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com.mchange.v2.async.ThreadPoolAsynchronousRunner$DeadlockDetector@390508 -- APP

    博客分类：
  • Java
javahibernatethreadc3p0mchange 
阅读更多
最近项目运行时总是出现这个警告，改过很多次数据库连接池配置也没弄好，现在终于解决了。之前出错的连接池配置:
<property name="minPoolSize" value="5" />
<property name="maxPoolSize" value="50" />
<property name="maxIdleTime" value="1800" />
<property name="acquireIncrement" value="2" />
<property name="maxStatements" value="0" />
<property name="initialPoolSize" value="10" />
<property name="idleConnectionTestPeriod" value="30" />
<property name="acquireRetryAttempts" value="30" />

出错信息： 
WARN - com.mchange.v2.async.ThreadPoolAsynchronousRunner$DeadlockDetector@390508 -- APPARENT DEADLOCK!!! Creating emergency threads for unassigned pending tasks!
WARN - com.mchange.v2.async.ThreadPoolAsynchronousRunner$DeadlockDetector@390508 -- APPARENT DEADLOCK!!! Complete Status: 
	Managed Threads: 3
	Active Threads: 3
	Active Tasks: 
		com.mchange.v2.resourcepool.BasicResourcePool$AsyncTestIdleResourceTask@1e5ed7b (com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread-#2)
		com.mchange.v2.resourcepool.BasicResourcePool$AsyncTestIdleResourceTask@4a4e31 (com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread-#0)
		com.mchange.v2.resourcepool.BasicResourcePool$AsyncTestIdleResourceTask@538cc2 (com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread-#1)
	Pending Tasks: 
		com.mchange.v2.resourcepool.BasicResourcePool$AsyncTestIdleResourceTask@13e2b4a
		com.mchange.v2.resourcepool.BasicResourcePool$AsyncTestIdleResourceTask@8c1852
Pool thread stack traces:
	Thread[com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread-#2,5,main]
		java.net.SocketInputStream.socketRead0(Native Method)
		java.net.SocketInputStream.read(SocketInputStream.java:129)
		java.io.DataInputStream.readFully(DataInputStream.java:178)
		java.io.DataInputStream.readFully(DataInputStream.java:152)
		net.sourceforge.jtds.jdbc.SharedSocket.readPacket(SharedSocket.java:826)
		net.sourceforge.jtds.jdbc.SharedSocket.getNetPacket(SharedSocket.java:707)
		net.sourceforge.jtds.jdbc.ResponseStream.getPacket(ResponseStream.java:466)
		net.sourceforge.jtds.jdbc.ResponseStream.read(ResponseStream.java:103)
		net.sourceforge.jtds.jdbc.ResponseStream.peek(ResponseStream.java:88)
		net.sourceforge.jtds.jdbc.TdsCore.wait(TdsCore.java:3870)
		net.sourceforge.jtds.jdbc.TdsCore.executeSQL(TdsCore.java:1042)
		net.sourceforge.jtds.jdbc.JtdsStatement.executeSQLQuery(JtdsStatement.java:406)
		net.sourceforge.jtds.jdbc.JtdsPreparedStatement.executeQuery(JtdsPreparedStatement.java:696)
		net.sourceforge.jtds.jdbc.JtdsDatabaseMetaData.getTables(JtdsDatabaseMetaData.java:1823)
		com.mchange.v2.c3p0.impl.DefaultConnectionTester.activeCheckConnectionNoQuery(DefaultConnectionTester.java:185)
		com.mchange.v2.c3p0.impl.DefaultConnectionTester.activeCheckConnection(DefaultConnectionTester.java:62)
		com.mchange.v2.c3p0.AbstractConnectionTester.activeCheckConnection(AbstractConnectionTester.java:67)
		com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool$1PooledConnectionResourcePoolManager.testPooledConnection(C3P0PooledConnectionPool.java:368)
		com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool$1PooledConnectionResourcePoolManager.refurbishIdleResource(C3P0PooledConnectionPool.java:310)
		com.mchange.v2.resourcepool.BasicResourcePool$AsyncTestIdleResourceTask.run(BasicResourcePool.java:1999)
		com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread.run(ThreadPoolAsynchronousRunner.java:547)
	Thread[com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread-#0,5,main]
		java.net.SocketInputStream.socketRead0(Native Method)
		java.net.SocketInputStream.read(SocketInputStream.java:129)
		java.io.DataInputStream.readFully(DataInputStream.java:178)
		java.io.DataInputStream.readFully(DataInputStream.java:152)
		net.sourceforge.jtds.jdbc.SharedSocket.readPacket(SharedSocket.java:826)
