Hibernate 错误记录Connections could not be acquired from the underlying database!

错误详情
网上的解决办法
我的错误解决

错误详情

org.hibernate.exception.GenericJDBCException: Could not open connectionat org.hibernate.exception.internal.StandardSQLExceptionConverter.convert(StandardSQLExceptionConverter.java:54)at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:126)at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:112)at org.hibernate.engine.jdbc.internal.LogicalConnectionImpl.obtainConnection(LogicalConnectionImpl.java:235)at org.hibernate.engine.jdbc.internal.LogicalConnectionImpl.getConnection(LogicalConnectionImpl.java:171)at org.hibernate.engine.jdbc.internal.StatementPreparerImpl.connection(StatementPreparerImpl.java:63)at org.hibernate.engine.jdbc.internal.StatementPreparerImpl$5.doPrepare(StatementPreparerImpl.java:162)at org.hibernate.engine.jdbc.internal.StatementPreparerImpl$StatementPreparationTemplate.prepareStatement(StatementPreparerImpl.java:186)at org.hibernate.engine.jdbc.internal.StatementPreparerImpl.prepareQueryStatement(StatementPreparerImpl.java:160)at org.hibernate.loader.Loader.prepareQueryStatement(Loader.java:1885)at org.hibernate.loader.Loader.executeQueryStatement(Loader.java:1862)at org.hibernate.loader.Loader.executeQueryStatement(Loader.java:1839)at org.hibernate.loader.Loader.doQuery(Loader.java:910)at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:355)at org.hibernate.loader.Loader.doList(Loader.java:2554)at org.hibernate.loader.Loader.doList(Loader.java:2540)at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2370)at org.hibernate.loader.Loader.list(Loader.java:2365)at org.hibernate.loader.custom.CustomLoader.list(CustomLoader.java:353)at org.hibernate.internal.SessionImpl.listCustomQuery(SessionImpl.java:1873)at org.hibernate.internal.AbstractSessionImpl.list(AbstractSessionImpl.java:311)at org.hibernate.internal.SQLQueryImpl.list(SQLQueryImpl.java:141)at com.bestsch.learn.dao.imp.ClassifyDAO.getSubClassify(ClassifyDAO.java:77)at com.bestsch.learn.dao.imp.ClassifyDAO$$FastClassBySpringCGLIB$$5e4fdb3f.invoke(<generated>)at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204)at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:649)at com.bestsch.learn.dao.imp.ClassifyDAO$$EnhancerBySpringCGLIB$$70b5597c.getSubClassify(<generated>)at com.bestsch.learn.service.imp.ClassifyService.getSubClassify(ClassifyService.java:71)at com.bestsch.learn.service.imp.ClassifyService$$FastClassBySpringCGLIB$$a139c805.invoke(<generated>)at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204)at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:649)at com.bestsch.learn.service.imp.ClassifyService$$EnhancerBySpringCGLIB$$af81e382.getSubClassify(<generated>)at com.bestsch.learn.servlet.api2.sys.GetNextClassify.doGet(GetNextClassify.java:34)at com.bestsch.learn.servlet.BaseServlet2.doGet(BaseServlet2.java:63)at javax.servlet.http.HttpServlet.service(HttpServlet.java:634)at javax.servlet.http.HttpServlet.service(HttpServlet.java:741)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)at com.bestsch.learn.filter.CharacterEncodingFilter.doFilter(CharacterEncodingFilter.java:33)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)at com.bestsch.learn.filter.CORSFilter.doFilter(CORSFilter.java:27)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:200)at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:490)at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139)at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:678)at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74)at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:408)at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:836)at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1747)at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)at java.base/java.lang.Thread.run(Thread.java:835)
Caused by: java.sql.SQLException: Connections could not be acquired from the underlying database!at com.mchange.v2.sql.SqlUtils.toSQLException(SqlUtils.java:106)at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutPooledConnection(C3P0PooledConnectionPool.java:677)at com.mchange.v2.c3p0.impl.AbstractPoolBackedDataSource.getConnection(AbstractPoolBackedDataSource.java:128)at org.hibernate.engine.jdbc.connections.internal.DatasourceConnectionProviderImpl.getConnection(DatasourceConnectionProviderImpl.java:139)at org.hibernate.internal.AbstractSessionImpl$NonContextualJdbcConnectionAccess.obtainConnection(AbstractSessionImpl.java:380)at org.hibernate.engine.jdbc.internal.LogicalConnectionImpl.obtainConnection(LogicalConnectionImpl.java:228)... 60 more
Caused by: com.mchange.v2.resourcepool.CannotAcquireResourceException: A ResourcePool could not acquire a resource from its primary factory or source.at com.mchange.v2.resourcepool.BasicResourcePool.awaitAvailable(BasicResourcePool.java:1406)at com.mchange.v2.resourcepool.BasicResourcePool.prelimCheckoutResource(BasicResourcePool.java:594)at com.mchange.v2.resourcepool.BasicResourcePool.checkoutResource(BasicResourcePool.java:514)at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutAndMarkConnectionInUse(C3P0PooledConnectionPool.java:743)at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutPooledConnection(C3P0PooledConnectionPool.java:670)... 64 more

网上的解决办法

1、驱动配置有误：driver=com.mysql.jdbc.Driver
2、数据库连接地址有误：url=jdbc:mysql://localhost:3306/test?3useUnicode=true&characterEncoding=utf8
3、密码或帐号有误：username=root
password=root

4、数据库未启动或无权访问

5、项目未引入对应的驱动jar包

6、mysql root没有远程访问的权限，需要增加权限，增加权限的步骤如下：
进入mysql数据库：
grant all privileges on . to ‘root’@’%’ identified by ‘root’ with grant option;
flush privileges;

我的错误解决

项目中有两个mysql驱动，一个是mysql5.7的，一个是mysql8的，这两个驱动有冲突，删除5.7的驱动就可以了附上我的配置：

<bean id="dataSourceMain" class="com.mchange.v2.c3p0.ComboPooledDataSource" destroy-method="close"><property name="driverClass" value="com.mysql.jdbc.Driver" /><property name="jdbcUrl"value="jdbc:mysql://localhost:3306/bsch_learn?useSSL=FALSE&amp;serverTimezone=UTC&amp;useUnicode=true&amp;characterEncoding=UTF-8&amp;allowPublicKeyRetrieval=true" /><property name="user" value="root" /><property name="password" value="dcc1234" /><property name="maxPoolSize" value="30" /><property name="minPoolSize" value="30" /><property name="initialPoolSize" value="30" /><property name="maxIdleTime" value="20" /></bean>

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Hibernate 错误记录Connections could not be acquired from the underlying database!

Hibernate 错误记录Connections could not be acquired from the underlying database!

错误详情

网上的解决办法

我的错误解决

Hibernate 错误记录Connections could not be acquired from the underlying database!相关推荐

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