BadPaddingException Error in RSA enryption/decryption

Answer 1

I assume you are missing this line from the client code:

byte[] cipherText = c.doFinal(msgByte);

Except for that, the most probable error is that servPubKey and serverPrivateKey does not match (i.e. they are not the two halves of the same RSA keypair).

A quick way to check that they match is to print servPubKey.getModulus() and serverPrivateKey.getModulus() and check that they are identical.