Rest API Basics

Deserialization Errors in Spring Boot (Causes & Fixes)

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Introduction Deserialization is the reverse of serialization — converting incoming JSON into Java objects. Where serialization problems break your responses, deserialization problems break every client trying to send you data: malformed JSON, unexpected fields, type mismatches, and missing constructors all surface as confusing stack traces at request-parsing time, before your controller code even runs. This […]

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Serialization Problems in Spring Boot (Causes & Fixes)

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Introduction Serialization is the process of converting a Java object into JSON before it leaves your Spring Boot API. It looks automatic — until it isn’t: infinite recursion on bidirectional JPA relationships, lazy-loading exceptions from Hibernate proxies, wrong date formats, or fields silently missing from the response. Most serialization bugs share a single root cause

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Fix Spring Boot CORS Error (Angular / React) — Production-Safe Guide

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CORS (Cross-Origin Resource Sharing) errors are one of the most persistent and confusing issues developers face when integrating modern frontend frameworks like Angular and React with a Spring Boot backend. You may see errors such as: Or: These are not Spring errors — they’re browser security mechanisms rejecting your call because it violates same-origin policy.

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Request Lifecycle in Spring Boot (From Client to Response)

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Understanding the full request lifecycle in Spring Boot—from the moment a client makes an HTTP request to the moment a response is sent—is one of the most powerful frameworks concepts you can master. Most developers learn controllers and services, but not the plumbing that makes REST APIs work reliably in real systems. This guide walks

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REST API Basics in Spring Boot (Production-Ready Guide)

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REST APIs are the backbone of modern web and microservice architectures.Spring Boot makes building REST APIs straightforward, but to use them in real systems, you must understand not just what to annotate — but why and how it works end-to-end. This guide explains REST APIs in Spring Boot with production-grade clarity, covering request routing, status

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