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Solve JVM memory overflow and jvm memory overflow Today I encountered a problem. When I restarted Tomcat 6 when adding the configuration file (*. xml) content, the console reported the error: java. lang. StackOverflowError; That is, stack overflow error. Memory overflow occurs when the memory used by the program is larger than the maximum memory provided by the virtual machine. Memory overflow depends on

JVM tuning-New Generation and jvm tuning New Generation A new generation of Java virtual machines, including eden space and two dedicated vor spaces. The new generation is used to store newly created objects. The new generation features fast object updates and produces a large number of "Dead objects" in a short time ". Garbage collection for young generations is called secondary garbage collection (minor

In this section we summarize the memory allocation policy in the JVM. The directory is as follows: Memory allocation policyObject first in New Generation Eden AssignmentLarge objects go straight into the old ageLong-lived objects will enter the old age.Dynamic Object Age DeterminationSpace allocation guaranteed memory allocation policyThe automatic memory management advocated in the Java technology system can be attributed to two parts: allocating mem

Difference between heap memory and stack memory in JVM, and between jvm heap memory Java divides memory into two types: stack memory and stack memory. TheSome basic types of variables and Object Reference variables are allocated in the function stack memory.. When a variable is defined in a code block, java allocates memory space for the variable in the stack. When the scope of the variable is exceeded, jav

JVM learning-runtime data zone and jvm learning data Zone Unlike C and C ++ programs, the memory management of Java programs is taken over by the java Virtual Machine (JVM), which reduces the burden on Java programmers, however, if an OutOfMemory or StackOverFlow Exception error occurs, it is difficult to locate the error quickly if you do not know the memory man

Impact of Direct Memory on jvm, jvm memory Direct Memory Direct Memory is an important issue. First, it is neither a part of the running data zone nor a part of the Java Virtual Machine specification. This issue is mainly related to NIO after java1.4, an I/O Method Based on channels and buffers. It can use the Native function library to directly allocate off-heap memory, then, you can use the DirectByteBu

Chapter 5 JVM garbage collector (1): jvm garbage collection (The garbage collection algorithm is a theory, and the garbage collector is a collection algorithm. For details about the collection algorithm, see Chapter 4 JVM garbage collection algorithm.) 1. Seven garbage collectors Serial (Serial GC) ParNew (parallel GC) Parallel Scavenge (Parallel GC collectio

[Switch] Error: no 'server' JVM at 'C: \ Program Files \ Java \ jre6 \ bin \ server \ jvm. dll '. Solution: jre6jvm. dll Problem:Error prompted with java-jar XXX. jar-server-Xms900m-Xmx900m or java-server-versionError: no 'server' JVM at 'C: \ ProgramFiles \ Java \ jre6 \ bin \ server \ jvm. dll '.. SolutionCopy 'serv

Jvm-parent Delegation Model, jvm-parent Delegation Interview Questions Can I write a class called java. lang. System? Answer: Generally, this is not acceptable, but an alternative method can be used to meet this requirement.Explanation: in order not to allow us to write System Classes, class loading adopts a delegation mechanism, which ensures that the class members are given priority and the class members

-xss128k: This JVM parameter is used to configure the stack size to 128kBecause the stack is thread-private (it is unclear to understand the structure of the JVM virtual machine), the exception is generated if we start a thread and call a recursive in the thread./** * VM args:-xss128k * */public class Javavmstacksof {private int stacklength = 1;public void Stackleak () {Stackleng Th++;stackleak ();} publi

) Client VM (build 14.3-b01,mixed mode, sharing)Mixed mode explains and compiles the mixed execution mode by default using this patternjava-xint-versionJava HotSpot (TM) Client VM (build 14.3-b01,interpreted mode, sharing)Interpreted pure Interpretation mode disables JIT compilationjava-xcomp-versionJava HotSpot (TM) Client VM (build 14.3-b01,compiled mode, sharing)Compiled pure compilation mode (fallback to interpreted mode to perform a method that cannot be compiled if the method cannot compil

[JVM] template interpreter-how to generate Assembly codes based on bytecode ?, Jvm Interpreter 1. Background Template interpreter for JVM only: How to generate an assembly code based on the opcode and addressing mode. For the bytecode and sink encoding used in this example, see the previous blog post: pass by value or by reference? 2. Addressing Mode This art

JVM tuning-calculate the active data size and jvm tuning Active Data Active Data, sometimes called survival data, refers to the size of long-lived objects in the Java heap when the application is in stable running state. In other words, the space occupied by the Java heap after FullGC in the stable running state of the application (memory usage ). 1. Importance of active data computing The calculation of t

As we all know, the JVM used to be interpreted in the past, but later in the history of the revision also added to the implementation of the compilation. So in general the JVM is comprised of interpretation execution and compilation execution. This part does not belong to the scope of the JVM, has been compiled, most of them are lexical analysis and the like, the

JVM class loading mechanism ---- 2. jvm Loading Mechanism The first phase of the class loading mechanism is: 1. Use a fully qualified Class name (package name and Class Name) to obtain the binary byte stream (Class file) that defines this Class ). You can use the jar package, war package, network retrieval, and JSP file generation methods. 2. Convert the static storage structure represented by this byte st

Jvm memory growth troubleshooting examples and jvm troubleshooting examplesTroubleshoot jvm memory Growth Troubleshoot the problem that the jvm memory usage continues to increase. record it and take it as a warning. The O M team found that the jvm memory usage of the applic

Jvm running data distribution and jvm Data Distribution I have a deep understanding of jvm (java se7 of this version) Data Area During java Runtime When executing a java program, the java Virtual Machine divides the memory into several different stages and has different time. Different purposes First Program counter: A small memory space in the

JVM garbage collection algorithm and jvm garbage collection 1. Reference Counting Collector) The reference counting algorithm is a simple but inefficient algorithm. Its main principle is as follows: each object in the heap has a reference counter; when the object is referenced, add 1 to the reference counter; when the referenced object is left empty or out of scope, the reference counter minus 1. This metho

Garbage collection in Jvm and Jvm garbage collection I. Concept of garbage collection Memory collection in Java is the memory collection during Jvm runtime. The areas to be recycled include the method area and Java heap. Because of program counters, Java Virtual Machine stacks and local method stacks are automatically recycled at the end of methods or threads, so

JVM review notes and jvm Review -- Take it easy Garbage collection: Young generation ------- serial, parnew, parallel scavengeTenured gencration --------- CMS, Serial old (MSC), parallel old.The parallel scavenge collector is a new generation collector that uses apparel algorithms and parallel multi-thread collectors.It looks like parnew. What's special?-- The characteristics of parallel scavenge collecto