what to do with tomcat PermGen space

Question

BACKGROUND: I have a web Project which uses JSP. The IDE is Eclipse. The configuration of tomcat is: Automatically publish when resources change and publish

Answer 1

setting like this:

-Xms128m -Xmx1024m -XX:PermSize=64m -XX:MaxPermSize=256m

Answer 2

Tomcat server runs different JAVA and the eclipse runs in different JAVA.

So adding -XX:MaxPermSize=512m to eclipse.ini will help resolving this issue. Follow the below steps to add this to tomcat server:

• Double click server in eclipse

• open launch configuration

• add "-XX:MaxPermSize=512m" to VM arguments in the Arguments tab.

Answer 3

You may set environment variable named : "JAVA_OPTS" and set value of it as follows -Xms256m -Xmx1024m -XX:PermSize=256m -XX:MaxPermSize=512m

Answer 4

Tomcat does need a lot of permgen. 512m is not an unreasonable max. However it only delays the hot-deploy leak. Permgen will grow ~25mb per hotdeploy, which, in Eclipse, might be every time you save a Java file. 512m disappears fast if you have a Ctrl+S twitch like me.

The solution: allow Java to kick class definitions out of memory, i.e., garbage collect byte code. Add these along with your boosted permgen size:

-XX:+CMSClassUnloadingEnabled -XX:+UseConcMarkSweepGC

Answer 5

FOR ECLIPSE

1. Go to server properties
2. Go to platform
3. Now in VM argument write this -Xms256m -Xmx256m -XX:PermSize=256m -XX:MaxPermSize=512m

FOR NETBEANS

1. Go to Netbeans folder/etc/
2. open netbeans.config in any editor
3. edit this line as

netbeans_default_options="-J-client -J-Xss256m -J-Xms256m -J-XX:PermSize=256m -XX:MaxPermSize=512m -J-Dapple.laf.useScreenMenuBar=true -J-Dapple.awt.graphics.UseQuartz=true -J-Dsun.java2d.noddraw=true -J-Dsun.java2d.dpiaware=true -J-Dsun.zip.disableMemoryMapping=true"

Thats all

Answer 6

Just to add for Windows, if someone is still stuck:--

1. Open catalina.bat file (located at Apache tomcat installation folder/bin)

2. Set JAVA_OPTS as follows in the very start(before actually its first use anywhere in the file):--

   set JAVA_OPTS=-Dfile.encoding=UTF-8 -Xms128m -Xmx1024m -XX:PermSize=64m -XX:MaxPermSize=256m

3. Restart Tomcat and its done.

You can find nice explanation here