Demonstrate exception chaining. : Exception « Development « Java Tutorial

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2. Development
3. Exception

class ChainExcDemo {
  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());
    }
  }
}