A common fault that keeps reappearing in API doc comments is an empty <p> tag, which eventually shows up as an error in the HTML checks done in DocCheck.

The typical cause is authors ending a paragraph with <p>, often before a block tag, such as the following

/**
 * This is a comment for a method.
 * This is more descriptive text.
 * <p>
 * @param i this is an argument
 */

This is common enough and easy enough to detect in doclint. It's simply a "start element 'p'" followed by no content at the end of a description.