I have recently gotten a web application from a nasty contractor who claimed to be a good expert in programming. Unfortunately, we believed him. Functional of the web application seemed to work okay at first glance. However, once the client started using application in the real conditions the things went bad. The contractor has gone after a payment, and I have gotten his errors to fix for a client.

I decided to document a few errors that I found along the way. These are errors that every good programmer should already know to avoid… but obviously some people need to be reminded about them.

There are easy and hardly fixable bugs. If the easy bugs could be fixed and forgotten, then the other type of BUGS remains with us forever. I want to share with you 3 such BUGS.

The first bug occurred in 2005 when I worked at the firm of FriendScout24. We had tools for monitoring in which was html tag in every line on the server. If the server responded normally there was green color, if it did not there was red. Usually, it showed all green, and then on one fine day the servers started failing, 4 servers went down for 3 minutes. Then, after 5 minutes everything turned green again, as if nothing had happened.