Chained exception example in Java

//  Program to explain Chained Exception.
class  ChainedException
{
static void demoproc() 
{
 NullPointerException e = new NullPointerException("top layer");
 e.initCause(new ArithmeticException("cause"));
 throw e;
}
public static void main(String args[ ]) 
{
 try 
 {
  demoproc();
 } 
 catch(NullPointerException e) 
 {
  System.out.println("Caught: " + e);
  System.out.println("Original cause: " + e.getCause());
 }
}
}

Output:
Caught: java.lang.NullPointerException: top layer
Original cause:  java.lang.ArithmeticException: cause