		net.sourceforge.jtds.jdbc.SharedSocket.getNetPacket(SharedSocket.java:707)
		net.sourceforge.jtds.jdbc.ResponseStream.getPacket(ResponseStream.java:466)
		net.sourceforge.jtds.jdbc.ResponseStream.read(ResponseStream.java:103)
		net.sourceforge.jtds.jdbc.ResponseStream.peek(ResponseStream.java:88)
		net.sourceforge.jtds.jdbc.TdsCore.wait(TdsCore.java:3870)
		net.sourceforge.jtds.jdbc.TdsCore.executeSQL(TdsCore.java:1042)
		net.sourceforge.jtds.jdbc.JtdsStatement.executeSQLQuery(JtdsStatement.java:406)
		net.sourceforge.jtds.jdbc.JtdsPreparedStatement.executeQuery(JtdsPreparedStatement.java:696)
		net.sourceforge.jtds.jdbc.JtdsDatabaseMetaData.getTables(JtdsDatabaseMetaData.java:1823)
		com.mchange.v2.c3p0.impl.DefaultConnectionTester.activeCheckConnectionNoQuery(DefaultConnectionTester.java:185)
		com.mchange.v2.c3p0.impl.DefaultConnectionTester.activeCheckConnection(DefaultConnectionTester.java:62)
		com.mchange.v2.c3p0.AbstractConnectionTester.activeCheckConnection(AbstractConnectionTester.java:67)
		com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool$1PooledConnectionResourcePoolManager.testPooledConnection(C3P0PooledConnectionPool.java:368)
		com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool$1PooledConnectionResourcePoolManager.refurbishIdleResource(C3P0PooledConnectionPool.java:310)
		com.mchange.v2.resourcepool.BasicResourcePool$AsyncTestIdleResourceTask.run(BasicResourcePool.java:1999)
		com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread.run(ThreadPoolAsynchronousRunner.java:547)
	Thread[com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread-#1,5,main]
		java.net.SocketInputStream.socketRead0(Native Method)
		java.net.SocketInputStream.read(SocketInputStream.java:129)
		java.io.DataInputStream.readFully(DataInputStream.java:178)
		java.io.DataInputStream.readFully(DataInputStream.java:152)
		net.sourceforge.jtds.jdbc.SharedSocket.readPacket(SharedSocket.java:826)
		net.sourceforge.jtds.jdbc.SharedSocket.getNetPacket(SharedSocket.java:707)
		net.sourceforge.jtds.jdbc.ResponseStream.getPacket(ResponseStream.java:466)
		net.sourceforge.jtds.jdbc.ResponseStream.read(ResponseStream.java:103)
		net.sourceforge.jtds.jdbc.ResponseStream.peek(ResponseStream.java:88)
		net.sourceforge.jtds.jdbc.TdsCore.wait(TdsCore.java:3870)
		net.sourceforge.jtds.jdbc.TdsCore.executeSQL(TdsCore.java:1042)
		net.sourceforge.jtds.jdbc.JtdsStatement.executeSQLQuery(JtdsStatement.java:406)
		net.sourceforge.jtds.jdbc.JtdsPreparedStatement.executeQuery(JtdsPreparedStatement.java:696)
		net.sourceforge.jtds.jdbc.JtdsDatabaseMetaData.getTables(JtdsDatabaseMetaData.java:1823)
		com.mchange.v2.c3p0.impl.DefaultConnectionTester.activeCheckConnectionNoQuery(DefaultConnectionTester.java:185)
		com.mchange.v2.c3p0.impl.DefaultConnectionTester.activeCheckConnection(DefaultConnectionTester.java:62)
		com.mchange.v2.c3p0.AbstractConnectionTester.activeCheckConnection(AbstractConnectionTester.java:67)
		com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool$1PooledConnectionResourcePoolManager.testPooledConnection(C3P0PooledConnectionPool.java:368)
		com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool$1PooledConnectionResourcePoolManager.refurbishIdleResource(C3P0PooledConnectionPool.java:310)
		com.mchange.v2.resourcepool.BasicResourcePool$AsyncTestIdleResourceTask.run(BasicResourcePool.java:1999)
		com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread.run(ThreadPoolAsynchronousRunner.java:547)

当连接池配置改为
<property name="minPoolSize" value="0" />
<property name="maxPoolSize" value="50" />
<property name="maxIdleTime" value="1800" />
<!-- 当连接池耗尽时候，一次获得连接数-->
<property name="acquireIncrement" value="5" />
<property name="maxStatements" value="0" />
<!-- 当连接池连接耗尽时，客户端getConnection(),所等待的时间-->
<property name="checkoutTimeout" value="20000"/>
<property name="idleConnectionTestPeriod" value="120" />
<!-- 当连接失效时，获得连接的次数，0为无限次（重连）-->
<property name="acquireRetryAttempts" value="30" />

