I didn't get a definitive answer to this question by Google'ing, so I pose it to the groupthink masterminds and to ensure that a quality answer can be Google-able in the future.
Using log4j RollingFileAppender, I can set the maximum size I want the file to reach before rolling over on itself, like so:
RollingFileAppender rfa = new RollingFileAppender();
rfa.setMaximumFileSize(500000000); // Sets the max file size to 500MB
Now, what if I don't ever want this file to be rolled over? How do I set the RollingFileAppender maximum file size to unlimited?