休眠 - org.hibernate.exception.GenericJDBCException：无法打开连接

为了解决对DB和空闲连接连接过多的问题，我们做了如下修改配置文件 -休眠 - org.hibernate.exception.GenericJDBCException：无法打开连接

c3p0.min_size=1 
c3p0.max_size=20 
c3p0.timeout=1800 
c3p0.max_statements=50 
connection.release_mode=on_close

后在尝试运行应用程序时，我们得到以下异常。请指点为什么发生这种情况&这可怎么修正 -

HTTP Status 500 - org.hibernate.exception.GenericJDBCException: Cannot open connection

类型异常报告

message org.hibernate.exception.GenericJDBCException: Cannot open connection 

description The server encountered an internal error that prevented it from fulfilling this request. 

exception 

javax.servlet.ServletException: org.hibernate.exception.GenericJDBCException: Cannot open connection 
    org.apache.struts.chain.ComposableRequestProcessor.process(ComposableRequestProcessor.java:286) 
    org.apache.struts.action.ActionServlet.process(ActionServlet.java:1913) 
    org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:462) 
    javax.servlet.http.HttpServlet.service(HttpServlet.java:637) 
    javax.servlet.http.HttpServlet.service(HttpServlet.java:717) 
    com.alci.filters.ParamFilter.doFilter(ParamFilter.java:27) 
root cause 

org.hibernate.exception.GenericJDBCException: Cannot open connection 
    org.hibernate.exception.SQLStateConverter.handledNonSpecificException(SQLStateConverter.java:126) 
    org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:114) 
    org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:66) 
    org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:52) 
    org.hibernate.jdbc.ConnectionManager.openConnection(ConnectionManager.java:449) 
    org.hibernate.jdbc.ConnectionManager.getConnection(ConnectionManager.java:167) 
    org.hibernate.jdbc.AbstractBatcher.prepareQueryStatement(AbstractBatcher.java:161) 
    org.hibernate.loader.Loader.prepareQueryStatement(Loader.java:1577) 
    org.hibernate.loader.Loader.doQuery(Loader.java:696) 
    org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:259) 
    org.hibernate.loader.Loader.doList(Loader.java:2232) 
    org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2129) 
    org.hibernate.loader.Loader.list(Loader.java:2124) 
    org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:401) 
    org.hibernate.hql.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:363) 
    org.hibernate.engine.query.HQLQueryPlan.performList(HQLQueryPlan.java:196) 
    org.hibernate.impl.SessionImpl.list(SessionImpl.java:1149) 
    org.hibernate.impl.QueryImpl.list(QueryImpl.java:102) 
    com.alci.common.LoginAction.login(LoginAction.java:127) 
    sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
    sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) 
    sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) 
    java.lang.reflect.Method.invoke(Method.java:597) 
    org.apache.struts.actions.DispatchAction.dispatchMethod(DispatchAction.java:269) 
    org.apache.struts.actions.DispatchAction.execute(DispatchAction.java:170) 
    org.apache.struts.chain.commands.servlet.ExecuteAction.execute(ExecuteAction.java:58) 
    org.apache.struts.chain.commands.AbstractExecuteAction.execute(AbstractExecuteAction.java:67) 
    org.apache.struts.chain.commands.ActionCommandBase.execute(ActionCommandBase.java:51) 
    org.apache.commons.chain.impl.ChainBase.execute(ChainBase.java:190) 
    org.apache.commons.chain.generic.LookupCommand.execute(LookupCommand.java:304) 
    org.apache.commons.chain.impl.ChainBase.execute(ChainBase.java:190) 
    org.apache.struts.chain.ComposableRequestProcessor.process(ComposableRequestProcessor.java:283) 
    org.apache.struts.action.ActionServlet.process(ActionServlet.java:1913) 
    org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:462) 
    javax.servlet.http.HttpServlet.service(HttpServlet.java:637) 
    javax.servlet.http.HttpServlet.service(HttpServlet.java:717) 
    com.alci.filters.ParamFilter.doFilter(ParamFilter.java:27) 
root cause 

