Permgen Error
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Join them; it only takes a minute: Sign up Dealing with “java.lang.OutOfMemoryError: PermGen space” error up vote 1045 down vote favorite 402 Recently I ran into this error in my web application: java.lang.OutOfMemoryError: PermGen space It's a typical
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Hibernate/JPA + IceFaces/JSF application running on Tomcat 6 and JDK 1.6. Apparently this can occur after redeploying an application a few times. What causes it and what can be done to avoid it? How do I fix the problem? java exception memory-leaks out-of-memory permgen share|improve this question edited May 11 at 12:58 community wiki 7 revs, 6 users 55%Chris I have fought this for hours, but I have no good news. See my related question: stackoverflow.com/questions/1996088/… permgen space gradle You may still have a memory leak, e.g. classes are not garbage collected because your WebAppClassLoader is not garbage collected (it has an external reference that is not cleared). increasing the PermGen will only delay the OutOfMemoryError, and allowing class garbage collection is a precondition, but will not garbage collect classes if their class loader still has references to it. –Eran Medan Jan 14 '10 at 11:48 I got this error at adding display taglib. Removing so also solved the error. Why so? –masT Nov 14 '13 at 11:51 And how did you run into it? –Thorbjørn Ravn Andersen Feb 25 '14 at 4:16 10 use JDK 1.8 :þ welcome to the MetaSpace –Rytek Mar 20 '14 at 16:25 add a comment| 32 Answers 32 active oldest votes 1 2 next up vote 515 down vote accepted The solution was to add these flags to JVM command line when Tomcat is started: -XX:+CMSClassUnloadingEnabled -XX:+CMSPermGenSweepingEnabled You can do that by shutting down the tomcat service, then going into the Tomcat/bin directory and running tomcat6w.exe. Under the "Java" tab, add the arguments to the "Java Options" box. Click "OK" and then restart the service. If you get an error the specified service does not exist as an installed service you should run: tomcat6w //ES//servicename where servicename is the name of the server as viewed in services.msc Source: orx's comme
API Home » Java » Understanding and avoiding the Java Permgen Space error 36 Understanding and avoiding the Java Permgen Space error - Steffen permgen java Luypaert Share Tweet Posted by Steffen Luypaert on Jul 24, 2011 in how to resolve java.lang.outofmemoryerror permgen space Java Java Performance PermGen In this article, I look into what it means when a Java program runs what is permgen into a OutOfMemoryError: PermGen Space error. I first explain what the permanent generation heap space is, after which I explain the usual cause of the Permgen Space error and http://stackoverflow.com/questions/88235/dealing-with-java-lang-outofmemoryerror-permgen-space-error I give some pointers on how to avoid it. Introduction Usually, we do not look into JVM intrinsics. We take the JVM as is. Some of the world’s finest engineers are working on the JVM(s) and I am sure we can’t improve their work, definitely not without getting seriously involved. However, as a Java developer, you are often http://www.integratingstuff.com/2011/07/24/understanding-and-avoiding-the-java-permgen-space-error/ confronted with performance issues, usually working memory related. The problem I run into most is the dreaded OutOfMemoryError: PermGen Space error. I thought it would be nice to know more about it, so I looked into what causes it exactly. Java memory structure To understand the error, we have to look into how the jvm memory is structured. There are two memory regions in the JVM: the heap and the stack. Local variables and methods reside on the stack, everything else on the heap. This Java heap memory is structured again into regions, called generations. The longer an object lives, the higher the chance it will be promoted to an older generation. Young generations(such as Eden on Sun JVM) are more garbage collected than older generations(survivor and tenured on Sun JVM). However, there is also some separate heap space called permanent generation. Since it is a separate region, it is not considered part of the Java Heap space. Objects in this space are relatively permanent. Class definitions are stored here, as are static instances
thread "DefaultQuartzScheduler_QuartzSchedulerThread" java.lang.OutOfMemoryError: PermGen space Exception in thread "http-80-Processor1" java.lang.OutOfMemoryError: PermGen space Exception in thread "http-80-Processor2" java.lang.OutOfMemoryError: https://confluence.atlassian.com/confkb/confluence-crashes-due-to-outofmemoryerror-permgen-space-126910596.html PermGen space Exception in thread "com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread-#1" java.lang.OutOfMemoryError: PermGen space Cause If you get the error message: java.lang.OutOfMemoryError: PermGen space this means that you have exceeded http://javarevisited.blogspot.com/2011/09/javalangoutofmemoryerror-permgen-space.html Java's fixed block for loading class files. Permanent Generation Memory, unlike Java heap space, is the memory allocation for the classes themselves as opposed to the permgen space objects created. The addition of more plugins contributes to more consumption of PermGen space. The error occurs when enough classes are invoked. Resolution This is only relevant for Confluence 5.7 and below as Java 8 manages PermGen automatically. To avoid this in the future follow the steps detailed in the guide permgen space tomcat How to fix out of memory errors by increasing available memory. Find the instructions on how to increase the Permanent Generation Space. Make sure to change -XX:MaxPermSize rather than the Heap Space Parameters. Confluence doesn't require a huge amount of PermGen memory, so if you find that you need to increase it to more than 512MB this could indicate a problem with either the application or an installed addon. Was this helpful? Yes No Thanks for your feedback! Why was this unhelpful? It wasn't accurate It wasn't clear It wasn't relevant Submit feedback Cancel Have a question about this article? See questions about this article Powered by Confluence and Scroll Viewport Atlassian Support Ask the community Provide product feedback Contact technical support Atlassian Privacy Policy Terms of use Security Copyright © 2016 Atlassian Except where otherwise noted, content in this space is licensed under a Creative Commons Attribution 2.5 Australia License.
in Java Everyone in java development faces java.lang.OutOfMemoryError now and then, OutOfMemoryError in Java is one problem which is more due to system's limitation (memory) rather than due to programming mistakes in most cases though in certain cases you could have a memory leak which causing OutOfMemoryError. I have found that even though java.lang.OutOfMemoryError is quite common basic knowledge of its cause and solution is largely unknown among junior developers. Beginners books like Head First Java doesn't teach you much about how to deal with this kind of error. You need real experience dealing with production systems, handling a large number of user sessions to troubleshoot and fix performance issues like running out of memory. If you want to be good at troubleshooting and performance analysis, you need to learn some books on Java performance and profiling e.g. Java Performance The Definitive Guide By Scott Oaks or the Java Performance by Binu John. They are an excellent resource for senior Java developers and also teaches you tools and process to deal with an error like java.lang.OutOfMemoryError. In this article, we will explore what is java.lang.OutOfMemoryError; Why OutOfMemoryError comes in Java application, different type of OutOfMemoryError and How to fix OutOfMemoryError in Java. This article is purely meant to provide basic knowledge of java.lang.OutMemoryError and won't discuss profiling in detail. For profiling read the books I have mentioned before. What is java.lang.OutOfMemoryError in Java OutOfMemoryError in Java is a subclass of java.lang.VirtualMachineError and JVM throws java.lang.OutOfMemoryError when it ran out of memory in the heap. OutOfMemoryError in Java can come anytime in heap mostly while you try to create an object and there is not enough space on the heap to allocate that object. Javadoc of OutOfMemoryError is not very informative about this, thou