我正在用 java 构建一个应用程序Play Framework 2.0.4。该应用程序部署在heroku使用cleardb数据库。
用户不断收到此偶尔的错误：
PlayException: Execution exception [[PersistenceException: java.sql.SQLException: Timed out waiting for a free available connection.]]
at play.core.ActionInvoker$$anonfun$receive$1.apply(Invoker.scala:134)
at play.core.ActionInvoker$$anonfun$receive$1.apply(Invoker.scala:115)
at akka.actor.Actor$class.apply(Actor.scala:318)
at play.core.ActionInvoker.apply(Invoker.scala:113)
at akka.actor.ActorCell.invoke(ActorCell.scala:626)
at akka.dispatch.Mailbox.processMailbox(Mailbox.scala:197)
at akka.dispatch.Mailbox.run(Mailbox.scala:179)
at akka.dispatch.ForkJoinExecutorConfigurator$MailboxExecutionTask.exec(AbstractDispatcher.scala:516)
at akka.jsr166y.ForkJoinTask.doExec(ForkJoinTask.java:259)
at akka.jsr166y.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:975)
at akka.jsr166y.ForkJoinPool.runWorker(ForkJoinPool.java:1479)
at akka.jsr166y.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:104)
Caused by: javax.persistence.PersistenceException: java.sql.SQLException: Timed out waiting for a free available connection.
at com.avaje.ebeaninternal.server.transaction.TransactionManager.createQueryTransaction(TransactionManager.java:356)
at com.avaje.ebeaninternal.server.core.DefaultServer.createQueryTransaction(DefaultServer.java:2021)
at com.avaje.ebeaninternal.server.core.OrmQueryRequest.initTransIfRequired(OrmQueryRequest.java:241)
at com.avaje.ebeaninternal.server.core.DefaultServer.findId(DefaultServer.java:1212)
at com.avaje.ebeaninternal.server.core.DefaultServer.find(DefaultServer.java:1118)
at com.avaje.ebeaninternal.server.core.DefaultServer.find(DefaultServer.java:1105)
at play.db.ebean.Model$Finder.byId(Model.java:237)
现在情况变得更糟，有时所有用户每次都会遇到相同的错误，直到我在heroku 中重新启动应用程序。
有任何帮助或提示来调试它吗？
我认为问题是一样的Heroku/Play/BoneCp 连接问题 https://stackoverflow.com/questions/15480506/heroku-play-bonecp-connection-issues/15500442#15500442
Heroku 30 秒后关闭连接。
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