Jakarta EE, the evolution of Java EE, remains the cornerstone for building robust, scalable enterprise applications in Java. This series offers a structured, hands-on journey through its core specifications, from web-tier fundamentals to advanced enterprise services. Designed for both newcomers and seasoned developers, it provides practical guidance on deploying applications, mastering APIs, and implementing best practices across the full Jakarta EE stack. Below, we explore the key areas covered, each offering tutorials that build real-world skills.
Core Concepts and Platform Fundamentals
The series begins with the essentials: setting up Jakarta EE environments, deploying applications, and understanding the platform's evolution. Articles cover deploying a WAR file to Tomcat, migrating from Java EE to Jakarta EE, and clarifying terminology differences between Java EE, J2EE, and Jakarta EE. You'll also find overviews of naming and directory services, comparisons of web and application servers, and insights into the latest Jakarta EE 10 features. These foundational pieces ensure you have a solid footing before diving into specific APIs.
Servlets and Web Tier
Servlets form the backbone of web request handling. This section introduces Java servlet basics, servlet containers, and their lifecycle. You'll learn to register servlets, manage sessions and cookies, differentiate between redirect and forward operations, return JSON responses, and handle exceptions gracefully. Each article focuses on practical implementation, making it easy to apply these concepts in your projects.
JSP and JSF for View Technologies
For dynamic web content, the series covers JavaServer Pages (JSP) and JavaServer Faces (JSF). Topics include a comprehensive guide to JSP, an introduction to PrimeFaces for rich UI components, and using the JSTL library for common tasks. An MVC example with Servlets and JSP demonstrates the pattern in action, while JSF Expression Language (EL) 2.0 unlocks powerful data binding capabilities.
Web Services: JAX-RS and JAX-WS
Modern applications rely on web services for integration. This section contrasts RESTful and SOAP approaches. For JAX-RS, you'll explore its API, build clients with Jersey, implement filters and interceptors, and handle Server-Sent Events (SSE). JAX-WS coverage includes consuming SOAP web services, an introduction to Apache CXF, and understanding the JAX-WS framework. Practical tips, like setting a response body in JAX-RS, ensure you're ready for common scenarios.
Bean Validation for Data Integrity
Data validation is critical in enterprise systems. Starting with Java Bean Validation basics, the series progresses to constraints like @NotNull, @NotEmpty, @NotBlank, and enums. You'll learn grouping constraints, applying method constraints with Bean Validation 3.0, using @Valid for cascading validation on child objects, and validating lists and container elements. These articles help enforce business rules consistently across layers.
CDI and EJB for Enterprise Components
The final section tackles enterprise services. Introduction to CDI explores dependency injection and lifecycle management. EJB coverage includes setup, session beans (singleton, stateless, stateful), message-driven beans, and Java Transaction API (JTA). An in-depth look at CDI 2.0's event notification model ties it all together, enabling loosely coupled, scalable enterprise applications.
Throughout the series, each article is crafted to be self-contained yet interconnected, allowing you to jump to specific topics or follow sequentially. By the end, you'll have a thorough understanding of Jakarta EE APIs and the confidence to build production-ready applications.