This PDF is a comprehensive quick-reference guide to frequently used annotations in Java and related technologies. It covers annotations from core Java, JPA, Hibernate, Spring (Core, MVC, REST, Security, Microservices), Spring Boot, Spring Data JPA, Spring WebFlux, Lombok, JUnit, Mockito, Cucumber, Servlets, EJB, JAX-RS (REST), and JAX-WS (SOAP).

The goal of this document is fast revision and easy lookup — perfect for developers who already know the concepts and want a single-page style cheat sheet to refresh their memory quickly. It is not a replacement for detailed learning; for full understanding, it is recommended to study the official Javadocs and documentation alongside real examples.

Key features:

Organized by technology and use-case for quick navigation.
Includes Spring Boot auto-configuration, validation annotations, transactional and testing annotations.
Covers both modern frameworks (Spring REST, WebFlux, Microservices) and legacy Java EE (EJB, Servlets, SOAP, JAX-RS).
Lombok annotations included to simplify boilerplate code understanding.
JUnit, Mockito, and Cucumber annotations included for testing and BDD workflows.

This document is ideal for:

Quick revision before interviews or exams.
Developers learning or switching between Java frameworks.
Experienced programmers needing a refresher on annotations without reading long docs.

Think of it as a concise, portable cheat sheet for all your Java annotation needs.