1.參考：
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性能調優 出現java.lang.OutOfMemoryError: PermGen space
http://www.mkyong.com/tomcat/tomcat-javalangoutofmemoryerror-permgen-space/
2.報錯：
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的全稱是Permanent Generation space,是指內存的永久保存區域,這塊內存主要是被JVM存放Class和Meta信息的,Class在被Loader時就會被放到PermGen space中,它和存放類實例(Instance)的Heap區域不同,GC(Garbage Collection)不會在主程序運行期對PermGen space進行清理，所以如果你的應用中有很多CLASS的話,就很可能出現PermGen space錯誤,這種錯誤常見在web服務器對JSP進行pre compile的時候。如果你的WEB APP下都用了大量的第三方jar, 其大小超過了jvm默認的大小(4M)那么就會產生此錯誤信息了。
4.解決方法1：
手動設置MaxPermSize大小，如果是linux系統，修改TOMCAT_HOME/bin/catalina.sh，如果是windows系統，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
建議：將相同的第三方jar文件移置到tomcat/shared/lib目錄下，這樣可以達到減少jar 文檔重復占用內存的目的。
5.解決方法2
修改eclipse.ini文件，修改如下：
-
vmargs
-Dosgi.requiredJavaVersion=1.5
-
Xms128m
-
Xmx512m
-XX:PermSize=
64M
-XX:MaxPermSize=128M
如果還報錯，可以考慮如下修改
-
vmargs
-Dosgi.requiredJavaVersion=1.5
-
Xms512m
-
Xmx1024m
-XX:PermSize=
256M
-XX:MaxPermSize=512M
報錯：
2011-11-21 21:10:46
org.apache.catalina.loader.WebappClassLoader clearReferencesJdbc
嚴重: 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
嚴重: 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
嚴重: 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
嚴重: 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
嚴重: 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"
樣例
# 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 darwin = false case "`uname`" in CYGWIN *) cygwin= true ;; OS400 *) os400= true ;; Darwin *) darwin= true ;; esac # resolve links - $0 may be a softlink PRG ="$0"
具體參數根據自己機器情況而定
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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