PermGen space错误解决方法

1.参考：

2.报错：

Exception in thread "DispatcherThread" java.lang.OutOfMemoryError: PermGen spaceException in thread "ContainerBackgroundProcessor[StandardEngine[Catalina]]" java.lang.OutOfMemoryError: PermGen spaceException in thread "State Saver" java.lang.OutOfMemoryError: PermGen spaceException 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=falseos400=falsedarwin=falsecase "`uname`" inCYGWIN*) cygwin=true;;OS400*) os400=true;;Darwin*) darwin=true;;esac # resolve links - $0 may be a softlinkPRG="$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"

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