如何防止 java.lang.OutOfMemoryError: PermGen space？ [复制]

Question

我经常收到来自 SBT 的OutOfMemoryError。

> test
[error] java.util.concurrent.ExecutionException: java.lang.OutOfMemoryError: PermGen space
[error] Use 'last' for the full log.
> last
[debug] Running task... Cancelable: false, check cycles: false
[debug]
[debug] Initial source changes:
[debug]     removed:Set()
[debug]     added: Set()
[debug]     modified: Set()
[debug] Removed products: Set()
[debug] Modified external sources: Set()
[debug] Modified binary dependencies: Set()
[debug] Initial directly invalidated sources: Set()
[debug]
[debug] Sources indirectly invalidated by:
[debug]     product: Set()
[debug]     binary dep: Set()
[debug]     external source: Set()
[debug] Initially invalidated: Set()
[debug] Copy resource mappings:
[debug]
[debug]
[debug] Initial source changes:
[debug]     removed:Set()
[debug]     added: Set()
[debug]     modified: Set()
[debug] Removed products: Set()
[debug] Modified external sources: Set()
[debug] Modified binary dependencies: Set()
[debug] Initial directly invalidated sources: Set()
[debug]
[debug] Sources indirectly invalidated by:
[debug]     product: Set()
[debug]     binary dep: Set()
[debug]     external source: Set()
[debug] Initially invalidated: Set()
[debug] Copy resource mappings:
[debug]
[debug] Framework implementation 'org.scalacheck.ScalaCheckFramework' not present.
[debug] Framework implementation 'org.specs.runner.SpecsFramework' not present.
[debug] Framework implementation 'org.scalatest.tools.ScalaTestFramework' not present.
[debug] Framework implementation 'com.novocode.junit.JUnitFramework' not present.
[debug] Subclass fingerprints: Stream((org.specs2.specification.SpecificationStructure,false,org.specs2.runner.Fingerprints$$anon$1@34d6488c), ?)
[debug] Annotation fingerprints: Stream()
[debug] Running Test ExpandoObjectTest : subclass(false, org.specs2.specification.SpecificationStructure) with arguments
java.util.concurrent.ExecutionException: java.lang.OutOfMemoryError: PermGen space
    at java.util.concurrent.FutureTask$Sync.innerGet(FutureTask.java:252)
    at java.util.concurrent.FutureTask.get(FutureTask.java:111)
    at sbt.ConcurrentRestrictions$$anon$4.take(ConcurrentRestrictions.scala:196)
    at sbt.Execute.next$1(Execute.scala:85)
    at sbt.Execute.processAll(Execute.scala:88)
    at sbt.Execute.runKeep(Execute.scala:68)
    at sbt.EvaluateTask$.run$1(EvaluateTask.scala:162)
    at sbt.EvaluateTask$.runTask(EvaluateTask.scala:177)
    at sbt.Aggregation$$anonfun$4.apply(Aggregation.scala:46)
    at sbt.Aggregation$$anonfun$4.apply(Aggregation.scala:44)
    at sbt.EvaluateTask$.withStreams(EvaluateTask.scala:137)
    at sbt.Aggregation$.runTasksWithResult(Aggregation.scala:44)
    at sbt.Aggregation$.runTasks(Aggregation.scala:59)
    at sbt.Aggregation$$anonfun$applyTasks$1.apply(Aggregation.scala:31)
    at sbt.Aggregation$$anonfun$applyTasks$1.apply(Aggregation.scala:30)
    at sbt.Command$$anonfun$applyEffect$2$$anonfun$apply$3.apply(Command.scala:62)
    at sbt.Command$$anonfun$applyEffect$2$$anonfun$apply$3.apply(Command.scala:62)
    at sbt.Command$.process(Command.scala:90)
    at sbt.MainLoop$$anonfun$next$1$$anonfun$apply$1.apply(MainLoop.scala:71)
    at sbt.MainLoop$$anonfun$next$1$$anonfun$apply$1.apply(MainLoop.scala:71)
    at sbt.State$$anon$2.process(State.scala:170)
    at sbt.MainLoop$$anonfun$next$1.apply(MainLoop.scala:71)
    at sbt.MainLoop$$anonfun$next$1.apply(MainLoop.scala:71)
