monitor jvm memory

Classes are loaded:　　Refers to reading the binary data of a class file into the runtime data area (the JVM is partitioned in memory)and creates a class object within the method area.Class Loader:Responsible for loading the compiled class file (bytecode file) into the JVM (Java Virtual machine).The class loader is mainly divided into the following types:1.Bootstra

Eclipse set JVM memory inThe following error was reported when testing the conversion of a document to a picture in eclipse today: Java.lang.OutOfMemoryError:Java Heap Space As you can see from the exception above, the amount of memory that the JVM needs to use exceeds the maximum

Original article: http://elf8848.iteye.com/blog/467460 There are two common memory overflow types: Java. Lang. outofmemoryerror: permgen Space Java. Lang. outofmemoryerror: Java heap Space 1. java. Lang. outofmemoryerror: permgen Space Permgen space stands for permanent generation space, which is the permanent storage area of the memory,This memory is mainly used

Tomcat itself cannot run directly on a computer. It depends on an operating system based on hardware and a Java virtual machine. When the Java program starts, the JVM allocates an initial memory and the maximum memory to the application. The initial memory and maximum memory

Java Virtual machineJava Virtual machine is a Java file generated by the class file, the class file is the bytecode, the JVM can explain the bytecode becomes the machine code of the target machine, so the Java program can be compiled once and then run around the real implementation of the cross-platform features, The JVM is key in cross-platform features. including our own built-in class files require a vir

In the JVM, memory is divided into two parts, stack (stack) and heap (heap), where we know the stack and heap from the perspective of the memory management principle of the JVM, and these principles recognize the problem of static and static properties in Java.In general, the JVM's

Optimize JVM memory to solve outofmemoryerror From the VM specification, we can see several exceptions.Java. Lang. stackoverflowerror :( very few)Java. Lang. outofmemoryerror: heap space (common)Java. Lang. outofmemoryerror: permgen space (frequently seen) The following are the most common examples: Java. Lang. outofmemoryerror Permgen space is a common exception. It refers to the exception

I. Diagram of the Java Technical System Module Ii. JVM memory Zone Model 1. Method Area It is also called "permanent generation" and "non-heap". It is used to store class information, constants, static variables, and memory areas shared by various threads. The default value is 16 MB and the maximum value is 64 MB. You can use the-XX: permsize and-XX

What is 1.JVM?　　Jvm:java virtual mechinal (Java vm). It is a fictional computer that is implemented by simulating various functions on a real computer. The main task of the JVM is to interpret its own set of instructions (bytecode, such as Java source code compiled into a class file to run on a virtual machine) and map to a local CPU instruction set or system call to the OS. The essence of the cross-platfor

1. Overview Java and C + + there is a dynamic memory allocation and garbage collection technology called the "high Wall", the wall outside people want to go in, the wall inside people but think out. 2. Run-time data region The JVM, while executing a Java program, divides the memory it manages into several different data regions. The following figure: 2.1 Progra

800x600 Normal 0 7.8 lb 0 2 false false en-US ZH-CN x-none Eclipse set JVM memory in Today, in Eclipse, when you test a document into a picture, the following error is reported: Java.lang.OutOfMemoryError:Java Heap Space As you can see from the above exception information, the JVM needs to use more memor