详解JVM栈溢出和堆溢出

一、栈溢出StackOverflowError

栈是线程私有的,生命周期与线程相同,每个方法在执行的时候都会创建一个栈帧,用来存储局部变量表,操作数栈,动态链接,方法出口等信息。

栈溢出:方法执行时创建的栈帧个数超过了栈的深度。

原因举例:方法递归

【示例】:

public class StackError {    private int i = 0;    public void fn() {        System.out.println(i++);        fn();    }    public static void main(String[] args) {        StackError stackError = new StackError();        stackError.fn();    }}

【输出】:

解决方法:调整JVM栈的大小:-Xss

-Xss size

Sets the thread stack size (in bytes). Append the letter k or K to indicate KB, m or M to indicate MB, and g or G to indicate GB. The default value depends on the platform:

Linux/x64 (64-bit): 1024 KBmacOS (64-bit): 1024 KBOracle Solaris/x64 (64-bit): 1024 KBWindows: The default value depends on virtual memory

The following examples set the thread stack size to 1024 KB in different units:

-Xss1m-Xss1024k-Xss1048576

This option is similar to -XX:ThreadStackSize.

在IDEA中点击Run菜单的Edit Configuration如下图:

设置后,再次运行,会发现i的值变小,这是因为设置的-Xss值比原来的小:

二、堆溢出OutOfMemoryError:Java heap space

堆中主要存放的是对象。

堆溢出:不断的new对象会导致堆中空间溢出。如果虚拟机的栈内存允许动态扩展,当扩展栈容量无法申请到足够的内存时。

【示例】:

public class HeapError {    public static void main(String[] args) {        List<String> list = new ArrayList<>();        try {            while (true) {                list.add("Floweryu");            }        } catch (Throwable e) {            System.out.println(list.size());            e.printStackTrace();        }    }}

【输出】:

解决方法:调整堆的大小:Xmx

-Xmx size

Specifies the maximum size (in bytes) of the memory allocation pool in bytes. This value must be a multiple of 1024 and greater than 2 MB. Append the letter k or K to indicate kilobytes, m or M to indicate megabytes, and g or G to indicate gigabytes. The default value is chosen at runtime based on system configuration. For server deployments, -Xms and -Xmx are often set to the same value. The following examples show how to set the maximum allowed size of allocated memory to 80 MB by using various units:

-Xmx83886080-Xmx81920k-Xmx80m

The -Xmx option is equivalent to -XX:MaxHeapSize.

设置-Xmx256M后,输入如下,比之前小:

到此这篇关于详解JVM栈溢出和堆溢出的文章就介绍到这了,更多相关栈溢出和堆溢出内容请搜索以前的文章或继续浏览下面的相关文章希望大家以后多多支持!

也许叔本华是对的,人与人的距离太远会寂寞到寒冷,

详解JVM栈溢出和堆溢出

相关文章:

你感兴趣的文章:

标签云: