Development how-tos
General development how-to guides
Tips and tricks
Filter the log file
The log file can be very helpful while developing - but it contains so much information that it might be too much. Often it makes sense to filter the log a bit.
Example:
tail -f catalina.out | grep -v --line-buffered --invert-match "^\t\(at\|\.\.\.\) "
# --line-buffered option makes grep work on a line-by-line basis