新的出错信息： 
WARN - SQL Error: 0, SQLState: null
ERROR - An attempt by a client to checkout a Connection has timed out.
WARN - SQL Error: 0, SQLState: null
ERROR - An attempt by a client to checkout a Connection has timed out.
org.hibernate.exception.GenericJDBCException: Cannot open connection
	at org.hibernate.exception.SQLStateConverter.handledNonSpecificException(SQLStateConverter.java:103)
	at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:91)
	at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:43)
	at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:29)
	at org.hibernate.jdbc.ConnectionManager.openConnection(ConnectionManager.java:426)
	at org.hibernate.jdbc.ConnectionManager.getConnection(ConnectionManager.java:144)
	at org.hibernate.jdbc.AbstractBatcher.prepareQueryStatement(AbstractBatcher.java:139)
	at org.hibernate.loader.Loader.prepareQueryStatement(Loader.java:1547)
	at org.hibernate.loader.Loader.doQuery(Loader.java:673)
	at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:236)
	at org.hibernate.loader.Loader.doList(Loader.java:2220)
	at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2104)
	at org.hibernate.loader.Loader.list(Loader.java:2099)
	at org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:378)
	at org.hibernate.hql.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:338)
	at org.hibernate.engine.query.HQLQueryPlan.performList(HQLQueryPlan.java:172)
	at org.hibernate.impl.SessionImpl.list(SessionImpl.java:1121)
	at org.hibernate.impl.QueryImpl.list(QueryImpl.java:79)
	at org.hibernate.impl.AbstractQueryImpl.uniqueResult(AbstractQueryImpl.java:811)
	at com.chinanfs.nfp.systemManage.user.dao.impl.UserDaoImpl.queryObjectById(UserDaoImpl.java:489)
	at com.chinanfs.nfp.systemManage.user.service.impl.UserServiceImpl.queryObjectById(UserServiceImpl.java:347)
	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.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:310)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:182)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:149)
	at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:106)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
	at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:89)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
	at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)
	at $Proxy35.queryObjectById(Unknown Source)
	at com.chinanfs.nfp.systemManage.user.action.UserAction.queryObject(UserAction.java:377)
	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 com.opensymphony.xwork2.DefaultActionInvocation.invokeAction(DefaultActionInvocation.java:441)
	at com.opensymphony.xwork2.DefaultActionInvocation.invokeActionOnly(DefaultActionInvocation.java:280)
	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:243)
	at com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.java:165)
	at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:87)
	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
	at com.opensymphony.xwork2.validator.ValidationInterceptor.doIntercept(ValidationInterceptor.java:252)
	at org.apache.struts2.interceptor.validation.AnnotationValidationInterceptor.doIntercept(AnnotationValidationInterceptor.java:68)
	at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:87)
	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
	at com.opensymphony.xwork2.interceptor.ConversionErrorInterceptor.intercept(ConversionErrorInterceptor.java:122)
	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
	at com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:195)
	at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:87)
	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
	at com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:195)
	at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:87)
	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
	at com.opensymphony.xwork2.interceptor.StaticParametersInterceptor.intercept(StaticParametersInterceptor.java:179)
	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
	at org.apache.struts2.interceptor.MultiselectInterceptor.intercept(MultiselectInterceptor.java:75)
	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
	at org.apache.struts2.interceptor.CheckboxInterceptor.intercept(CheckboxInterceptor.java:94)
	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
	at org.apache.struts2.interceptor.FileUploadInterceptor.intercept(FileUploadInterceptor.java:235)
	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
	at com.opensymphony.xwork2.interceptor.ModelDrivenInterceptor.intercept(ModelDrivenInterceptor.java:89)
	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
	at com.opensymphony.xwork2.interceptor.ScopedModelDrivenInterceptor.intercept(ScopedModelDrivenInterceptor.java:130)
	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
	at org.apache.struts2.interceptor.debugging.DebuggingInterceptor.intercept(DebuggingInterceptor.java:267)
	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
	at com.opensymphony.xwork2.interceptor.ChainingInterceptor.intercept(ChainingInterceptor.java:126)
	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
	at com.opensymphony.xwork2.interceptor.PrepareInterceptor.doIntercept(PrepareInterceptor.java:138)
	at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:87)
	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
	at com.opensymphony.xwork2.interceptor.I18nInterceptor.intercept(I18nInterceptor.java:165)
	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
	at org.apache.struts2.interceptor.ServletConfigInterceptor.intercept(ServletConfigInterceptor.java:164)
	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
	at com.opensymphony.xwork2.interceptor.AliasInterceptor.intercept(AliasInterceptor.java:179)
	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
	at com.opensymphony.xwork2.interceptor.ExceptionMappingInterceptor.intercept(ExceptionMappingInterceptor.java:176)
	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
	at org.apache.struts2.impl.StrutsActionProxy.execute(StrutsActionProxy.java:52)
	at org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:488)
	at org.apache.struts2.dispatcher.ng.ExecuteOperations.executeAction(ExecuteOperations.java:77)
	at org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:91)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at org.springframework.orm.hibernate3.support.OpenSessionInViewFilter.doFilterInternal(OpenSessionInViewFilter.java:198)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:263)
	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
	at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:584)
	at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
	at java.lang.Thread.run(Thread.java:619)
Caused by: java.sql.SQLException: An attempt by a client to checkout a Connection has timed out.
	at com.mchange.v2.sql.SqlUtils.toSQLException(SqlUtils.java:106)
	at com.mchange.v2.sql.SqlUtils.toSQLException(SqlUtils.java:65)
	at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutPooledConnection(C3P0PooledConnectionPool.java:527)
	at com.mchange.v2.c3p0.impl.AbstractPoolBackedDataSource.getConnection(AbstractPoolBackedDataSource.java:128)
	at org.springframework.orm.hibernate3.LocalDataSourceConnectionProvider.getConnection(LocalDataSourceConnectionProvider.java:82)
	at org.hibernate.jdbc.ConnectionManager.openConnection(ConnectionManager.java:423)
	... 99 more
Caused by: com.mchange.v2.resourcepool.TimeoutException: A client timed out while waiting to acquire a resource from com.mchange.v2.resourcepool.BasicResourcePool@87b71b -- timeout at awaitAvailable()
	at com.mchange.v2.resourcepool.BasicResourcePool.awaitAvailable(BasicResourcePool.java:1317)
	at com.mchange.v2.resourcepool.BasicResourcePool.prelimCheckoutResource(BasicResourcePool.java:557)
	at com.mchange.v2.resourcepool.BasicResourcePool.checkoutResource(BasicResourcePool.java:477)
	at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutPooledConnection(C3P0PooledConnectionPool.java:525)
	... 102 more

