MAT Memory Analyzer Tool plugin installation (illustrated)

@author YHC

Some time ago did a project, Exception in thread "main" Java.lang.OutOfMemoryError:Java heap

This error occurs, so you need to find the reason, so use this tool, installation is more troublesome, posted out and share with you:

First step: Download Eclipse MAT

Download Address: http://www.eclipse.org/mat/downloads.php

The second step: after downloading the compressed package decompression, placed into the MyEclipse \myeclipse 9\dropins directory

after decompression, you will see these files: Correct one of the following typos is not "write" is "down"

The third step: according to the following figure, a,b,c the order of the corresponding file creation

Part fourth: Restart MyEclipse, open window->perferences, you will see this project:

To put it simply, use (console) if it is Tomcat or another server you need to find out how to configure JVM parameters:

Here is a program code that will cause Java.lang.OutOfMemoryError:Java heap space: (Very easy)

Package org.lx.test;

Import java.util.Date;
Import Java.util.HashMap;
Import Java.util.Map;

public class Outofmemorytest {public
	static void Main (string[] args) {
		map<integer,date> map=new hashmap& Lt;integer, date> ();
		for (int i = 0; i < 600000000 i++) {
			map.put (i, New Date ());}
		}
	
	

First, some parameters need to be set before running:

Then on the page of the parameter settings, set the parameters in A,b order: (-xx:+heapdumponoutofmemoryerror) Avoid writing errors can be copy

The program code that runs the error will see the following results:

Then it generates a file java_pid3708.hprof, which is in the root directory of your project (MYECLIPSE10)

So then we'll open this file to analyze how to open the following figure: (Select the file you just generated in the project root java_pid3708.hprof Open)

When you open it, you will see that the following image is OK:

As for the question of how to find, please refer to the following connection:

The following article has been said in great detail:

1. Using Eclipse Memory Analyzer for heap dump file analysis

2. Using Mat for dump file analysis

If you have any questions, please correct me.