grant codebase "file:${java.home}/../lib/tools.jar"{
    permission java.security.AllPermission;
};

package com.ajupiter;

import java.util.ArrayList;

public class Entity {
    ArrayList<String> arrayList;
    String name;
    int age;

    public Entity(String a, int b) {
        name = a;
        int len = 100;
        arrayList = new ArrayList<String>(100);
        for (int i = 0; i < len; i++) {
            arrayList.add("thisi is no. " + i);
        }
        age = b;
    }
}

package com.ajupiter;

import java.util.Date;
import java.util.HashMap;
import java.util.Map;

//测试产生OOM错误，实际最大运行时间约30s，但一般会因为产生OOM错误提前结束
public class OOMProducer {

    public void oom() throws InterruptedException {
        int len = 30000;
        Object[] array = new Object[len];
        for (int i = 0; i < len; i++) {
            String d = new Date().toString();
            Entity p = new Entity(d, i);
            Map<Integer, Entity> map = new HashMap<>();
            map.put(i, p);
            array[i] = p;
            Thread.sleep(1);
        }
    }
}

package com.ajupiter;

public class Main {

    public static void main(String[] args) {
        OOMProducer oomProducer = new OOMProducer();
        try {
            oomProducer.oom();
        } catch (InterruptedException e) {
            System.out.println("出现错误");
            e.printStackTrace();
        }
    }
}