Trần Thanh Hà: Developing web service using JAX-WS

Demo : Happy Consumer International Bank (HCIB), a leading multinational organization having established branches all over the world is now starting its banking services in India. The Bank has employed you as a full time System Consultant with them. It wants to deploy a Web Service that will offer credit card validation and online banking facilities that are typically offered by all the multinational banks. The main priorities for the online banking system are reliability, availability and serviceability of the application. Additionally, the system should be highly scalable and secure as the bank expects substantial growth in the
future. Consider yourself to be a part of the team that implements the credit card validation module. Develop a JAX_RPC based Web Service that exposes the boolean validateCreditCard(cardNumber) method. This method implements the logic for credit card number validation, and returns a boolean value indicating whether the card number is valid or not. Logic for credit card number validation:
Step 1: Multiply the alternate digits of the credit card number by 2 starting with the second digit from the right (the first right--hand digit is the check digit).
Step 2: Add the individual digits comprising the products obtained in Step 1 to each of the unaffected digits in the original number.
Step 3: The sum of all digits obtained after Step 2 as well as unaffected digits must be a number which is a multiple of 10 (30, 40, 50, etc.) for the credit card number to be valid.

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