java虚拟机栈和本地方法栈溢出

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1、HotSpot虚拟机中并不区分虚拟机栈和本地方法栈,
-Xoss参数   设置本地方法栈的大小;
-Xss参数     设置栈容量;
注意:
1、如果线程请求的栈深度大于虚拟机所允许的最大深度,将抛出StackOverflowError异常。
2、如果虚拟机在扩展时无法申请到足够的内存空间,则抛出OutofMemoryError异常。
测试:StackOverflowError
Run configurations参数设置为:-verbose:gc -Xms20M -Xmx20M -Xmn10M -Xss128k
public class JavaVMStackSOF {private int stackLength = 1;public void stackLeak() {stackLength++;stackLeak();}public static void main(String[] args) throws Throwable {try {stackLeak();} catch (Throwable e) {System.out.println("stack length:" + oom.stackLeak());throw e;}}}
运行结果:
stack length:11423
Exception in thread "main" java.lang.StackOverflowError
at test.com.jvm.
at test.com.jvm.
实验结果表明:
在单个线程下,无论是由于栈针太大,还是虚拟机栈容量不足,当内存无法分配的时候,虚拟机就会抛出StackOverflowError;
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模拟OutofMemoryError异常:
run configurations参数:-verbose:gc -Xms20M -Xmx20M -Xmn10M -Xss2M
测试代码如下:
public class JavaVMStackOOM {private void dontStop() {while (true) {}}public void stackLeakByThread() {while (true) {Thread thread = new Thread(new Runnable() {public void run() {dontStop();}});thread.start();}}public static void main(String[] args0) {oom.stackLeakByThread();}}
运行结果:Exception in thread"main" java.lang.OutOfMemoryError:unable to create new native thread


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