目中使用的hibernate版本来选择)

<dependency>
        <groupId>org.hibernate</groupId>
        <artifactId>hibernate-c3p0</artifactId>
        <version>4.3.5.Final</version>
</dependency>
开始报错如下,需更换c3p0 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:1885) at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1843) at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1928) at test.UserTest01.save(UserTest01.java:20) 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.HibernateException: Could not instantiate connection provider [org.hibernate.connection.C3P0ConnectionProvider] 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) ... 34 more Caused by: org.hibernate.boot.registry.selector.spi.StrategySelectionException: Unable to resolve name [org.hibernate.connection.C3P0ConnectionProvider] as strategy [org.hibernate.engine.jdbc.connections.spi.ConnectionProvider] at org.hibernate.boot.registry.selector.internal.StrategySelectorImpl.selectStrategyImplementor(StrategySelectorImpl.java:128) at org.hibernate.engine.jdbc.connections.internal.ConnectionProviderInitiator.instantiateExplicitConnectionProvider(ConnectionProviderInitiator.java:194) ... 38 more
引用\[1\]和\[2\]中的错误信息表明事务结束时发生了错误,具体错误是"Could not commit JDBC transaction; nested exception is java.sql.SQLException: Connection com.mysql.jdbc.JDBC4Connection@66fcd8bf is closed." 这个错误表明在提交事务时发生了异常,异常原因是连接已关闭。引用\[3\]中的配置信息显示了数据库连接的相关配置括驱动、URL、用户名和密码。 根据提供的信息,错误的原因是在提交事务时连接已关闭。这可能是由于连接在事务过程中被意外关闭导致的。要解决这个问题,可以检查代码中是否正确地管理了数据库连接,确保在事务结束之前不会关闭连接。另外,还可以检查数据库连接池配置,确保连接池能够正确地管理连接的生命周期。 总结回答: "Could not roll back JDBC @ transaction; nested exception is java.sql.sQLException: Connection i closerd"错误表明在回滚事务时发生了异常,异常原因是连接已关闭。为了解决这个问题,需要检查代码中是否正确地管理了数据库连接,并确保连接在事务结束之前不会被关闭。此外,还可以检查数据库连接池配置,确保连接池能够正确地管理连接的生命周期。 #### 引用[.reference_title] - *1* *2* [事务结束发生错误,错误信息:Could not commit ... nested exception is java.sql.SQLException: Connecti](https://blog.csdn.net/qq_39201012/article/details/122208625)[target="_blank" data-report-click={"spm":"1018.2226.3001.9630","extra":{"utm_source":"vip_chatgpt_common_search_pc_result","utm_medium":"distribute.pc_search_result.none-task-cask-2~all~insert_cask~default-1-null.142^v91^insert_down28v1,239^v3^insert_chatgpt"}} ] [.reference_item] - *3* [Could not open JDBC Connection for transaction; nested exception is java.sql.SQLException: Cannot c](https://blog.csdn.net/m0_51005666/article/details/124912644)[target="_blank" data-report-click={"spm":"1018.2226.3001.9630","extra":{"utm_source":"vip_chatgpt_common_search_pc_result","utm_medium":"distribute.pc_search_result.none-task-cask-2~all~insert_cask~default-1-null.142^v91^insert_down28v1,239^v3^insert_chatgpt"}} ] [.reference_item] [ .reference_list ]
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