弹簧或休眠连接泄漏

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我在webapp上使用spring with hibernate（hibernate-core-4.3.8.Final和spring 3.2.11.RELEASE）。我使用hikaricp（v 2.2.5）作为连接池impl，它检测连接泄漏并打印下面的堆栈跟踪。我使用spring的声明式事务划分，所以我假设管理和清理资源是由spring / hibernate完成的。因此，我认为spring或hibernate是检测到连接泄漏的原因。

基本上，有一个计时器，当它被触发时，调用一个标有@Transactional注释的spring bean。

 @Transactional public class InvoiceCycleExporter {
public runExportInvoiceCycleJob(){
  //this method when called is **sometimes** leaking a connection ....
} }

能帮我跟踪连接泄漏的来源吗？

我的appcontext.xml配置数据源，连接池，entitymanager如下

 <bean id="hikariConfig" class="com.zaxxer.hikari.HikariConfig">
    <property name="jdbcUrl" value="${jdbc.url}"/>
    <property name="username" value="${jdbc.user}"/>
    <property name="password" value="${jdbc.password}"/>
    <property name="maximumPoolSize" value="${jdbc.maximumPoolSize}"/>
    <property name="driverClassName" value="org.postgresql.Driver"/>
    <property name="leakDetectionThreshold" value="${jdbc.leakDetectionThreshold}"/>
</bean>

<bean id="dataSource" class="com.zaxxer.hikari.HikariDataSource" destroy-method="shutdown">
    <constructor-arg ref="hikariConfig"/>
</bean>

<bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">        
    <property name="dataSource" ref="dataSource"/>
    <property name="persistenceUnitName" value="velosPU"/>
    <property name="persistenceXmlLocation" value="classpath:META-INF/persistence.xml"/>       //more stuff ....   
 </bean>

