按书上写了一段java捕获异常的代码，不知道问题出在哪里

源代码如下：
package com.Sixping.Ncre;

public class Rethrow {
public static void rt() throws Exception {//定义方法，抛出Exception类的异常
System.out.println("old exception in rt()");
throw new Exception("thrown from rt()");
}
public static void wq() throws Throwable {//定义方法，调用rt(),捕获rt()抛出的异常
try {
rt();
} catch (Exception e) {
System.out.println("Inside wq(),e.printStackTrace():");
e.printStackTrace(); //输出堆栈使用情况
throw e; //重新抛出异常
}
}
public static void main(String[] args) throws Throwable {
try {
wq(); //产生被重新抛出的对象
} catch (Exception e) {
System.out.println("Caught in main,e.printStackTrace():");
e.printStackTrace(); //再次输出堆栈信息
}
}
}

运行报错如下：
old exception in rt()

java.lang.Exception: thrown from rt()
at com.Sixping.Ncre.Rethrow.rt(Rethrow.java:6)
at com.Sixping.Ncre.Rethrow.wq(Rethrow.java:10)
at com.Sixping.Ncre.Rethrow.main(Rethrow.java:19)
java.lang.Exception: thrown from rt()
at com.Sixping.Ncre.Rethrow.rt(Rethrow.java:6)
at com.Sixping.Ncre.Rethrow.wq(Rethrow.java:10)
at com.Sixping.Ncre.Rethrow.main(Rethrow.java:19)
Inside wq(),e.printStackTrace():
Caught in main,e.printStackTrace():

求大神解答