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Sapienz and SapFix are automated tools that Facebook now uses to find and fix problems across all of the company’s apps Facebook’s Getafix tool serves up templates for how to fix common coding errors to its SapFix system, which then recommends solutions to developers. A null pointer exception is like having the address to a house that was never built. It means a programmer has referred to an object that doesn’t actually exist because it was never described in the code.