🚀 Spring Boot Tutorials
This page collects all Spring Boot articles from Spring Java Lab in one place. Start with REST basics (controllers, JSON responses, annotations), then move on to real-world topics like global exception handling, CRUD APIs with databases, and file upload + download. Many examples also integrate with Spring Batch for backend processing.
🧩 Core Spring Boot REST APIs
🔀 @Controller vs @RestController
Understand the difference between @Controller and @RestController in Spring Boot with
examples of MVC views vs pure JSON REST APIs.
📤 Returning JSON from REST APIs
Learn how Spring Boot converts Java objects to JSON, how to use @ResponseBody, and how to control
HTTP status codes and response structure.
🏷️ REST API Annotations Cheat Sheet
Quick reference for important REST annotations like @GetMapping, @PostMapping,
@RequestBody, @PathVariable, and more.
🌐 Global Exception Handling
Use @ControllerAdvice and @ExceptionHandler to return consistent error JSON from all
your Spring Boot REST controllers.
✅ REST API Validation Annotations
Validate request bodies using Bean Validation annotations like @NotNull, @NotBlank, @Size, and @Valid in Spring Boot REST APIs.
🧩 Custom Validation Annotations
Create custom validation annotations using ConstraintValidator for advanced business rules in Spring Boot applications.
⚙️ Threading & Async Execution
Understand how Spring Boot manages threads, executors, @Async, and how it interacts with modern Java concurrency.
🗄️ Spring Boot with Database, File Upload & Batch
📂 File Upload + Download + DB
Build a Spring Boot REST API to upload files with MultipartFile, store them as BLOBs in
MySQL / Oracle, and download them back with proper content type.
🛠️ CRUD API with Oracle Database
Step-by-step guide to build a Spring Boot CRUD REST API using JPA and Oracle DB, including entity, repository, service and controller layers.
🧱 Spring Boot JPA Basics
Introduction to Spring Data JPA covering entities, repositories, transactions, and basic CRUD operations.
📄 Pagination & Sorting with JPA
Implement pagination and sorting using Pageable and Sort in Spring Data JPA-based Spring Boot applications.
🔍 Sorting & Filtering with Specifications
Build dynamic filtering and sorting APIs using JPA Specifications and Criteria API in Spring Boot.
🚀 Performance Tuning & Optimization
Optimize Spring Boot applications by tuning JVM, database access, connection pools, and REST layer performance.
🗄️ Database Performance Tuning
Improve database performance in Spring Boot using indexing, query optimization, batching, and caching techniques.
🧠 Redis Cache Optimization
Use Redis caching in Spring Boot to reduce database load and improve response time for high-traffic APIs.
📊 Mastering Spring Boot Actuator
Monitor and manage Spring Boot applications using Actuator endpoints, health checks, and metrics.
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