java.sql.SQLException: Connections could not be acquired from the underlying database! 
    com.mchange.v2.sql.SqlUtils.toSQLException(SqlUtils.java:106) 
    com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutPooledConnection(C3P0PooledConnectionPool.java:529) 
    com.mchange.v2.c3p0.impl.AbstractPoolBackedDataSource.getConnection(AbstractPoolBackedDataSource.java:128) 
    org.hibernate.connection.C3P0ConnectionProvider.getConnection(C3P0ConnectionProvider.java:78) 
    org.hibernate.jdbc.ConnectionManager.openConnection(ConnectionManager.java:446) 
    org.hibernate.jdbc.ConnectionManager.getConnection(ConnectionManager.java:167) 
    org.hibernate.jdbc.AbstractBatcher.prepareQueryStatement(AbstractBatcher.java:161) 
    org.hibernate.loader.Loader.prepareQueryStatement(Loader.java:1577) 
    org.hibernate.loader.Loader.doQuery(Loader.java:696) 
    org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:259) 
    org.hibernate.loader.Loader.doList(Loader.java:2232) 
    org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2129) 
    org.hibernate.loader.Loader.list(Loader.java:2124) 
    org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:401) 
    org.hibernate.hql.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:363) 
    org.hibernate.engine.query.HQLQueryPlan.performList(HQLQueryPlan.java:196) 
    org.hibernate.impl.SessionImpl.list(SessionImpl.java:1149) 
    org.hibernate.impl.QueryImpl.list(QueryImpl.java:102) 
    com.alci.common.LoginAction.login(LoginAction.java:127) 
    sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
    sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) 
    sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) 
    java.lang.reflect.Method.invoke(Method.java:597) 
    org.apache.struts.actions.DispatchAction.dispatchMethod(DispatchAction.java:269) 
    org.apache.struts.actions.DispatchAction.execute(DispatchAction.java:170) 
    org.apache.struts.chain.commands.servlet.ExecuteAction.execute(ExecuteAction.java:58) 
    org.apache.struts.chain.commands.AbstractExecuteAction.execute(AbstractExecuteAction.java:67) 
    org.apache.struts.chain.commands.ActionCommandBase.execute(ActionCommandBase.java:51) 
    org.apache.commons.chain.impl.ChainBase.execute(ChainBase.java:190) 
    org.apache.commons.chain.generic.LookupCommand.execute(LookupCommand.java:304) 
    org.apache.commons.chain.impl.ChainBase.execute(ChainBase.java:190) 
    org.apache.struts.chain.ComposableRequestProcessor.process(ComposableRequestProcessor.java:283) 
    org.apache.struts.action.ActionServlet.process(ActionServlet.java:1913) 
    org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:462) 
    javax.servlet.http.HttpServlet.service(HttpServlet.java:637) 
    javax.servlet.http.HttpServlet.service(HttpServlet.java:717) 
    com.alci.filters.ParamFilter.doFilter(ParamFilter.java:27) 
root cause 

