StackOverflow2013

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plurals

PO
primarykey
Id
7385259
data
AcceptedAnswerId
0
AnswerCount
0
ClosedDate
CommentCount
0
CommunityOwnedDate
CreationDate
2011-09-12T08:42:33.907
FavoriteCount
0
LastActivityDate
2011-09-12T12:54:55.557
LastEditDate
2017-05-23T12:04:28.170
LastEditorUserId
-1
OwnerUserId
507546
ParentId
7383658
PostTypeId
2
Score
7
ViewCount
0
LastEditorDisplayName
text
Body
I have got the same prolem when I run my web application under tomcat or jetty. Permanent genration memory is used for loading the classes and the idea is that "Classes are loaded once and forever". Since I am using quite a lot of libraries and Spring framework, this memory is filled up very quickly espectially when I redeploy the web application several time with out restarting the servlet container. I found that increasing the maximum permanent generation is not sufficient. You also need to allow the garbage collection to removed the unused classes at runtime, otherwise it will be filled up and throws PermGen space exception. Here are the JVM options that I added for my servlet containers, <pre><code>-XX:PermSize=128m -XX:MaxPermSize=256m -XX:+UseConcMarkSweepGC -XX:+CMSClassUnloadingEnabled </code></pre> <code>-XX:MaxPermSize</code> is used to set the maximum value of permanent generation. This should be greater than the default size. <code>-XX:+CMSClassUnloadingEnabled</code> this option is used to allows JVM to unload the class at runtime. By default, class unloading is disable. For Java 5, please read <a href="https://stackoverflow.com/questions/3717937/cmspermgensweepingenabled-vs-cmsclassunloadingenabled">this</a>. <code>-XX:+UseConcMarkSweepGC</code>, in order for class uploading option to work, this option must also be set (<a href="https://stackoverflow.com/questions/3717937/cmspermgensweepingenabled-vs-cmsclassunloadingenabled/3720052#3720052">ref</a>) Also, you should consider upgrading your JVM version. Java 5 is too old.
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1. USgigadot
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