堆栈跟踪如下：

2015-01-13 14:25:00.123 [Hikari Housekeeping Timer (pool HikariPool-0)] WARN  com.zaxxer.hikari.util.LeakTask - Connection leak detection triggered, stack trace follows
java.lang.Exception: null
        at org.hibernate.engine.jdbc.connections.internal.DatasourceConnectionProviderImpl.getConnection(DatasourceConnectionProviderImpl.java:139) ~[hibernate-core-4.3.8.Final.jar:4.3.8.Final]
        at org.hibernate.internal.AbstractSessionImpl$NonContextualJdbcConnectionAccess.obtainConnection(AbstractSessionImpl.java:380) ~[hibernate-core-4.3.8.Final.jar:4.3.8.Final]
        at org.hibernate.engine.jdbc.internal.LogicalConnectionImpl.obtainConnection(LogicalConnectionImpl.java:228) ~[hibernate-core-4.3.8.Final.jar:4.3.8.Final]
        at org.hibernate.engine.jdbc.internal.LogicalConnectionImpl.getConnection(LogicalConnectionImpl.java:171) ~[hibernate-core-4.3.8.Final.jar:4.3.8.Final]
        at org.hibernate.engine.transaction.internal.jdbc.JdbcTransaction.doBegin(JdbcTransaction.java:67) ~[hibernate-core-4.3.8.Final.jar:4.3.8.Final]
        at org.hibernate.engine.transaction.spi.AbstractTransactionImpl.begin(AbstractTransactionImpl.java:162) ~[hibernate-core-4.3.8.Final.jar:4.3.8.Final]
        at org.hibernate.internal.SessionImpl.beginTransaction(SessionImpl.java:1435) ~[hibernate-core-4.3.8.Final.jar:4.3.8.Final]
        at org.hibernate.jpa.internal.TransactionImpl.begin(TransactionImpl.java:61) ~[hibernate-entitymanager-4.3.8.Final.jar:4.3.8.Final]
        at org.springframework.orm.jpa.DefaultJpaDialect.beginTransaction(DefaultJpaDialect.java:70) ~[spring-orm-3.2.11.RELEASE.jar:3.2.11.RELEASE]
        at org.springframework.orm.jpa.vendor.HibernateJpaDialect.beginTransaction(HibernateJpaDialect.java:61) ~[spring-orm-3.2.11.RELEASE.jar:3.2.11.RELEASE]
        at org.springframework.orm.jpa.JpaTransactionManager.doBegin(JpaTransactionManager.java:378) ~[spring-orm-3.2.11.RELEASE.jar:3.2.11.RELEASE]
        at org.springframework.transaction.support.AbstractPlatformTransactionManager.getTransaction(AbstractPlatformTransactionManager.java:372) ~[spring-tx-3.2.11.RELEASE.jar:3.2.11.RELEASE]
        at org.springframework.transaction.interceptor.TransactionAspectSupport.createTransactionIfNecessary(TransactionAspectSupport.java:417) ~[spring-tx-3.2.11.RELEASE.jar:3.2.11.RELEASE]
        at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:255) ~[spring-tx-3.2.11.RELEASE.jar:3.2.11.RELEASE]
        at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:94) ~[spring-tx-3.2.11.RELEASE.jar:3.2.11.RELEASE]
        at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172) ~[spring-aop-3.2.11.RELEASE.jar:3.2.11.RELEASE]
        at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:633) ~[spring-aop-3.2.11.RELEASE.jar:3.2.11.RELEASE]
        at com.ukfuels.velos.services.bl.internalinterface.impl.bl.invoicing.**InvoiceCycleExporter (this is the spring bean marked with the transactional annotation)**$$EnhancerBySpringCGLIB$$519c078f.runExportInvoiceCycleJob(<generated>) ~[spring-core-3.2.11.RELEASE.jar:na]
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.7.0_65]
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) ~[na:1.7.0_65]
        at org.apache.camel.component.bean.BeanProcessor.process(BeanProcessor.java:67) ~[camel-core-2.11.4.jar:2.11.4]
        at org.apache.camel.impl.ProcessorEndpoint.onExchange(ProcessorEndpoint.java:103) ~[camel-core-2.11.4.jar:2.11.4]
        at org.apache.camel.impl.ProcessorEndpoint$1.process(ProcessorEndpoint.java:71) ~[camel-core-2.11.4.jar:2.11.4]
        at org.apache.camel.util.AsyncProcessorConverterHelper$ProcessorToAsyncProcessorBridge.process(AsyncProcessorConverterHelper.java:61) ~[camel-core-2.11.4.jar:2.11.4]
        at org.apache.camel.util.AsyncProcessorHelper.process(AsyncProcessorHelper.java:73) ~[camel-core-2.11.4.jar:2.11.4]
        at org.apache.camel.processor.SendProcessor$2.doInAsyncProducer(SendProcessor.java:122) ~[camel-core-2.11.4.jar:2.11.4]
        at org.apache.camel.impl.ProducerCache.doInAsyncProducer(ProducerCache.java:298) ~[camel-core-2.11.4.jar:2.11.4]
        at org.apache.camel.processor.SendProcessor.process(SendProcessor.java:117) ~[camel-core-2.11.4.jar:2.11.4]
        at org.apache.camel.util.AsyncProcessorHelper.process(AsyncProcessorHelper.java:73) ~[camel-core-2.11.4.jar:2.11.4]
        at org.apache.camel.processor.DelegateAsyncProcessor.processNext(DelegateAsyncProcessor.java:99) ~[camel-core-2.11.4.jar:2.11.4]
