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BACKGROUND: I have a web Project which uses JSP. The IDE is Eclipse. The configuration of tomcat is: Automatically publish when resources change and publishing interval is "1 second".
A property file in the classes folder which used to save some settings.It also can be dynamically modified by the servlet. The modify operation is trigerred by the save button in the JSP.
PROBLEM: After several save operation, Tomcat come with java.lang.OutOfMemoryError: PermGen space.
LOG MESSAGE
java.lang.OutOfMemoryError: PermGen space at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClassCond(ClassLoader.java:632) at java.lang.ClassLoader.defineClass(ClassLoader.java:616) at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141) at org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:1815) at org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:872) at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1325) at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1204) at org.apache.catalina.startup.WebAnnotationSet.loadApplicationServletAnnotations(WebAnnotationSet.java:108) at org.apache.catalina.startup.WebAnnotationSet.loadApplicationAnnotations(WebAnnotationSet.java:58) at org.apache.catalina.startup.ContextConfig.applicationAnnotationsConfig(ContextConfig.java:297) at org.apache.catalina.startup.ContextConfig.start(ContextConfig.java:1064) at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:261) at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:120) at org.apache.catalina.core.StandardContext.start(StandardContext.java:4238) at org.apache.catalina.core.StandardContext.reload(StandardContext.java:3083) at org.apache.catalina.loader.WebappLoader.backgroundProcess(WebappLoader.java:404) at org.apache.catalina.core.ContainerBase.backgroundProcess(ContainerBase.java:1279) at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1571) at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1580) at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1580) at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.run(ContainerBase.java:1560) at java.lang.Thread.run(Thread.java:662) 
767
The PermGen area of the Java heap is used to store metadata such as class declarations, methods and object arrays. Therefore, the PermGen size requirements depend on the number of classes and methods as well as their size. Java memory is separated into different regions - Young, Tenured and PermGen.
To fix it, increase the PermGen memory settings by using the following Java VM options. -XX:PermSize<size> - Set initial PermGen Size. -XX:MaxPermSize<size> - Set the maximum PermGen Size. In the next step, we will show you how to set the VM options in Tomcat, under Windows and Linux environment.
OutOfMemoryError: PermGen space. As explained in the above paragraph this OutOfMemory error in java comes when the Permanent generation of heap is filled up. To fix this OutOfMemoryError in Java, you need to increase the heap size of the Perm space by using the JVM option "-XX: MaxPermSize".
PermGen (Permanent Generation) is a special heap space separated from the main memory heap. The JVM keeps track of loaded class metadata in the PermGen. Additionally, the JVM stores all the static content in this memory section.
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 If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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