How to clear PermGen space Error in tomcat

Question

I am working in a Windows Environment  and I am getting this error every time I am working with tomcat-  Apr 30  2012 5 30 37 PM org apache catalina core StandardWrapperValve invoke SEVERE  Servlet service   for servlet default threw exception java lang OutOfMemoryError  PermGen space 2012-04-30 17 30 37 719 INFO net spy memcached MemcachedConnection   Connection state changed for sun nio ch SelectionKeyImpl 4ae53a99 2012-04-30 17 30 37 719 INFO net spy memcached MemcachedConnection   Reconnecting due to failure to connect to  QA sa localhost 127 0 0 1 11211   Rops 0   Wops 0   iq 0  topRop null  topWop null  toWrite 0  interested 0  java net ConnectException  Connection refused  no further information Apr 30  2012 5 30 37 PM org apache catalina core StandardWrapperValve invoke SEVERE  Servlet service   for servlet default threw exception java lang OutOfMemoryError  PermGen space Exception in thread  Memcached IO over  MemcachedConnection to localhost 127 0 0 1 11211   java lang OutOfMemoryError  PermGen space Apr 30  2012 5 30 38 PM org apache coyote http11 Http11Processor process SEVERE  Error processing request java lang OutOfMemoryError  PermGen space Apr 30  2012 5 30 38 PM org apache coyote http11 Http11Processor process SEVERE  Error processing request java lang OutOfMemoryError  PermGen space Apr 30  2012 5 30 38 PM org apache coyote http11 Http11Processor process SEVERE  Error processing request java lang OutOfMemoryError  PermGen space Apr 30  2012 5 30 41 PM org apache catalina connector CoyoteAdapter service SEVERE  An exception or error occurred in the container during the request processing java lang OutOfMemoryError  PermGen space Apr 30  2012 5 30 43 PM org apache catalina core StandardHostValve custom SEVERE  Exception Processing ErrorPage exceptionType java lang Throwable  location  error action  java lang OutOfMemoryError  PermGen space Apr 30  2012 5 30 42 PM org apache catalina core StandardHostValve custom SEVERE  Exception Processing ErrorPage exceptionType java lang Throwable  location  error action  java lang OutOfMemoryError  PermGen space Exception in thread  ContainerBackgroundProcessor StandardEngine Catalina    java lang OutOfMemoryError  PermGen space   I tried adding JAVA OPTS with the value as -Xms1024m -Xmx1024m in System Variables  but I am stillgetting the same error  java lang OutOfMemoryError  PermGen space  again and again    Any help will be appreciated  I have also read other posts on Stack Overflow also but it didn t work out

User · Answer

If tomcat is running as Windows Service neither CATALINA_OPTS nor JAVA_OPTS seems to have any effect.

You need to set it in Java options in GUI.

The below link explains it well

http://www.12robots.com/index.cfm/2010/10/8/Giving-more-memory-to-the-Tomcat-Service-in-Windows

User · Answer

In Tomcat 7 0 Windows Service Installer Version There is not catalina bat in  bin   So you need open Tomcat7w exe in  bin and add blow JVM argument  -XX PermSize 256m -XX MaxPermSize 512m   on Java Option in Java Tab  like this  You also add other options     Another  if you use IntellijIDEA you need add JVM argument in Server Configurations like this

User · Answer

AndreSmiley  s code of line worked for me   only modification required is   -XX MaxPermSize 256m   m  means MB   Actually my application is kinda huge so i was advised to make it 1024m for performance

User · Answer

You have to allocate more space to the PermGenSpace of the tomcat JVM   This can be done with the JVM argument   -XX MaxPermSize 128m  By default  the PermGen space is 64M  and it contains all compiled classes  so if you have a lot of jar  classes  in your classpath  you may indeed fill this space    On a side note  you can monitor the size of the PermGen space with JVisualVM and you can even inspect its content with YourKit Java Profiler

User · Answer

I tried the same on Intellij Ideav11   It was not picking up the settings after checking the process using grep  In case it does not  give the mem settings for JAVA OPTS in catalina sh instead

User · Answer

This one worked for me  in startup bat the following line needs to be added if it doesn t exist set JAVA OPTS with the value -Xms128m -Xmx1024m -XX PermSize 64m -XX MaxPermSize 256  The full line   set JAVA OPTS -Dfile encoding UTF-8 -Xms128m -Xmx1024m -XX PermSize 64m -XX MaxPermSize 256

User · Answer

I m running tomcat7 on CentOS 6 6  I tried creating a new  usr share tomcat bin setenv sh file and setting both JAVA OPTS and CATALINA OPTS  But tomcat wouldn t pick up the values on restart  When I put the following line into  etc tomcat tomcat conf   CATALINA OPTS  -Xms128m -Xmx1024m -XX MaxPermSize 1024m    tomcat did pick up the new environment variable  I verified this by running     ps aux   grep tomcat   and seeing the new settings in the output  This took a long time to diagnose and I didn t see anyone else suggesting this  so I thought I d throw it out to the internet community

User · Answer

Killing the tomcat process forcefully  kill -9 for Linux  and starting it again solves the issue  My guess is  the tomcat instance doesn t get killed properly using shutdown bat  So  we need to forcefully kill the process and start again

User · Answer

The PermGen space is what Tomcat uses to store class definitions  definitions only  no instantiations  and string pools that have been interned  From experience  the PermGen space issues tend to happen frequently in dev environments really since Tomcat has to load new classes every time it deploys a WAR or does a jspc  when you edit a jsp file   Personally  I tend to deploy and redeploy wars a lot when I   m in dev testing so I know I   m bound to run out sooner or later  primarily because Java   s GC cycles are still kinda crap so if you redeploy your wars quickly and frequently enough  the space fills up faster than they can manage    This should theoretically be less of an issue in production environments since you  hopefully  don   t change the codebase on a 10 minute basis  If it still occurs  that just means your codebase  and corresponding library dependencies  are too large for the default memory allocation and you   ll just need to mess around with stack and heap allocation  I think the standards are stuff like    -XX MaxPermSize SIZE   I   ve found however the best way to take care of that for good is to allow classes to be unloaded so your PermGen never runs out   -XX  CMSClassUnloadingEnabled -XX  CMSPermGenSweepingEnabled   Stuff like that worked magic for me in the past  One thing tho  there   s a significant performance tradeoff in using those  since permgen sweeps will make like an extra 2 requests for every request you make or something along those lines  You   ll need to balance your use with the tradeoffs

User · Answer

If your using eclipse with tomcat follow the below steps   On server window Double click on tomcat  It will open the tomcat s Overview window   In the Overview window you will find Open launch configuration under General information and click on Open launch configuration  In the edit Configuration window look for Arguments and click on It  In the arguments tag look for VM arguments  simply paste this  -Xms256m -Xmx512m -XX PermSize 256m -XX MaxPermSize 512m to the end of the arguments

User · Answer

To complement Michael s answer  and according to this answer  a safe way to deal with the problem is to use the following arguments   -XX  CMSClassUnloadingEnabled -XX  CMSPermGenSweepingEnabled -XX  UseConcMarkSweepGC

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