com.mchange.v2.resourcepool.CannotAcquireResourceException: A ResourcePool could not acquire a resource from its primary factory or source. 
    com.mchange.v2.resourcepool.BasicResourcePool.awaitAvailable(BasicResourcePool.java:1319) 
    com.mchange.v2.resourcepool.BasicResourcePool.prelimCheckoutResource(BasicResourcePool.java:557) 
    com.mchange.v2.resourcepool.BasicResourcePool.checkoutResource(BasicResourcePool.java:477) 
    com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutPooledConnection(C3P0PooledConnectionPool.java:525) 
    com.mchange.v2.c3p0.impl.AbstractPoolBackedDataSource.getConnection(AbstractPoolBackedDataSource.java:128) 
    org.hibernate.connection.C3P0ConnectionProvider.getConnection(C3P0ConnectionProvider.java:78) 
    org.hibernate.jdbc.ConnectionManager.openConnection(ConnectionManager.java:446) 
    org.hibernate.jdbc.ConnectionManager.getConnection(ConnectionManager.java:167) 
    org.hibernate.jdbc.AbstractBatcher.prepareQueryStatement(AbstractBatcher.java:161) 
    org.hibernate.loader.Loader.prepareQueryStatement(Loader.java:1577) 
    org.hibernate.loader.Loader.doQuery(Loader.java:696) 
    org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:259) 
    org.hibernate.loader.Loader.doList(Loader.java:2232) 
    org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2129) 
    org.hibernate.loader.Loader.list(Loader.java:2124) 
    org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:401) 
    org.hibernate.hql.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:363) 
    org.hibernate.engine.query.HQLQueryPlan.performList(HQLQueryPlan.java:196) 
    org.hibernate.impl.SessionImpl.list(SessionImpl.java:1149) 
    org.hibernate.impl.QueryImpl.list(QueryImpl.java:102) 
    com.alci.common.LoginAction.login(LoginAction.java:127) 
    sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
    sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) 
    sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) 
    java.lang.reflect.Method.invoke(Method.java:597) 
    org.apache.struts.actions.DispatchAction.dispatchMethod(DispatchAction.java:269) 
    org.apache.struts.actions.DispatchAction.execute(DispatchAction.java:170) 
    org.apache.struts.chain.commands.servlet.ExecuteAction.execute(ExecuteAction.java:58) 
    org.apache.struts.chain.commands.AbstractExecuteAction.execute(AbstractExecuteAction.java:67) 
    org.apache.struts.chain.commands.ActionCommandBase.execute(ActionCommandBase.java:51) 
    org.apache.commons.chain.impl.ChainBase.execute(ChainBase.java:190) 
    org.apache.commons.chain.generic.LookupCommand.execute(LookupCommand.java:304) 
    org.apache.commons.chain.impl.ChainBase.execute(ChainBase.java:190) 
    org.apache.struts.chain.ComposableRequestProcessor.process(ComposableRequestProcessor.java:283) 
    org.apache.struts.action.ActionServlet.process(ActionServlet.java:1913) 
    org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:462) 
    javax.servlet.http.HttpServlet.service(HttpServlet.java:637) 
    javax.servlet.http.HttpServlet.service(HttpServlet.java:717) 
    com.alci.filters.ParamFilter.doFilter(ParamFilter.java:27) 
note The full stack trace of the root cause is available in the Apache Tomcat/6.0.36 logs.

来源

2014-05-22 Suvo

你能发布根本原因的完整堆栈跟踪吗？ –

它是一个共享的tomcat;所以不能立即访问完整的堆栈跟踪。 – Suvo

你跑出来的数据库连接。

这意味着两件事情：

您的交易需要，因为查询速度慢的太多时间，所以连接被关押是为了太多的时间
你有非常高的流量需求无法满足成20个连接池大小。

我建议您阅读以下read my answer of this SO question。

I don't think this settings is recommended：

connection.release_mode=on_close

ON_CLOSE - 基本上是上述的传统问题。当Hibernate会话首次需要执行某个JDBC访问并持有该连接时，Hibernate会话将获得一个连接，直到会话关闭为。

on_close - 表示使用ConnectionReleaseMode.ON_CLOSE。此设置为左侧为向后兼容，但其使用非常不鼓励。

尝试使用“auto”代替。

来源

2014-05-22 13:12:31

这是一个测试环境，所以流量很少。另一方面，这种异常出现在登录，所以在登录时，缓慢的查询不是这种情况，我猜 – Suvo

在DEBUG上启用C3P0日志，以便您可以实际查看请求连接的数量以及它们释放的速度。 –

检查我的更新回应，我认为你不应该使用connection.release_mode = on_close选项。 –

休眠 - org.hibernate.exception.GenericJDBCException：无法打开连接

回答

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