Worst Java practice found in your experience?
<p>Similar to <a href="http://stackoverflow.com/questions/233030/worst-php-practice-found-in-your-experience">this question</a>...</p>

<p>What are the worst practices you actually found in Java code?</p>

<p>Mine are:</p>

<ul>
<li>using instance variables in servlets (it's not just bad practice but bug, actually)</li>
<li>using Collection implementations like HashMap, and not using the appropriate interfaces</li>
<li>using seemingly cryptic class names like SmsMaker (SmsFactory) or CommEnvironment (CommunicationContext)</li>
</ul>
