title: Encrypting NULL
body: <p>While using <code>Javax.crypto</code> ciphers (more specific <code>AES128/CBC/PKCS5Padding</code>), the <code>doFinal</code> throws a <code>NullPointerException</code> when passing <code>null</code> to it as method args. </p>
  
  <p>Is there a way to encrypt <code>null</code> so that when persisting it to the database, I don't store <code>null</code> as <code>null</code> or something similar?</p>