JVM如何处理StackOverflowError

如何模拟StackOverflowError，可以参考：
http://blog.csdn.net/u011983531/article/details/63250882

我们知道，当虚拟机栈容量太小或者栈帧太大时，程序都会抛出StackOverflowError异常，对于StackOverflowError的处理方法，有下面两种：

1. 通过try…catch(Throwable t){}来捕获，然后跟普通异常一样，对StackOverflowError进行处理
2. 不捕获，然后交给JVM处理，JVM此时会中断当前线程，但是不会影响其他线程，因为虚拟机栈是每个线程私有的

下面，我们分别来模拟一下两种方法：

1.捕获StackOverflowError

public class SOFTest { 
   

    public static void main(String[] args) {
        new Thread(new SOFClass(),"Sub thread").start();
        while (true){
            System.out.println("I am main thread!");
            try {
                Thread.sleep(1000L);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }

    private static class SOFClass implements Runnable{ 
   

        @Override
        public void run() {
            try {
                recursiveMethod();
            }catch (Throwable throwable){
                System.out.println("捕获到了异常："+ throwable.getClass());
            }
            while (true){
                System.out.println("I am sub thread!");
                try {
                    Thread.sleep(1000L);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        }

        public void recursiveMethod(){
            recursiveMethod();
        }
    }
}

//运行结果
I am main thread!
捕获到了异常：class java.lang.StackOverflowError
I am sub thread!
I am main thread!
I am sub thread!
I am main thread!
I am sub thread!
I am main thread!
I am sub thread!

2.JVM处理StackOverflowError

下面，我们不捕获StackOverflowError异常，当我们没有捕获时，异常就交给了JVM去处理了。

public class SOFTest {

    public static void main(String[] args) {
        new Thread(new SOFClass(),"Sub thread").start();
        while (true){
            System.out.println("I am main thread!");
            try {
                Thread.sleep(1000L);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }

    private static class SOFClass implements Runnable{

        @Override
        public void run() {
            recursiveMethod();
       }

        public void recursiveMethod(){
            recursiveMethod();
        }
    }
}

//运行结果
I am main thread!
Exception in thread "Sub thread" java.lang.StackOverflowError
    at com.arch.test.jvm.SOFTest$SOFClass.recursiveMethod(SOFTest.java:37)
    at com.arch.test.jvm.SOFTest$SOFClass.recursiveMethod(SOFTest.java:37)
    at com.arch.test.jvm.SOFTest$SOFClass.recursiveMethod(SOFTest.java:37)
    at com.arch.test.jvm.SOFTest$SOFClass.recursiveMethod(SOFTest.java:37)
    at com.arch.test.jvm.SOFTest$SOFClass.recursiveMethod(SOFTest.java:37)
    at com.arch.test.jvm.SOFTest$SOFClass.recursiveMethod(SOFTest.java:37)
    at com.arch.test.jvm.SOFTest$SOFClass.recursiveMethod(SOFTest.java:37)
    at com.arch.test.jvm.SOFTest$SOFClass.recursiveMethod(SOFTest.java:37)
    at com.arch.test.jvm.SOFTest$SOFClass.recursiveMethod(SOFTest.java:37)
    at com.arch.test.jvm.SOFTest$SOFClass.recursiveMethod(SOFTest.java:37)
    at com.arch.test.jvm.SOFTest$SOFClass.recursiveMethod(SOFTest.java:37)
    at com.arch.test.jvm.SOFTest$SOFClass.recursiveMethod(SOFTest.java:37)
    ……
I am main thread!
I am main thread!
I am main thread!
I am main thread!
I am main thread!
……

我们可以看到，JVM中断了Sub thread，但是主线程仍然在运行，没有影响

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