OnJava8-Examples/exceptions/Rethrowing.java

// exceptions/Rethrowing.java
// <20>2016 MindView LLC: see Copyright.txt
// We make no guarantees that this code is fit for any purpose.
// Visit http://mindviewinc.com/Books/OnJava/ for more book information.
// Demonstrating fillInStackTrace()

public class Rethrowing {
  public static void f() throws Exception {
    System.out.println("originating the exception in f()");
    throw new Exception("thrown from f()");
  }
  public static void g() throws Exception {
    try {
      f();
    } catch(Exception e) {
      System.out.println("Inside g(), e.printStackTrace()");
      e.printStackTrace(System.out);
      throw e;
    }
  }
  public static void h() throws Exception {
    try {
      f();
    } catch(Exception e) {
      System.out.println("Inside h(), e.printStackTrace()");
      e.printStackTrace(System.out);
      throw (Exception)e.fillInStackTrace();
    }
  }
  public static void main(String[] args) {
    try {
      g();
    } catch(Exception e) {
      System.out.println("main: printStackTrace()");
      e.printStackTrace(System.out);
    }
    try {
      h();
    } catch(Exception e) {
      System.out.println("main: printStackTrace()");
      e.printStackTrace(System.out);
    }
  }
}
/* Output:
originating the exception in f()
Inside g(), e.printStackTrace()
java.lang.Exception: thrown from f()
        at Rethrowing.f(Rethrowing.java:7)
        at Rethrowing.g(Rethrowing.java:11)
        at Rethrowing.main(Rethrowing.java:29)
main: printStackTrace()
java.lang.Exception: thrown from f()
        at Rethrowing.f(Rethrowing.java:7)
        at Rethrowing.g(Rethrowing.java:11)
        at Rethrowing.main(Rethrowing.java:29)
originating the exception in f()
Inside h(), e.printStackTrace()
java.lang.Exception: thrown from f()
        at Rethrowing.f(Rethrowing.java:7)
        at Rethrowing.h(Rethrowing.java:20)
        at Rethrowing.main(Rethrowing.java:35)
main: printStackTrace()
java.lang.Exception: thrown from f()
        at Rethrowing.h(Rethrowing.java:24)
        at Rethrowing.main(Rethrowing.java:35)
*/