🔸 TLDR

▪️ Use ProblemDetail to return consistent, machine-readable errors (status + title + detail + type + extra fields) ✅

🔸 CONTEXT

▪️ APIs often return random error shapes: sometimes {message}, sometimes {error}, sometimes HTML 😅

▪️ Clients hate guessing. Observability hates inconsistency.

▪️ ProblemDetail gives you a standard error contract (Problem Details for HTTP APIs — RFC 9457).

🔸 Snippet: custom 404 (ProblemDetail + @RestControllerAdvice)

🔸 Snippet: validation errors (return a list of field issues)

🔸 Takeaways

▪️ Standardize your error shape → clients stop “parsing strings” 🧠

▪️ Set type to a stable doc URL → self-explaining API 🔗

▪️ Add safe custom fields via setProperty(...) (traceId, errorCode, errors[]) 🧾

▪️ Don’t leak internals (stacktraces / SQL / secrets) 🔒

▪️ Centralize with @RestControllerAdvice for consistency ⚙️

#SpringBoot #SpringFramework #Java #API #REST #ErrorHandling #ProblemDetail

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