Java Permgen Error
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Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up Dealing with “java.lang.OutOfMemoryError: PermGen space” error up vote 1042 down vote favorite
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402 Recently I ran into this error in my web application: java.lang.OutOfMemoryError: PermGen space It's a typical 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 permgen space jenkins 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/… 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
here for a quick overview of the site Help Center Detailed answers to any questions you might have how to resolve java.lang.outofmemoryerror permgen space Meta Discuss the workings and policies of this site About Us Learn permgen java more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us java permgen space increase Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like http://stackoverflow.com/questions/88235/dealing-with-java-lang-outofmemoryerror-permgen-space-error you, helping each other. Join them; it only takes a minute: Sign up What is perm space? up vote 61 down vote favorite 22 While learning about java memory profiling, I keep seeing the term "perm space" in addition to "heap." I know what the heap is - what's perm space? java profiling share|improve this question http://stackoverflow.com/questions/1279449/what-is-perm-space asked Aug 14 '09 at 18:35 skiphoppy 25.7k47141190 3 Java 8 has completely removed this concept and moved into Metaspace –pramodc84 Dec 19 '14 at 17:39 add a comment| 7 Answers 7 active oldest votes up vote 71 down vote accepted It stands for permanent generation: The permanent generation is special because it holds meta-data describing user classes (classes that are not part of the Java language). Examples of such meta-data are objects describing classes and methods and they are stored in the Permanent Generation. Applications with large code-base can quickly fill up this segment of the heap which will cause java.lang.OutOfMemoryError: PermGen no matter how high your -Xmx and how much memory you have on the machine. share|improve this answer answered Aug 14 '09 at 18:39 Andrew Hare 216k40500555 add a comment| up vote 14 down vote Perm space is used to keep informations for loaded classes and few other advanced features like String Pool(for highly optimized string equality testing), which usually get created by String.intern(
ProjectsDealsJob BoardJobsJoin UsJCGW4GSubmission GuidelinesTerms & ConditionsAboutAbout JCGsAdvertisingTerms of UsePrivacy Policy Java Code Geeks Java Developers Resource Center AndroidAndroid CoreAndroid GamesJavaCore JavaDesktop JavaEnterprise JavaJVM LanguagesCeylonClojureGroovyJRubyKotlinScalaSoftware DevelopmentAgileCareerCommunicationsDevOpsMeta JCGBest Of The WeekMisc Home » Java » Core Java » Decoding Java.Lang.OutOfMemoryError: PermGen Space About Venkata Kiran Kiran is a product developer working in medical domain. He worked on creating scalable java batch applications and is currently working on developing cross platform mobile applications. His current interests include automated testing of mobile applications. Decoding Java.Lang.OutOfMemoryError: PermGen Space Posted by: Venkata Kiran in Core Java December 5th, 2013 One of the least understood areas by Java Developers is garbage collection. Java Developers feel JVM takes care of garbage collection and they need not worry about memory allocation, deallocation etc. But as the applications grows complex, so does the garbage collection and once it is complex, the performance do get a hit. So it will benefit the Java Developers to understand how garbage collection works and how to fix the ‘Out of Memory' issues in java. There are 2 quite common ‘Out of Memory' issues. The 1st one is ‘Heap Size' and the 2nd one is ‘PermGen Space'.Permanent Generation and ClassLoaders.Java objects are instantiations of the Java classes. Every time a new java object is created, JVM creates an internal representation of that object and stores it in the heap. If the class is accessed for the first time, then it has to be loaded by the JVM. Class loading is the process of locating the corresponding class file, seeking the file on the disk, loading the file and parsing the structure. It is the ClassLoaders responsibility to ensure proper loading of the