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Apache Cayenne / PostgreSQL：“已有太多客户端”错误

[英]Apache Cayenne / PostgreSQL: “too many clients already” error

 原文  2017-04-03 15:28:10  8   1    java/ postgresql/ apache-cayenne

问题描述

I'm using Apache Cayenne 4 Milestone 5 and I'm getting this error. 我正在使用Apache Cayenne 4 Milestone 5，但出现此错误。 The application is not officially deployed but it is being tested within the IntelliJ IDEA. 该应用程序尚未正式部署，但正在IntelliJ IDEA中进行测试。 

Apr 03, 2017 10:19:58 PM org.postgresql.Driver connect
SEVERE: Connection error: 
org.postgresql.util.PSQLException: FATAL: sorry, too many clients already
    at org.postgresql.core.v3.ConnectionFactoryImpl.doAuthentication(ConnectionFactoryImpl.java:438)
    at org.postgresql.core.v3.ConnectionFactoryImpl.openConnectionImpl(ConnectionFactoryImpl.java:222)
    at org.postgresql.core.ConnectionFactory.openConnection(ConnectionFactory.java:49)
    at org.postgresql.jdbc.PgConnection.<init>(PgConnection.java:194)
    at org.postgresql.Driver.makeConnection(Driver.java:431)
    at org.postgresql.Driver.connect(Driver.java:247)
    at org.apache.cayenne.datasource.DriverDataSource.getConnection(DriverDataSource.java:159)
    at org.apache.cayenne.datasource.DriverDataSource.getConnection(DriverDataSource.java:133)
    at org.apache.cayenne.datasource.UnmanagedPoolingDataSource.createUnwrapped(UnmanagedPoolingDataSource.java:300)
    at org.apache.cayenne.datasource.UnmanagedPoolingDataSource.createWrapped(UnmanagedPoolingDataSource.java:293)
    at org.apache.cayenne.datasource.UnmanagedPoolingDataSource.createUnchecked(UnmanagedPoolingDataSource.java:273)
    at org.apache.cayenne.datasource.UnmanagedPoolingDataSource.<init>(UnmanagedPoolingDataSource.java:142)
    at org.apache.cayenne.datasource.PoolingDataSourceBuilder.buildPooling(PoolingDataSourceBuilder.java:92)
    at org.apache.cayenne.datasource.PoolingDataSourceBuilder.build(PoolingDataSourceBuilder.java:88)
    at org.apache.cayenne.configuration.server.XMLPoolingDataSourceFactory.getDataSource(XMLPoolingDataSourceFactory.java:75)
    at org.apache.cayenne.configuration.server.DelegatingDataSourceFactory.getDataSource(DelegatingDataSourceFactory.java:68)
    at org.apache.cayenne.configuration.server.DefaultDataNodeFactory.createDataNode(DefaultDataNodeFactory.java:79)
    at org.apache.cayenne.configuration.server.DataDomainProvider.addDataNode(DataDomainProvider.java:175)
    at org.apache.cayenne.configuration.server.DataDomainProvider.createAndInitDataDomain(DataDomainProvider.java:127)
    at org.apache.cayenne.configuration.server.DataDomainProvider.get(DataDomainProvider.java:91)
    at org.apache.cayenne.configuration.server.DataDomainProvider.get(DataDomainProvider.java:56)
    at org.apache.cayenne.di.spi.CustomProvidersProvider.get(CustomProvidersProvider.java:39)
    at org.apache.cayenne.di.spi.FieldInjectingProvider.get(FieldInjectingProvider.java:43)
    at org.apache.cayenne.di.spi.DefaultScopeProvider.get(DefaultScopeProvider.java:50)
    at org.apache.cayenne.di.spi.DefaultInjector.getInstance(DefaultInjector.java:139)
    at org.apache.cayenne.di.spi.FieldInjectingProvider.value(FieldInjectingProvider.java:105)
    at org.apache.cayenne.di.spi.FieldInjectingProvider.injectMember(FieldInjectingProvider.java:68)
    at org.apache.cayenne.di.spi.FieldInjectingProvider.injectMembers(FieldInjectingProvider.java:59)
    at org.apache.cayenne.di.spi.FieldInjectingProvider.get(FieldInjectingProvider.java:44)
    at org.apache.cayenne.di.spi.DefaultScopeProvider.get(DefaultScopeProvider.java:50)
    at org.apache.cayenne.di.spi.DefaultInjector.getInstance(DefaultInjector.java:134)
    at org.apache.cayenne.configuration.CayenneRuntime.newContext(CayenneRuntime.java:124)
    at com.company.databases.postgresql.accountsdb.dataservices.AccountServices.loginAsEmailAddress(AccountServices.java:454)
    at com.company.databases.postgresql.accountsdb.dataservices.AccountServices.login(AccountServices.java:445)
    at com.company.actions.fan.account.AccountActions.login(AccountActions.java:44)
