InvalidKeySpecException y = new InvalidKeySpecException(); y.initCause(x); throw y;
throw new InvalidKeySpecException(x.getMessage(), x);
  private static Class getConcreteClass(String className)      throws InvalidKeySpecException  {    try      {        Class result = Class.forName(className);        return result;      }    catch (ClassNotFoundException x)      {        InvalidKeySpecException y = new InvalidKeySpecException();        y.initCause(x);        throw y;      }  }