scala.MatchError：在某个时间点

时间：2016-02-12 15:41:51

标签： java scala playframework playframework-2.4

我有一个相当大的Play Framework应用程序在生产中运行Play 2.4.3。我有几个实例，突然所有对服务器的请求都开始得到以下MatchError：

! @6p4o8d49h - Internal server error, for (GET) [/bookings/desk/suggest-products?term=&maxSize=50&page=1] ->
play.api.UnexpectedException: Unexpected exception[MatchError: null]
    at play.api.http.HttpErrorHandlerExceptions$.throwableToUsefulException(HttpErrorHandler.scala:261) ~[com.typesafe.play.play_2.11-2.4.3.jar:2.4.3]
    at play.api.http.HttpErrorHandlerExceptions.throwableToUsefulException(HttpErrorHandler.scala) ~[com.typesafe.play.play_2.11-2.4.3.jar:2.4.3]
    at play.http.DefaultHttpErrorHandler.throwableToUsefulException(DefaultHttpErrorHandler.java:169) ~[com.typesafe.play.play_2.11-2.4.3.jar:2.4.3]
    at play.http.DefaultHttpErrorHandler.onServerError(DefaultHttpErrorHandler.java:131) ~[com.typesafe.play.play_2.11-2.4.3.jar:2.4.3]
    at play.core.j.JavaHttpErrorHandlerAdapter$$anonfun$onServerError$1.apply(JavaHttpErrorHandlerAdapter.scala:22) [com.typesafe.play.play_2.11-2.4.3.jar:2.4.3]
    at play.core.j.JavaHttpErrorHandlerAdapter$$anonfun$onServerError$1.apply(JavaHttpErrorHandlerAdapter.scala:22) [com.typesafe.play.play_2.11-2.4.3.jar:2.4.3]
    at play.core.j.JavaHelpers$$anonfun$invokeWithContext$1.apply(JavaHelpers.scala:140) [com.typesafe.play.play_2.11-2.4.3.jar:2.4.3]
    at play.core.j.JavaHelpers$$anonfun$invokeWithContext$1.apply(JavaHelpers.scala:139) [com.typesafe.play.play_2.11-2.4.3.jar:2.4.3]
    at play.core.j.JavaHelpers$class.withContext(JavaHelpers.scala:151) [com.typesafe.play.play_2.11-2.4.3.jar:2.4.3]
    at play.core.j.JavaHelpers$.withContext(JavaHelpers.scala:160) [com.typesafe.play.play_2.11-2.4.3.jar:2.4.3]
    at play.core.j.JavaHelpers$class.invokeWithContext(JavaHelpers.scala:139) [com.typesafe.play.play_2.11-2.4.3.jar:2.4.3]
    at play.core.j.JavaHelpers$.invokeWithContext(JavaHelpers.scala:160) [com.typesafe.play.play_2.11-2.4.3.jar:2.4.3]
    at play.core.j.JavaHttpErrorHandlerAdapter.onServerError(JavaHttpErrorHandlerAdapter.scala:22) [com.typesafe.play.play_2.11-2.4.3.jar:2.4.3]
    at play.core.server.netty.PlayDefaultUpstreamHandler$$anonfun$9$$anonfun$apply$1.applyOrElse(PlayDefaultUpstreamHandler.scala:158) [com.typesafe.play.play-netty-server_2.11-2.4.3.jar:2.4.3]
    at play.core.server.netty.PlayDefaultUpstreamHandler$$anonfun$9$$anonfun$apply$1.applyOrElse(PlayDefaultUpstreamHandler.scala:155) [com.typesafe.play.play-netty-server_2.11-2.4.3.jar:2.4.3]
    at scala.runtime.AbstractPartialFunction.apply(AbstractPartialFunction.scala:36) [org.scala-lang.scala-library-2.11.7.jar:na]
    at scala.util.Failure$$anonfun$recover$1.apply(Try.scala:216) [org.scala-lang.scala-library-2.11.7.jar:na]
    at scala.util.Try$.apply(Try.scala:192) [org.scala-lang.scala-library-2.11.7.jar:na]
    at scala.util.Failure.recover(Try.scala:216) [org.scala-lang.scala-library-2.11.7.jar:na]
    at scala.concurrent.Future$$anonfun$recover$1.apply(Future.scala:324) [org.scala-lang.scala-library-2.11.7.jar:na]
    at scala.concurrent.Future$$anonfun$recover$1.apply(Future.scala:324) [org.scala-lang.scala-library-2.11.7.jar:na]
    at scala.concurrent.impl.CallbackRunnable.run(Promise.scala:32) [org.scala-lang.scala-library-2.11.7.jar:na]
    at play.api.libs.iteratee.Execution$trampoline$.executeScheduled(Execution.scala:109) [com.typesafe.play.play-iteratees_2.11-2.4.3.jar:2.4.3]
    at play.api.libs.iteratee.Execution$trampoline$.execute(Execution.scala:71) [com.typesafe.play.play-iteratees_2.11-2.4.3.jar:2.4.3]
    at scala.concurrent.impl.CallbackRunnable.executeWithValue(Promise.scala:40) [org.scala-lang.scala-library-2.11.7.jar:na]
    at scala.concurrent.impl.Promise$DefaultPromise.tryComplete(Promise.scala:248) [org.scala-lang.scala-library-2.11.7.jar:na]
