Java本机直接内存溢出

JVM配置

-XX:MaxDirectMemorySize=100M -XX:+HeapDumpOnOutOfMemoryError -XX:+PrintGCDetails

测试代码

package com.example.oom;

import sun.misc.Unsafe;

import java.lang.reflect.Field;

public class DirectMemoryOOM {
    private static int _1MB=1024*1024;

    public static void main(String[] args) throws Exception {
        Field unsafeField= Unsafe.class.getDeclaredFields()[0];
        unsafeField.setAccessible(true);
        Unsafe unsafe=(Unsafe)unsafeField.get(null);
        while (true)
        {
            unsafe.allocateMemory(_1MB);
        }
    }
}

测试结果

Exception in thread "main" java.lang.OutOfMemoryError
    at sun.misc.Unsafe.allocateMemory(Native Method)
    at com.example.oom.DirectMemoryOOM.main(DirectMemoryOOM.java:16)

也没有dump，因为这个不是队内oom