Logging all API call traffic in Java servlets
private static final Logger LOG = LoggerFactory.getLogger(CommentServlet.class);


This is considered as bad practice ... of course there is an argument from the other side as well.

The right thing to use should be 

private final Logger LOG = LoggerFactory.getLogger(getClass()); 


This basically helps you leverage the capabilities of polymorphism and use the same logger in inherited classes with its real name.