        at org.apache.camel.processor.DelegateAsyncProcessor.process(DelegateAsyncProcessor.java:90) ~[camel-core-2.11.4.jar:2.11.4]
        at org.apache.camel.management.InstrumentationProcessor.process(InstrumentationProcessor.java:72) ~[camel-core-2.11.4.jar:2.11.4]
        at org.apache.camel.util.AsyncProcessorHelper.process(AsyncProcessorHelper.java:73) ~[camel-core-2.11.4.jar:2.11.4]
        at org.apache.camel.processor.DelegateAsyncProcessor.processNext(DelegateAsyncProcessor.java:99) ~[camel-core-2.11.4.jar:2.11.4]
        at org.apache.camel.processor.DelegateAsyncProcessor.process(DelegateAsyncProcessor.java:90) ~[camel-core-2.11.4.jar:2.11.4]
        at org.apache.camel.processor.interceptor.BacklogTracerInterceptor.process(BacklogTracerInterceptor.java:84) ~[camel-core-2.11.4.jar:2.11.4]
        at org.apache.camel.util.AsyncProcessorHelper.process(AsyncProcessorHelper.java:73) ~[camel-core-2.11.4.jar:2.11.4]
        at org.apache.camel.processor.DelegateAsyncProcessor.processNext(DelegateAsyncProcessor.java:99) ~[camel-core-2.11.4.jar:2.11.4]
        at org.apache.camel.processor.DelegateAsyncProcessor.process(DelegateAsyncProcessor.java:90) ~[camel-core-2.11.4.jar:2.11.4]
        at org.apache.camel.processor.interceptor.TraceInterceptor.process(TraceInterceptor.java:91) ~[camel-core-2.11.4.jar:2.11.4]
        at org.apache.camel.util.AsyncProcessorHelper.process(AsyncProcessorHelper.java:73) ~[camel-core-2.11.4.jar:2.11.4]
        at org.apache.camel.processor.RedeliveryErrorHandler.processErrorHandler(RedeliveryErrorHandler.java:391) ~[camel-core-2.11.4.jar:2.11.4]
        at org.apache.camel.processor.RedeliveryErrorHandler.process(RedeliveryErrorHandler.java:273) ~[camel-core-2.11.4.jar:2.11.4]
        at org.apache.camel.processor.RouteContextProcessor.processNext(RouteContextProcessor.java:46) ~[camel-core-2.11.4.jar:2.11.4]
        at org.apache.camel.processor.DelegateAsyncProcessor.process(DelegateAsyncProcessor.java:90) ~[camel-core-2.11.4.jar:2.11.4]
        at org.apache.camel.processor.interceptor.DefaultChannel.process(DefaultChannel.java:335) ~[camel-core-2.11.4.jar:2.11.4]
        at org.apache.camel.processor.RouteContextProcessor.processNext(RouteContextProcessor.java:46) ~[camel-core-2.11.4.jar:2.11.4]
        at org.apache.camel.processor.DelegateAsyncProcessor.process(DelegateAsyncProcessor.java:90) ~[camel-core-2.11.4.jar:2.11.4]
        at org.apache.camel.processor.UnitOfWorkProcessor.processAsync(UnitOfWorkProcessor.java:150) ~[camel-core-2.11.4.jar:2.11.4]
        at org.apache.camel.processor.UnitOfWorkProcessor.process(UnitOfWorkProcessor.java:117) ~[camel-core-2.11.4.jar:2.11.4]
        at org.apache.camel.processor.RouteInflightRepositoryProcessor.processNext(RouteInflightRepositoryProcessor.java:48) ~[camel-core-2.11.4.jar:2.11.4]
        at org.apache.camel.processor.DelegateAsyncProcessor.process(DelegateAsyncProcessor.java:90) ~[camel-core-2.11.4.jar:2.11.4]
        at org.apache.camel.util.AsyncProcessorHelper.process(AsyncProcessorHelper.java:73) ~[camel-core-2.11.4.jar:2.11.4]
        at org.apache.camel.processor.DelegateAsyncProcessor.processNext(DelegateAsyncProcessor.java:99) ~[camel-core-2.11.4.jar:2.11.4]
        at org.apache.camel.processor.DelegateAsyncProcessor.process(DelegateAsyncProcessor.java:90) ~[camel-core-2.11.4.jar:2.11.4]
        at org.apache.camel.management.InstrumentationProcessor.process(InstrumentationProcessor.java:72) ~[camel-core-2.11.4.jar:2.11.4]
        at org.apache.camel.util.AsyncProcessorHelper.process(AsyncProcessorHelper.java:73) ~[camel-core-2.11.4.jar:2.11.4]
        at org.apache.camel.processor.loadbalancer.QueueLoadBalancer.process(QueueLoadBalancer.java:44) ~[camel-core-2.11.4.jar:2.11.4]
        at org.apache.camel.util.AsyncProcessorHelper.process(AsyncProcessorHelper.java:99) ~[camel-core-2.11.4.jar:2.11.4]
        at org.apache.camel.processor.loadbalancer.QueueLoadBalancer.process(QueueLoadBalancer.java:71) ~[camel-core-2.11.4.jar:2.11.4]
        at org.apache.camel.component.quartz.QuartzEndpoint.onJobExecute(QuartzEndpoint.java:113) ~[camel-quartz-2.11.4.jar:2.11.4]
        at org.apache.camel.component.quartz.CamelJob.execute(CamelJob.java:61) ~[camel-quartz-2.11.4.jar:2.11.4]
        at org.quartz.core.JobRunShell.run(JobRunShell.java:223) ~[quartz-1.8.6.jar:na]
        at org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:549) ~[quartz-1.8.6.jar:na] **(a timer is triggered)**
答案

