The Art of Debbuging

By Computer Geeks -

The 4W Technique

From my perspective that we can solve any bugs by asking these four questions

  • When
  • What
  • Where
  • Why

When?

  • When a bug or issue arises is the first question.
  • In which scenario or test case does the bug occurs.
  • First, we have to identifying the scenario.
  • Then, confirm the scenario by repeating same case several time or similar case several time.

What?

  • What is the desired output what is the program output?
  • Simply what is your end goal?

Where?

  •  Where is the skewing occurs from the desired path.
  •  Where the processing input gets modified to something not intended or remains unchanged when it should have been processed.
  •  Or In case of error, Where is the exception or error occurs?
    • In java which class -> function -> line does the error occurs?
    • It can be identified from error stack trace.

Why?

  • At last the most crucial part, Why it occurs ??
  • Why whatever happens, happens?
  • If you find out why it occurs you can most possible solve it.
    • If there is an exception there may be validation problem. So we can validate for the particular case.
    • If there is some processing left undone, finish it.
End Note:
 
According to Murphy's law "Anything that can go wrong will go wrong". So, don't sweat it. 
 
PS: It is not a standard scientific method. But this is what I do to solve the problem.

That's it!

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