    at com.company.serverapps.fans.entrypoints.standard.AccountConnections.login(AccountConnections.java:95)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.glassfish.jersey.server.model.internal.ResourceMethodInvocationHandlerFactory$1.invoke(ResourceMethodInvocationHandlerFactory.java:81)
    at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher$1.run(AbstractJavaResourceMethodDispatcher.java:144)
    at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.invoke(AbstractJavaResourceMethodDispatcher.java:161)
    at org.glassfish.jersey.server.model.internal.JavaResourceMethodDispatcherProvider$ResponseOutInvoker.doDispatch(JavaResourceMethodDispatcherProvider.java:160)
    at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.dispatch(AbstractJavaResourceMethodDispatcher.java:99)
    at org.glassfish.jersey.server.model.ResourceMethodInvoker.invoke(ResourceMethodInvoker.java:389)
    at org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:347)
    at org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:102)
    at org.glassfish.jersey.server.ServerRuntime$2.run(ServerRuntime.java:326)
    at org.glassfish.jersey.internal.Errors$1.call(Errors.java:271)
    at org.glassfish.jersey.internal.Errors$1.call(Errors.java:267)
    at org.glassfish.jersey.internal.Errors.process(Errors.java:315)
    at org.glassfish.jersey.internal.Errors.process(Errors.java:297)
    at org.glassfish.jersey.internal.Errors.process(Errors.java:267)
    at org.glassfish.jersey.process.internal.RequestScope.runInScope(RequestScope.java:317)
    at org.glassfish.jersey.server.ServerRuntime.process(ServerRuntime.java:305)
    at org.glassfish.jersey.server.ApplicationHandler.handle(ApplicationHandler.java:1154)
    at org.glassfish.jersey.servlet.WebComponent.serviceImpl(WebComponent.java:473)
    at org.glassfish.jersey.servlet.WebComponent.service(WebComponent.java:427)
    at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:388)
    at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:341)
    at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:228)
    at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:841)
    at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1634)
    at org.eclipse.jetty.servlets.CrossOriginFilter.handle(CrossOriginFilter.java:308)
    at org.eclipse.jetty.servlets.CrossOriginFilter.doFilter(CrossOriginFilter.java:262)
    at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1621)
    at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:541)
    at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:188)
    at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:1592)
    at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:188)
    at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1239)
    at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:168)
    at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:481)
    at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:1561)
    at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:166)
    at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1141)
    at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)
    at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:213)
    at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132)
    at org.eclipse.jetty.server.Server.handle(Server.java:564)
    at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:320)
    at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:251)
    at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:279)
    at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:110)
    at org.eclipse.jetty.io.ChannelEndPoint$2.run(ChannelEndPoint.java:124)
    at org.eclipse.jetty.util.thread.Invocable.invokePreferred(Invocable.java:122)
    at org.eclipse.jetty.util.thread.strategy.ExecutingExecutionStrategy.invoke(ExecutingExecutionStrategy.java:58)
    at org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume.produceConsume(ExecuteProduceConsume.java:201)
    at org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume.run(ExecuteProduceConsume.java:133)
    at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:672)
    at org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:590)
    at java.lang.Thread.run(Thread.java:745)

