文章借鑑於網絡，具體地址記不清楚了！如果有侵犯您的版權，請及時聯繫我刪除或註明您的鏈接地址！謝謝！ 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)那麼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 文檔重複佔用內存的目的。 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 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"