问题已解决，配置为：
<property name="minPoolSize" value="0" />
<property name="maxPoolSize" value="15" />
<property name="maxIdleTime" value="1800" />
<!-- 当连接池耗尽时候，一次获得连接数-->
<property name="acquireIncrement" value="5" />
<property name="maxStatements" value="0" />
<!-- 当连接池连接耗尽时，客户端getConnection(),所等待的时间-->
<property name="idleConnectionTestPeriod" value="120" />
<!-- 当连接失效时，获得连接的次数，0为无限次（重连）-->
<property name="acquireRetryAttempts" value="30" />


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评论
2 楼 lihao 2012-01-30  
tae.kjava 写道
日天哥哥！
首先没有你这么提问题的， 在自己博客里提问题的。

http://www.iteye.com/topic/1117330

我是想先放着，等我自己解决来再发上来，你女未的。
1 楼 tae.kjava 2012-01-30  
日天哥哥！
首先没有你这么提问题的， 在自己博客里提问题的。

http://www.iteye.com/topic/1117330
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    mchange-commons-java-0.2.3.jar.zip

    mchange-commons-java.jar 各个版本，免费下载 mchange-commons-java.jar 是一个java 开发库， 提供许多常用的工具类和功能，包括数据库连接池、线程池、反射、集合操作等。

    mchange-commons-java-0.2.12.jar+c3p0-0.9.5.2.jar+c3p0-config.xml

    3. 在Java代码中，使用`com.mchange.v2.c3p0.ComboPooledDataSource`类实例化数据源，并加载配置文件。 4. 配置完成后，可以通过数据源获取和释放数据库连接，应用就可以利用C3P0的连接池功能了。 总结起来，C3P0是...

    mchange-commons-java-0.2.3.4.jar

    使用C3P0额外依赖的一个jar包 ：mchange-commons-java-0.2.3.4.jar

    mchange-commons-java-0.2.2-sources.jar.zip

    mchange-commons-java-sources.jar 源码，各个版本源码包。 mchange-commons-java.jar 是 c3p0 数据库连接池的辅助包。 没有这个包系统启动的时候会报classnotfoundexception， 这是c3p0-0.9.2版本后分离出来的包，...

    mchange-commons-java-0.2.15.jar

    c3p0依赖包mchange-commons-java-0.2.15.jar； 特别说明：c3p0（c3p0-0.9.5.3.bin.zip）的lib包里面含此mchange-commons-java-0.2.15.jar文件。

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