如何处理tomcat PermGen空间 [英] what to do with tomcat PermGen space

问题描述

背景：我有一个使用JSP的Web项目。 IDE是Eclipse。
tomcat的配置是：当资源发生变化并且发布间隔为1秒时自动发布。

BACKGROUND: I have a web Project which uses JSP. The IDE is Eclipse. The configuration of tomcat is: Automatically publish when resources change and publishing interval is "1 second".

用于保存的classes文件夹中的属性文件一些设置。它也可以由servlet动态修改。修改操作由JSP中的保存按钮触发。

A property file in the classes folder which used to save some settings.It also can be dynamically modified by the servlet. The modify operation is trigerred by the save button in the JSP.

问题：经过多次保存操作后，Tomcat附带 java.lang.OutOfMemoryError：PermGen space 。

PROBLEM: After several save operation, Tomcat come with java.lang.OutOfMemoryError: PermGen space.

LOG MESSAGE

java.lang.OutOfMemoryError: PermGen space
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClassCond(ClassLoader.java:632)
    at java.lang.ClassLoader.defineClass(ClassLoader.java:616)
    at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141)
    at org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:1815)
    at org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:872)
    at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1325)
    at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1204)
    at org.apache.catalina.startup.WebAnnotationSet.loadApplicationServletAnnotations(WebAnnotationSet.java:108)
    at org.apache.catalina.startup.WebAnnotationSet.loadApplicationAnnotations(WebAnnotationSet.java:58)
    at org.apache.catalina.startup.ContextConfig.applicationAnnotationsConfig(ContextConfig.java:297)
    at org.apache.catalina.startup.ContextConfig.start(ContextConfig.java:1064)
    at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:261)
    at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:120)
    at org.apache.catalina.core.StandardContext.start(StandardContext.java:4238)
    at org.apache.catalina.core.StandardContext.reload(StandardContext.java:3083)
    at org.apache.catalina.loader.WebappLoader.backgroundProcess(WebappLoader.java:404)
    at org.apache.catalina.core.ContainerBase.backgroundProcess(ContainerBase.java:1279)
    at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1571)
    at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1580)
    at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1580)
    at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.run(ContainerBase.java:1560)
    at java.lang.Thread.run(Thread.java:662)

推荐答案

Tomcat确实需要大量的permgen。 512米不是一个不合理的最大值。然而，它只会延迟热部署泄漏。 Permgen每个hotdeploy将增长约25mb，在Eclipse中，每次保存Java文件时都可能。如果你有像我这样的Ctrl + S抽搐，512米会快速消失。

Tomcat does need a lot of permgen. 512m is not an unreasonable max. However it only delays the hot-deploy leak. Permgen will grow ~25mb per hotdeploy, which, in Eclipse, might be every time you save a Java file. 512m disappears fast if you have a Ctrl+S twitch like me.

解决方案：允许Java将类定义从内存中取出，即垃圾收集字节码。添加这些以及提升的permgen大小：

The solution: allow Java to kick class definitions out of memory, i.e., garbage collect byte code. Add these along with your boosted permgen size:

-XX:+CMSClassUnloadingEnabled -XX:+UseConcMarkSweepGC

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