这里讨论的问题很多：

https://github.com/brettwooldridge/HikariCP/issues/34

缩小问题范围：

  1. 尝试使用Hibernate 4的Spring 4
  2. 尝试其他数据源以查看问题是否仍然存在。
另一答案

这里有一些我认为可能对调试连接泄漏有用的信息

  • 排除误报。例如，如果您的事务可能会运行5分钟（例如，在生成大型报告时）并且您已将“leakDetectionThreshold”参数（或所选池实现的等效参数）设置为4分钟，那么超过4分钟的交易将被报告为泄漏，即使它可能不是真正的泄漏（交易可以优雅地完成并在5分钟后充分释放所有连接）。
  • 如果您正在使用连接池，但偶尔会发现自己的连接不足，那么请考虑如何配置池。就我而言，我已经使用'maximumPoolSize'= 100配置了池。 Hikari将自动默认'minimumIdle'配置（HikariCP尝试在池中维护的最小空闲连接数）与'maximumPoolSize'相同，因此在启动时，池将初始化为所有最多100个连接。但这意味着当'maxLifetime'（池中连接的最大生命周期）触发时，所有连接都必须同时更新。这导致可用连接的急剧临时减少。在我的日志中，我偶尔会看到以下行。 HikariPool-0（总数= 100，inUse = 0，avail = 100，waiting = 0） HikariPool-0（总数= 4，inUse = 0，avail = 4，waiting = 0） HikariPool-0（总数= 100，inUse = 0，avail = 100，waiting = 0） 可用连接仅下降到4的第二行是达到'maxLifetime'并且连接需要更新时。因此，在配置池时，请以某种方式执行此操作，以使连接在不同时间到期。在我的例子中，我只是将'minimumIdle'更改为40，这意味着当服务器上的负载增加时，将逐步获取新连接（观察您的池impl是否提供相当于minToAcquire属性），因此这些连接将具有不同的到期日期。
  • 您的连接'maxLifetime'需要小于数据库为连接分配/期望的连接，这样您才不会在池中找到无效的连接。更新：一些数据库可能会在一段时间后强制断开连接。例如，postgres有一个'connectionTimeout'和'socketTimeout'选项。因此，在应用程序的连接池中，您不希望将连接保持的时间超过此db-enforced-connection-timeout，否则您将保持无效/已删除的连接。

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