问题
I have a Tomcat6 running on a Windows2003 machine. I deployed 2 Grails apps on this server and I soon noticed that everything was crashing sometime after the deploy with a classic PermGen error.
java.lang.OutOfMemoryError: PermGen space
java.lang.ClassLoader.defineClass1(Native Method)
java.lang.ClassLoader.defineClassCond(ClassLoader.java:632)
java.lang.ClassLoader.defineClass(ClassLoader.java:616)
org.codehaus.groovy.reflection.ClassLoaderForClassArtifacts.de
...
So I found a common fix for this problem: increasing heap and permgen space with:
set CATALINA_OPTS="-Xms1024m -Xmx1024m -XX:PermSize=128m -XX:MaxPermSize=512m"
Added into C:\apache-tomcat-6.0.26\bin\catalina.bat. Unfortunately this didn't work, but the problem is that I'm not sure that Tomcat is picking it up. I checked various logs but these options are never printed out. Is there a way to log them and make sure that Tomcat has read them?
EDIT: I tried to add the following JVM options with tomcat6w.exe:
-XX:+CMSClassUnloadingEnabled
-XX:+CMSPermGenSweepingEnabled
-XX:+UseConcMarkSweepGC
And nothing changed. I get a permGen after 2-3 minutes of uptime. Any other idea?
Cheers! Mulone
回答1:
Thank you all! I finally solved the issue by adding:
-XX:+CMSClassUnloadingEnabled
-XX:+CMSPermGenSweepingEnabled
-XX:+UseConcMarkSweepGC
-XX:PermSize=128m
-XX:MaxPermSize=512m
To the java options on tomcat6w.exe.
Thanks!
回答2:
Actual way to do it (in Catalina.bat),
set "JAVA_OPTS=-Djava.awt.headless=true -server -Xms512m -Xmx2048m -XX:PermSize=512m -XX:MaxPermSize=1024m -XX:+CMSClassUnloadingEnabled -XX:+CMSPermGenSweepingEnabled"
add this line in such a position so that this JAVA_OPTS is transferred to any of _EXECJAVA command at the end of file (if-else nested). I personally write this line as first statement of this batch
回答3:
I actually set those as JAVA_OPTS for my JVM before starting the server
JAVA_OPTS=-Djvmarg='-Xms1024m -Xmx1024m -XX:PermSize=128m -XX:MaxPermSize=512m'
回答4:
Look where you are setting it, use echo [statements]
to troubleshoot, try setting it right before its passed to the VM, something like:
set CATALINA_OPTS="-Xms1024m -Xmx1024m -XX:PermSize=128m -XX:MaxPermSize=512m"
_EXECJAVA% %JAVA_OPTS% %CATALINA_OPTS% %DEBUG_OPTS%
-Djava.endorsed.dirs="%JAVA_ENDORSED_DIRS%" -classpath "%CLASSPATH%"
-Dcatalina.base="%CATALINA_BASE%" -Dcatalina.home="%CATALINA_HOME%"
-Djava.io.tmpdir="%CATALINA_TMPDIR%" %MAINCLASS% %CMD_LINE_ARGS% %ACTION%
Make sure you have the right EXEC_JAVA
not sure which version of the .bat
file you have, but probably several if
statements.
Also make sure these are valid arguments for your VM.
You can check your max heap size within your java code, use:
long heapMaxSize = Runtime.getRuntime().maxMemory();
Just print it out, if its correct based on your settings, you have a bad memory leak, if its not, then tomcat
is not picking it up.
来源:https://stackoverflow.com/questions/3583757/how-to-make-sure-that-tomcat6-reads-catalina-opts-on-windows