2 posts tagged with "error-handling"

"Why is my API returning HTML error pages?!" I stared at my console in disbelief. My React frontend was trying to parse JSON, but Spring Security was happily serving up a Whitelabel Error Page for failed authentication attempts. This took me 3 hours to fix. Let me show you how to make Spring Security play nice with modern frontends. 🎨✨

"Why create InvalidCredentialsException extending RuntimeException? Isn't it just to get a descriptive name instead of generic RuntimeException?" No! The name is only a small part. The real power is type-safe error handling - allowing Spring to distinguish between different errors and handle them differently without string parsing. Let's see why custom exceptions are essential, not just fancy naming.