PermGen space错误解决方法

比眉伴天荒 2021-09-25 21:54 404阅读 0赞

在看下文之前，首先要确认意见事情，就是你是如何启动tomcat的，我们在平时的开发环境当中，都是通过startup.bat方式启动tomcat的，那么你按照下面的方式，去修改/bin/catalina.bat是没有问题的。但是如果你是生产环境下，我们一般都希望使用windows服务方式去启动tomcat，此时之前修改的配置文件是没有用的。因为windows服务启动tomcat不再去加载catalina.bat当中的参数了，而是去加载注册表中的参数，所以我们需要修改注册表。

HKEY\_LOCAL\_MACHINE/SOFTWARE/Apache Software Foundation/Procrun 2.0/Tomcat\_APPNAME/Parameters/Java，修改JvmMs和JvmMx的值，当前我都将其设定为1024，也就是1个G的容量。具体性能再后面继续观察。 之前还真不知道windows服务启动和startup.bat启动的区别。 windows服务器启动是在注册表中加载参数，startup.bat启动是在catalina.bat加载参数。

![232321393198.png][]

## 1.参考： ##

[http://blog.csdn.net/fox009/article/details/5633007][http_blog.csdn.net_fox009_article_details_5633007]

[http://hi.baidu.com/like\_dark/blog/item/19c1948b3292b0799f2fb468.html][http_hi.baidu.com_like_dark_blog_item_19c1948b3292b0799f2fb468.html]

[http://anyeeye.iteye.com/blog/444624][http_anyeeye.iteye.com_blog_444624]

[Tomcat6性能调优 出现java.lang.OutOfMemoryError: PermGen space][Tomcat6_ _java.lang.OutOfMemoryError_ PermGen space]

[http://www.mkyong.com/tomcat/tomcat-javalangoutofmemoryerror-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：

![复制代码][copycode.gif]

-vmargs
    -Dosgi.requiredJavaVersion=1.5
    -Xms128m
    -Xmx512m
    -XX:PermSize=64M 
    -XX:MaxPermSize=128M

![复制代码][copycode.gif]

如果还报错，可以考虑如下修改

![复制代码][copycode.gif]

-vmargs
    -Dosgi.requiredJavaVersion=1.5
    -Xms512m
    -Xmx1024m
    -XX:PermSize=256M 
    -XX:MaxPermSize=512M

![复制代码][copycode.gif]

报错：

![复制代码][copycode.gif]

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'

![复制代码][copycode.gif]

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

![复制代码][copycode.gif]

#   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
    darwin=false
    case "`uname`" in
    CYGWIN*) cygwin=true;;
    OS400*) os400=true;;
    Darwin*) darwin=true;;
    esac
     
    # resolve links - $0 may be a softlink
    PRG="$0"

![复制代码][copycode.gif]

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"

[232321393198.png]: /images/20210923/219b63c1b879467baa5df20924ce08d6.png
[http_blog.csdn.net_fox009_article_details_5633007]: http://blog.csdn.net/fox009/article/details/5633007
[http_hi.baidu.com_like_dark_blog_item_19c1948b3292b0799f2fb468.html]: http://hi.baidu.com/like_dark/blog/item/19c1948b3292b0799f2fb468.html
[http_anyeeye.iteye.com_blog_444624]: http://anyeeye.iteye.com/blog/444624
[Tomcat6_ _java.lang.OutOfMemoryError_ PermGen space]: http://hi.baidu.com/chssheng2007/blog/item/22e7b1d37d7f480b3af3cf18.html
[http_www.mkyong.com_tomcat_tomcat-javalangoutofmemoryerror-permgen-space]: http://www.mkyong.com/tomcat/tomcat-javalangoutofmemoryerror-permgen-space/
[copycode.gif]: /images/20210923/53a46bd1b21f443dab9d922503086d5f.png