Permgen Memory Error
API Home » Java » Understanding and avoiding the Java Permgen Space error 36 Understanding and avoiding the Java Permgen Space error - Steffen Luypaert Share Tweet Posted by Steffen Luypaert on Jul 24, 2011 in Java permgen space tomcat Java Performance PermGen In this article, I look into what it means when a
Permgen Space EclipseJava program runs into a OutOfMemoryError: PermGen Space error. I first explain what the permanent generation heap space is, after which
Error:out Of Memory: Permgen Space Android StudioI explain the usual cause of the Permgen Space error and I give some pointers on how to avoid it. Introduction Usually, we do not look into JVM intrinsics. We take the JVM as is.
Permgen Space WeblogicSome 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 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 permgen space jenkins 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. Without getting into details, Classloaders deploy and undeploy classes all the time. For example, this happens when an application is deployed or undeployed on a webserver. On web servers, all applications have their own Classloader. When an application is deployed or undeployed, its class definitions and Classloader are respectively put into and removed from the permanent generation heap. OutOfMemoryError: PermGen Space The OutOfMemoryError: PermGen Space error occurs when the permanent generation heap is full.
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Support Root Causes java.lang.Outofmemoryerror Java Garbage Collection handbook Handbook menu 8 symptoms Java heap space What is causing it? Give me an example What is the solution? GC overhead limit exceeded What is causing it? Give me an https://plumbr.eu/outofmemoryerror/permgen-space example What is the solution? Permgen space What is causing it? Give me an example What is the solution? Metaspace What is causing it? Give me an example What is the solution? Unable to create new https://www.javacodegeeks.com/2013/12/decoding-java-lang-outofmemoryerror-permgen-space.html native thread What is causing it? Give me an example What is the solution? Out of swap space? What is causing it? What is the solution? Requested array size exceeds VM limit What is causing it? permgen space Give me an example What is the solution? Kill process or sacrifice child What is causing it? Give me an example What is the solution? Download the whole handbook as a 28-page PDF or e-book java.lang.OutOfMemoryError: Permgen space Java applications are only allowed to use a limited amount of memory. The exact amount of memory your particular application can use is specified during application startup. To make things more complex, Java permgen memory error memory is separated into different regions which can be seen in the following figure: The size of all those regions, including the permgen area, is set during the JVM launch. If you do not set the sizes yourself, platform-specific defaults will be used. The java.lang.OutOfMemoryError: PermGen space message indicates that the Permanent Generation's area in memory is exhausted. What is causing it?To understand the cause for the java.lang.OutOfMemoryError: PermGen space, we would need to understand what this specific memory area is used for. For practical purposes, the permanent generation consists mostly of class declarations loaded and stored into PermGen. This includes the name and fields of the class, methods with the method bytecode, constant pool information, object arrays and type arrays associated with a class and Just In Time compiler optimizations. From the above definition you can deduce that the PermGen size requirements depend both on the number of classes loaded as well as the size of such class declarations. Therefore we can say that the main cause for the java.lang.OutOfMemoryError: PermGen space is that either too many classes or too big classes are loaded to the permanent generation. Solution to the problem See how Plumbr's automatic root cause detection helps. Try plumbr Give me an exampleMinimalistic example As we described above,