    at scala.concurrent.Promise$class.complete(Promise.scala:55) [org.scala-lang.scala-library-2.11.7.jar:na]
    at scala.concurrent.impl.Promise$DefaultPromise.complete(Promise.scala:153) [org.scala-lang.scala-library-2.11.7.jar:na]
    at scala.concurrent.impl.Future$PromiseCompletingRunnable.run(Future.scala:23) [org.scala-lang.scala-library-2.11.7.jar:na]
    at akka.dispatch.TaskInvocation.run(AbstractDispatcher.scala:39) [com.typesafe.akka.akka-actor_2.11-2.4.0.jar:na]
    at akka.dispatch.ForkJoinExecutorConfigurator$AkkaForkJoinTask.exec(AbstractDispatcher.scala:399) [com.typesafe.akka.akka-actor_2.11-2.4.0.jar:na]
    at scala.concurrent.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260) [org.scala-lang.scala-library-2.11.7.jar:na]
    at scala.concurrent.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1339) [org.scala-lang.scala-library-2.11.7.jar:na]
    at scala.concurrent.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979) [org.scala-lang.scala-library-2.11.7.jar:na]
    at scala.concurrent.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107) [org.scala-lang.scala-library-2.11.7.jar:na]
Caused by: scala.MatchError: null
    at play.core.j.JavaAction.apply(JavaAction.scala:97) ~[com.typesafe.play.play_2.11-2.4.3.jar:2.4.3]
    at play.api.mvc.Action$$anonfun$apply$1$$anonfun$apply$4$$anonfun$apply$5.apply(Action.scala:105) ~[com.typesafe.play.play_2.11-2.4.3.jar:2.4.3]
    at play.api.mvc.Action$$anonfun$apply$1$$anonfun$apply$4$$anonfun$apply$5.apply(Action.scala:105) ~[com.typesafe.play.play_2.11-2.4.3.jar:2.4.3]
    at play.utils.Threads$.withContextClassLoader(Threads.scala:21) ~[com.typesafe.play.play_2.11-2.4.3.jar:2.4.3]
    at play.api.mvc.Action$$anonfun$apply$1$$anonfun$apply$4.apply(Action.scala:104) ~[com.typesafe.play.play_2.11-2.4.3.jar:2.4.3]
    at play.api.mvc.Action$$anonfun$apply$1$$anonfun$apply$4.apply(Action.scala:103) ~[com.typesafe.play.play_2.11-2.4.3.jar:2.4.3]
    at scala.Option.map(Option.scala:146) ~[org.scala-lang.scala-library-2.11.7.jar:na]
    at play.api.mvc.Action$$anonfun$apply$1.apply(Action.scala:103) ~[com.typesafe.play.play_2.11-2.4.3.jar:2.4.3]
    at play.api.mvc.Action$$anonfun$apply$1.apply(Action.scala:96) ~[com.typesafe.play.play_2.11-2.4.3.jar:2.4.3]
    at play.api.libs.iteratee.Iteratee$$anonfun$mapM$1.apply(Iteratee.scala:524) ~[com.typesafe.play.play-iteratees_2.11-2.4.3.jar:2.4.3]
    at play.api.libs.iteratee.Iteratee$$anonfun$mapM$1.apply(Iteratee.scala:524) ~[com.typesafe.play.play-iteratees_2.11-2.4.3.jar:2.4.3]
    at play.api.libs.iteratee.Iteratee$$anonfun$flatMapM$1.apply(Iteratee.scala:560) ~[com.typesafe.play.play-iteratees_2.11-2.4.3.jar:2.4.3]
    at play.api.libs.iteratee.Iteratee$$anonfun$flatMapM$1.apply(Iteratee.scala:560) ~[com.typesafe.play.play-iteratees_2.11-2.4.3.jar:2.4.3]
    at play.api.libs.iteratee.Iteratee$$anonfun$flatMap$1$$anonfun$apply$13.apply(Iteratee.scala:536) ~[com.typesafe.play.play-iteratees_2.11-2.4.3.jar:2.4.3]
    at play.api.libs.iteratee.Iteratee$$anonfun$flatMap$1$$anonfun$apply$13.apply(Iteratee.scala:536) ~[com.typesafe.play.play-iteratees_2.11-2.4.3.jar:2.4.3]
    at scala.concurrent.impl.Future$PromiseCompletingRunnable.liftedTree1$1(Future.scala:24) [org.scala-lang.scala-library-2.11.7.jar:na]
    at scala.concurrent.impl.Future$PromiseCompletingRunnable.run(Future.scala:24) [org.scala-lang.scala-library-2.11.7.jar:na]
    ... 6 common frames omitted

在第一个错误发生之前，日志看起来非常健康且正常，第一个例外是一些随机请求。在第一次发出此错误请求后，所有后续请求都会出现相同的错误，直到我们重新启动服务器。

从查看play.core.j.JavaAction.apply(JavaAction.scala:97)看起来错误意味着返回的Response对象都是null。

我查看了发生这种情况时堆空间使用情况的一些图表，并且内存使用量出现了大幅增长。我强烈怀疑MatchErrors隐藏了OutOfMemoryError（“Java堆空间”）错误。

有没有办法可以阻止scala.MatchError隐藏实际的OutOfMemoryError？

1 个答案:

答案 0 :(得分：1)

这是由堆已满并且Scala需要分配堆来进行模式匹配的组合引起的。

解决方法是修复导致OutOfMemoryException的任何内容，MatchError是一个红色的鲱鱼。这只是堆空间不足的副作用。

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