当PermGen已满时,Glassfish有时无法停止,在这种情况下,asadmin stop-domain domain1不起作用.在Glassfish 2.1.1中它会永远坐在那里;在3.x中,它在AS_ADMIN_READTIMEOUT之后超时.所以我现在正在研究我的Glassfish停止脚本,它将在一定的超时后杀死/杀死它 – 以确保它被停止.

为了完全测试这个,我需要重现这个PermGen完整场景.我怎么刻意填写PermGen？我现在正在使用Java 1.7.0_45,如果这很重要的话.我写了一个程序来填满堆,但对我来说这是一个新的程序,我想我会转向SO.它可能更棘手(不确定)它需要是什么(.war？)我可以部署到GF.感谢任何帮助,非常感谢.

解决方法:

我有东西给你.我不知道如何在这里上传jar文件,所以只需在这里添加文件.

方法：ClassGenerator类在while循环中创建一个新的类加载器,并反复加载相同的类,直到它用完permgen.现在您将注意到有一个列表可以保存已加载类的引用.那是为了防止JVM卸载这些类:).

文件说明

第一张图显示,当您运行程序时,它会耗尽permgen空间.如果要在eclipse中设置它,则第二个图像显示项目的结构.我在eclipse中测试它并将其导出为可运行的jar文件,它在两种情况下均可用.

作为一个可运行的jar文件运行,它用完了permgen.

ClassGenerator类

package com.vkg;

import java.io.ByteArrayOutputStream;

import java.io.IOException;

import java.io.InputStream;

import java.util.ArrayList;

import java.util.List;

public class ClassGenerator {

private static final int BUFFER = 1024;

private List> classList = new ArrayList>();

public static void main(String[] args) {

ClassGenerator classGenerator = new ClassGenerator();

// Load just some class with class loaders until perm gen space fills.

while (true) {

classGenerator.classLoader();

}

}

private void classLoader() {

ClassLoader classLoader = new ClassLoader() {

public Class> loadClass(String classNameWithPackage)

throws ClassNotFoundException {

if (!classNameWithPackage.contains("DummyClass")) {

return super.loadClass(classNameWithPackage);

}

String className = classNameWithPackage.replace('.', '/')

+ ".class";

byte[] classData = null;

InputStream inputStream = null;

try {

inputStream = getResourceAsStream(className);

byte[] buffer = new byte[BUFFER];

ByteArrayOutputStream outputStream = new ByteArrayOutputStream();

int bytesRead = -1;

while ((bytesRead = inputStream.read(buffer, 0, BUFFER)) != -1) {

outputStream.write(buffer, 0, bytesRead);

}

classData = outputStream.toByteArray();

} catch (IOException e) {

e.printStackTrace();

} finally {

if (inputStream != null) {

try {

inputStream.close();

} catch (Exception e) {

e.printStackTrace();

}

}

}

Class> c = defineClass(classNameWithPackage, classData, 0,

classData.length);

resolveClass(c);

System.out

.println("Steve I am loading another copy of Dummy class. Soon Permgen will fill.");

classList.add(c);

return c;

}

};

try {

Class.forName("com.vkg.DummyClass", true, classLoader);

} catch (ClassNotFoundException e) {

e.printStackTrace();

}

}

}

虚拟课.这可以是任何类.这个类的唯一目的是获得大量加载.没有其他用途.没有逻辑从这个类执行.主要逻辑在ClassGenerator.java中

package com.vkg;

import java.io.ByteArrayOutputStream;

import java.io.IOException;

import java.io.InputStream;

public class DummyClass {

public void classLoader() {

ClassLoader classLoader = new ClassLoader() {

public Class> loadClass(String classNameWithPackage) throws ClassNotFoundException {

if(!classNameWithPackage.contains("DummyClass")) {

return super.loadClass(classNameWithPackage);

}

String className = classNameWithPackage.replace('.', '/') + ".class";

byte[] classData = null;

try {

InputStream inputStream = getResourceAsStream(className);

byte[] buffer = new byte[1];

ByteArrayOutputStream outputStream = new ByteArrayOutputStream();

int bytesRead = -1;

while ((bytesRead = inputStream.read(buffer, 0, 1)) != -1) {

outputStream.write(buffer, 0, bytesRead);

}

classData = outputStream.toByteArray();

}

catch (IOException e) {

e.printStackTrace();

}

Class> c = defineClass(classNameWithPackage, classData, 0, classData.length);

resolveClass(c);

System.out.println("Steve I am loading another copy of Dummy class. Soon Permgen will fill.");

return c;

}

};

try {

Class.forName("com.vkg.DummyClass", true, classLoader);

} catch (ClassNotFoundException e) {

e.printStackTrace();

}

}

}

希望它可以帮助您测试服务器崩溃.

标签：java,permgen,glassfish

来源： https://codeday.me/bug/20190528/1174063.html