Tomcat – java.lang.OutOfMemoryError: PermGen space

解决Tomcat PermGen空间不足导致的OutOfMemoryError

最新推荐文章于 2025-12-02 21:20:38 发布

原创最新推荐文章于 2025-12-02 21:20:38 发布 · 125 阅读

0 ·

CC 4.0 BY-SA版权

文章标签：

#java

Tomcat 专栏收录该内容

2 篇文章

订阅专栏

本文详细介绍了如何通过调整Tomcat配置文件来解决在启动和停止时出现的PermGen空间不足引发的Java.lang.OutOfMemoryError问题。通过修改catalina.sh文件中的JAVA_OPTS变量，可以增加内存分配，特别是PermSize和MaxPermSize，以避免此错误发生。

Tomcat production server sometime will hit the following java.lang.OutOfMemoryError: PermGen space error.

java.lang.OutOfMemoryError: PermGen space
        at java.lang.ClassLoader.defineClass1(Native Method)
        at java.lang.ClassLoader.defineClass(ClassLoader.java:620)
        at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124)

It’s usually happened when the Tomcat start and stop few times. It’s just funny, however you can fine tune it with some minor changes in the Tomcat configuration setting. By default, Tomcat assigned very little memory for the running process, you should increase the memory by make change in catalina.sh or catalina.bat file.

How to fix it?

1) Find where is Cataline.sh located. We need to make some changes in “catalina.sh” file.
P.S Cataline.sh is located at \tomcat folder\bin\catalina.sh

2) Assign following line to JAVA_OPTS variable and add it into catalina.sh file.

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"

Partial example of the catalina.sh file

#   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"

3) Done. Restart Tomcat.

You should change the “Xms” and “PermSize” value base on your server capability.