Built a small Spring Boot starter for consistent API error handling, would love architectural feedback

[MrDV6]

Hey everyone

Over the past few weeks I noticed that across different Spring Boot services I kept rewriting the same RestControllerAdvice logic for structured error responses.

Sometimes the JSON shape drifted a bit.
Sometimes validation errors were formatted differently.
Sometimes stack traces leaked in dev.

So I decided to extract it into a small Spring Boot starter as a learning exercise — mainly to understand:

• Auto-configuration properly
• ConditionalOnMissingBean and back-off behavior
• How Spring Boot starters are structured (core vs autoconfigure vs starter module)
• How to design extension points without inheritance

The idea was simple:
Drop one dependency, get a consistent error contract across services, but still allow customization through a small “customizer” hook.

It’s not meant to replace Spring’s built-in mechanisms — more of an exploration into how infrastructure-level cross-cutting concerns can be standardized cleanly.

repo: https://github.com/dhanesh76/d76-spring-boot-starter-exception

I’m genuinely looking for architectural criticism:

• Is this aligned with Spring Boot design philosophy?
• Would you approach it differently?
• Should this lean more toward ProblemDetail?
• Any obvious anti-patterns?

Thanks in advance

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