    at sbt.ErrorHandling$.wideConvert(ErrorHandling.scala:18)
    at sbt.MainLoop$.next(MainLoop.scala:71)
    at sbt.MainLoop$.run(MainLoop.scala:64)
    at sbt.MainLoop$$anonfun$runWithNewLog$1.apply(MainLoop.scala:53)
    at sbt.MainLoop$$anonfun$runWithNewLog$1.apply(MainLoop.scala:50)
    at sbt.Using.apply(Using.scala:25)
    at sbt.MainLoop$.runWithNewLog(MainLoop.scala:50)
    at sbt.MainLoop$.runAndClearLast(MainLoop.scala:33)
    at sbt.MainLoop$.runLoggedLoop(MainLoop.scala:17)
    at sbt.MainLoop$.runLogged(MainLoop.scala:13)
    at sbt.xMain.run(Main.scala:26)
    at xsbt.boot.Launch$.run(Launch.scala:55)
    at xsbt.boot.Launch$$anonfun$explicit$1.apply(Launch.scala:45)
    at xsbt.boot.Launch$.launch(Launch.scala:69)
    at xsbt.boot.Launch$.apply(Launch.scala:16)
    at xsbt.boot.Boot$.runImpl(Boot.scala:31)
    at xsbt.boot.Boot$.main(Boot.scala:20)
    at xsbt.boot.Boot.main(Boot.scala)
Caused by: java.lang.OutOfMemoryError: PermGen space
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClass(ClassLoader.java:791)
    at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
    at java.net.URLClassLoader.defineClass(URLClassLoader.java:449)
    at java.net.URLClassLoader.access$100(URLClassLoader.java:71)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:423)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:356)
    at sbt.Project$$anon$5.apply(Project.scala:130)
    at sbt.Project$$anon$5.apply(Project.scala:128)
    at sbt.LogManager$.commandBase$1(LogManager.scala:59)
    at sbt.LogManager$.command$1(LogManager.scala:60)
    at sbt.LogManager$$anonfun$suppressedMessage$1.apply(LogManager.scala:61)
    at sbt.LogManager$$anonfun$suppressedMessage$1.apply(LogManager.scala:61)
    at sbt.ConsoleLogger.trace(ConsoleLogger.scala:163)
    at sbt.AbstractLogger.log(Logger.scala:32)
    at sbt.MultiLogger$$anonfun$dispatch$1.apply(MultiLogger.scala:40)
    at sbt.MultiLogger$$anonfun$dispatch$1.apply(MultiLogger.scala:38)
    at scala.collection.LinearSeqOptimized$class.foreach(LinearSeqOptimized.scala:59)
    at scala.collection.immutable.List.foreach(List.scala:76)
    at sbt.MultiLogger.dispatch(MultiLogger.scala:38)
    at sbt.MultiLogger.trace(MultiLogger.scala:30)
    at sbt.TestLogger$$anon$2.trace(TestReportListener.scala:71)
    at sbt.TestLogger.endGroup(TestReportListener.scala:88)
    at sbt.TestRunner$$anonfun$run$5.apply(TestFramework.scala:87)
    at sbt.TestRunner$$anonfun$run$5.apply(TestFramework.scala:87)
    at sbt.TestFramework$$anonfun$safeForeach$1.apply(TestFramework.scala:112)
    at sbt.TestFramework$$anonfun$safeForeach$1.apply(TestFramework.scala:112)
    at scala.collection.LinearSeqOptimized$class.foreach(LinearSeqOptimized.scala:59)
[error] java.util.concurrent.ExecutionException: java.lang.OutOfMemoryError: PermGen space
[error] Use 'last' for the full log.

有时它也会突然退出：

sbt appears to be exiting abnormally.
  The log file for this session is at /var/folders/vf/3khb58091wd0_1rz1yh6knb00000gp/T/sbt3242766352271599341.log
java.lang.OutOfMemoryError: PermGen space
Error during sbt execution: java.lang.OutOfMemoryError: PermGen space

有什么解决办法吗？

Answer 1

如果您编译庞大的代码库，有时会发生这种情况 - 很多类被加载到运行 sbt 的 VM 中。

您需要为 sbt 增加 PermGen 空间 - 使用标志 -XX:MaxPermSize=256m，其中 256 您可以更改为永久代所需的大小。

运行：

cat `which sbt`

找到你的 sbt 启动脚本。然后编辑它以包含带有java 命令的标志，该命令以与described here 类似的方式运行sbt 启动器，用于修改-Xmx 和-Xms。

添加 -XX:+CMSClassUnloadingEnabled 标志还应该使 sbt 能够卸载具有不再使用的先前编译运行的类的类加载器。

编辑：

或者，如果您使用extended script for running sbt，您可以在SBT_OPTS 环境变量中设置这些选项。