PermGen space错误解决方法

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1.参考：

http://blog.csdn.net/fox009/article/details/5633007

http://hi.baidu.com/like_dark/blog/item/19c1948b3292b0799f2fb468.html

http://anyeeye.iteye.com/blog/444624

Tomcat6性能调优 出现java.lang.OutOfMemoryError: PermGen space

http://www.mkyong.com/tomcat/tomcat-javalangoutofmemoryerror-permgen-space/

 

2.报错：

Exception in thread "DispatcherThread" java.lang.OutOfMemoryError: PermGen space

Exception in thread "ContainerBackgroundProcessor[StandardEngine[Catalina]]" java.lang.OutOfMemoryError: PermGen space

Exception in thread "State Saver" java.lang.OutOfMemoryError: PermGen space

Exception in thread "AWT-Windows" java.lang.OutOfMemoryError: OutOfMemoryError

 

3.原因：

PermGen space的全称是Permanent Generation space,是指内存的永久保存区域,这块内存主要是被JVM存放Class和Meta信息的,Class在被Loader时就会被放到PermGen space中,它和存放类实例(Instance)的Heap区域不同,GC(Garbage Collection)不会在主程序运行期对PermGen space进行清理，所以如果你的应用中有很多CLASS的话,就很可能出现PermGen space错误,这种错误常见在web服务器对JSP进行pre compile的时候。如果你的WEB APP下都用了大量的第三方jar, 其大小超过了jvm默认的大小(4M)那么就会产生此错误信息了。

 

4.解决方法1： 

手动设置MaxPermSize大小，如果是linux系统，修改TOMCAT_HOME/bin/catalina.sh，如果是windows系统，修改TOMCAT_HOME/bin/catalina.bat，

在“echo "Using CATALINA_BASE: $CATALINA_BASE"”上面加入以下行：

JAVA_OPTS="-server -XX:PermSize=64M -XX:MaxPermSize=128m

建议：将相同的第三方jar文件移置到tomcat/shared/lib目录下，这样可以达到减少jar 文档重复占用内存的目的。

 

5.解决方法2

修改eclipse.ini文件，修改如下：

-vmargs

-Dosgi.requiredJavaVersion=1.5

-Xms128m

-Xmx512m

-XX:PermSize=64M

-XX:MaxPermSize=128M

 

如果还报错，可以考虑如下修改

-vmargs

-Dosgi.requiredJavaVersion=1.5

-Xms512m

-Xmx1024m

-XX:PermSize=256M

-XX:MaxPermSize=512M

 

报错：

2011-11-21 21:10:46 org.apache.catalina.loader.WebappClassLoader clearReferencesJdbc

严重: The web application [/Application] registered the JDBC driver [com.mysql.jdbc.Driver] but failed to unregister it when the web application was stopped. To prevent a memory leak, the JDBC Driver has been forcibly unregistered.

2011-11-21 21:10:46 org.apache.catalina.loader.WebappClassLoader clearReferencesThreads

严重: The web application [/Application] appears to have started a thread named [MySQL Statement Cancellation Timer] but has failed to stop it. This is very likely to create a memory leak.

2011-11-21 21:10:46 org.apache.catalina.loader.WebappClassLoader clearReferencesThreads

严重: The web application [/Application] appears to have started a thread named [AWT-Windows] but has failed to stop it. This is very likely to create a memory leak.

2011-11-21 21:10:46 org.apache.catalina.loader.WebappClassLoader clearReferencesThreads

严重: The web application [/Application] appears to have started a thread named [Thread-14] but has failed to stop it. This is very likely to create a memory leak.

2011-11-21 21:10:46 org.apache.catalina.loader.WebappClassLoader clearThreadLocalMap

严重: The web application [/Application] created a ThreadLocal with key of type [net.sf.json.AbstractJSON$1] (value [net.sf.json.AbstractJSON$1@3661eeb]) and a value of type [java.util.HashSet] (value [[]]) but failed to remove it when the web application was stopped. This is very likely to create a memory leak.

2011-11-21 21:10:50 org.apache.catalina.core.ApplicationContext log

信息: Initializing Spring FrameworkServlet 'Dispatcher'

 

修改catalina.bat

添加

JAVA_OPTS="-Djava.awt.headless=true -Dfile.encoding=UTF-8

-server -Xms1536m -Xmx1536m

-XX:NewSize=256m -XX:MaxNewSize=256m -XX:PermSize=256m

-XX:MaxPermSize=256m -XX:+DisableExplicitGC"

 

样例

#   JSSE_HOME       (Optional) May point at your Java Secure Sockets Extension

#                   (JSSE) installation, whose JAR files will be added to the

#                   system class path used to start Tomcat.

#   CATALINA_PID    (Optional) Path of the file which should contains the pid

#                   of catalina startup java process, when start (fork) is used

# $Id: catalina.sh 609438 2008-01-06 22:14:28Z markt $

# -----------------------------------------------------------------------------

JAVA_OPTS="-Djava.awt.headless=true -Dfile.encoding=UTF-8 -server -Xms1536m

-Xmx1536m -XX:NewSize=256m -XX:MaxNewSize=256m -XX:PermSize=256m

-XX:MaxPermSize=256m -XX:+DisableExplicitGC"

 

# OS specific support.  $var _must_ be set to either true or false.

cygwin=false

os400=false

darwn=false

case "`uname`" in

CYGWIN*) cygwin=true;;

OS400*) os400=true;;

Darwin*) darwin=true;;

esac

 

# resolve links - $0 may be a softlink

PRG="$0"

 

具体参数根据自己机器情况而定

JAVA_OPTS="-Djava.awt.headless=true -Dfile.encoding=UTF-8 -server -Xms512m

-Xmx512m -XX:NewSize=256m -XX:MaxNewSize=256m -XX:PermSize=256m

-XX:MaxPermSize=256m -XX:+DisableExplicitGC"