Errors While Developing Versus Errors Months Later

When you have just written code and are running it for the first time, you expect errors. In fact, you may decide to step through code line by line to watch the progress of the code the first time through.

It is another thing to have a program that has been running daily in production suddenly stop working with an error. This seems perplexing; the code has been working for months. Why did it suddenly stop working today?

It is easy to blame this on the client, but when you get right down to it, it is really the fault of developers for not considering the possibilities.

The following sections describe a couple of common problems that can strike an application months later.

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