Java scala.MatchError：对于某个时间点之后的所有请求，都为null

我有一个相当大的Play框架应用程序，在生产环境中运行Play 2.4.3。我遇到过一些情况，突然所有对服务器的请求都出现以下匹配错误：

! @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和正常，第一个异常是一些随机请求。在第一个请求出现此错误后，所有后续请求都会收到相同的错误，直到我们重新启动服务器

从

play.core.j.JavaAction.apply（JavaAction.scala:97）

来看，错误似乎意味着返回的响应对象都是

null

我查看了发生这种情况时堆空间使用情况的一些图表，内存使用量出现了巨大的峰值。我强烈怀疑MatchErrors隐藏了OutOfMemoryError（“Java堆空间”）错误

---

有没有办法阻止scala.MatchError隐藏实际的OutOfMemoryError？

这是由于堆已满，scala需要分配堆来进行模式匹配

---

解决方案是修复导致OutOfMemoryException的任何原因，MatchError是一个麻烦。这只是堆空间不足的副作用。

看起来您的操作中有错误，但框架没有向您显示真正的问题。您是否实现了自己的错误处理程序？或者是的，我有自己的HttpErrorHandler实现。据我所知，它能够向跟踪系统发送这些错误的报告，并向用户显示一个错误页面，用户可以在其中向我们的支持系统报告错误。是否可以在错误处理程序中创建匹配错误？这可能会隐藏原始错误。如果您遇到内存泄漏，我只能建议您在测试服务器中对应用程序施加压力，并删除此服务器中的错误处理程序。另一种选择是在用户无法访问的情况下，在出现故障的生产服务器上进行远程调试。有什么后续行动吗？您是否找到了问题的根源？MatchError只是由于JVM无法分配内存进行匹配而导致的。我最终所做的是改变导致OOME正确释放内存的部分。据我所知，当堆空间填满时，play仍然存在运行到MatchError的问题。感谢发布此消息。您是如何克服隐藏OOME的框架的？我没有自定义的错误处理程序，但是堆栈的这一部分丢失了。为了澄清，我根本没有设法克服隐藏OOME的框架。我刚刚了解到匹配错误只是它前面的OOME的副作用。