Apr 03, 2017 10:21:58 PM org.postgresql.Driver connect
SEVERE: Connection error: 
org.postgresql.util.PSQLException: FATAL: sorry, too many clients already
    at org.postgresql.core.v3.ConnectionFactoryImpl.doAuthentication(ConnectionFactoryImpl.java:438)
    at org.postgresql.core.v3.ConnectionFactoryImpl.openConnectionImpl(ConnectionFactoryImpl.java:222)
    at org.postgresql.core.ConnectionFactory.openConnection(ConnectionFactory.java:49)
    at org.postgresql.jdbc.PgConnection.<init>(PgConnection.java:194)
    at org.postgresql.Driver.makeConnection(Driver.java:431)
    at org.postgresql.Driver.connect(Driver.java:247)
    at org.apache.cayenne.datasource.DriverDataSource.getConnection(DriverDataSource.java:159)
    at org.apache.cayenne.datasource.DriverDataSource.getConnection(DriverDataSource.java:133)
    at org.apache.cayenne.datasource.UnmanagedPoolingDataSource.createUnwrapped(UnmanagedPoolingDataSource.java:300)
    at org.apache.cayenne.datasource.UnmanagedPoolingDataSource.createWrapped(UnmanagedPoolingDataSource.java:293)
    at org.apache.cayenne.datasource.UnmanagedPoolingDataSource.createUnchecked(UnmanagedPoolingDataSource.java:273)
    at org.apache.cayenne.datasource.UnmanagedPoolingDataSource.managePool(UnmanagedPoolingDataSource.java:188)
    at org.apache.cayenne.datasource.PoolingDataSourceManager.run(PoolingDataSourceManager.java:71)

The applicaion is working normally, but it shows this error after some usage. 该应用程序正常运行，但是使用一些后会显示此错误。 What is the cause of this error? 此错误的原因是什么？

I'm using the following method to obtain the runtime each time I need a transaction. 每当需要事务时，我就使用以下方法获取运行时。 

public final static ServerRuntime getAccountsDBPostgreSQLRuntime() {
        return ServerRuntime.builder().addConfig("cayenne/cayenne-AccountsDB.project.xml").build();
    }

Example: 例： 

public final static Long newFanAccount() {
        ServerRuntime accountsDBPostgresRuntime = AccountsDBRuntime.getAccountsDBPostgreSQLRuntime();
        ObjectContext context = accountsDBPostgresRuntime.newContext();
        Fan fan = context.newObject(Fan.class);
        context.commitChanges();
        Long fanID = (Long) Cayenne.pkForObject(fan);
        return fanID;
    }

1 个解决方案

解决方案1
 2 已采纳  2017-04-03 17:27:00

From the stack trace and the code example it looks like you are not reusing the Cayenne stack (ServerRuntime object), creating a new one every time instead. 从堆栈跟踪和代码示例中，您似乎并没有重用Cayenne堆栈（ServerRuntime对象），而是每次都创建一个新堆栈。 Aside from being slow, this also introduces a resource leak. 除了速度慢之外，这还导致资源泄漏。 Each ServerRuntime holds its own connection pool that you do not shut down. 每个ServerRuntime都有自己的连接池，您不会关闭它。 So sooner or later PostreSQL server is overflown with open connections. 因此，迟早的PostreSQL服务器会因打开的连接而溢出。

The solution is to turn ServerRuntime into an app-scoped singleton (eg make it a static var of AccountsDBRuntime), and reuse it whenever you need a new ObjectContext. 解决方案是将ServerRuntime变成应用程序范围内的单例（例如，使其成为AccountsDBRuntime的静态变量），并在需要新的ObjectContext时重用它。

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