Does class Exception have an empty constructor

Question

I thought every class you create in Java automatically creates an empty constructor regardless if you put one or not. I have a piece a class that extends Exception. In order to create a new object of my class using an empty constructor, I have to create it myself, unless I can call Exception's empty constructor.

Answer 1

A default empty constructor will be added to any class in which you don't declare your own constructor. See http://java.sun.com/docs/books/jls/second_edition/html/classes.doc.html#16823
If the body of a constructor does not start with a call to another constructor, via super() or this(), the compiler will automatically add a call to super() at the start of the constructor. See http://java.sun.com/docs/books/jls/second_edition/html/classes.doc.html#78435
I'm guessing you have your own Exception class that has a declared constructor like:
public class MyException extends Exception {
  public MyException(String message) {
    super(message);
}You'll need to add your own empty constructor to this which calls super():
public class MyException extends Exception {
  public MyException() {
    super();
  public MyException(String message) {
    super(message);
}