一、棧溢出StackOverflowError

棧是線程私有的，生命周期與線程相同，每個方法在執(zhí)行的時候都會創(chuàng)建一個棧幀，用來存儲局部變量表，操作數(shù)棧，動態(tài)鏈接，方法出口等信息。

棧溢出：方法執(zhí)行時創(chuàng)建的棧幀個數(shù)超過了棧的深度。

原因舉例：方法遞歸

【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();
    }
}

【輸出】：

解決方法：調(diào)整JVM棧的大?。?code>-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中點擊Run菜單的Edit Configuration如下圖：

設(shè)置后，再次運行，會發(fā)現(xiàn)i的值變小，這是因為設(shè)置的-Xss值比原來的?。?/p>

二、堆溢出OutOfMemoryError:Java heap space

堆中主要存放的是對象。

堆溢出：不斷的new對象會導(dǎo)致堆中空間溢出。如果虛擬機的棧內(nèi)存允許動態(tài)擴展，當擴展棧容量無法申請到足夠的內(nèi)存時。

【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();
        }
    }
}

【輸出】：

解決方法：調(diào)整堆的大?。?code>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.

設(shè)置-Xmx256M后，輸入如下，比之前小：

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