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Why One Developer Built Exception Handling From Scratch Instead of Reusing Old Code

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A software developer chose not to reuse a pre-built exception handler from a previous project after realizing only two of its six exception types were actually used in the new codebase. The existing handler included types like ForbiddenException and InvalidSessionException that belonged to a different system with a different architecture. Instead, the developer built exception handling from the ground up, mapping only the exceptions the business logic actually throws — AuthorizationException to HTTP 403 and IllegalStateException to HTTP 409. The article explains the practical difference between a 401 and 403 status code, noting that sending the wrong one can cause clients to attempt incorrect recovery actions. The approach reflects a broader principle: avoid importing unused code that adds complexity without serving any current feature.

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