Jakarta EE Series
Last updated: June 4, 2026
Mocking is an essential part of unit testing, and the Mockito library makes it easy to write clean and intuitive unit tests for your Java code.
Get started with mocking and improve your application tests using our Mockito guide:
Handling concurrency in an application can be a tricky process with many potential pitfalls. A solid grasp of the fundamentals will go a long way to help minimize these issues.
Get started with understanding multi-threaded applications with our Java Concurrency guide:
Spring 5 added support for reactive programming with the Spring WebFlux module, which has been improved upon ever since. Get started with the Reactor project basics and reactive programming in Spring Boot:
Since its introduction in Java 8, the Stream API has become a staple of Java development. The basic operations like iterating, filtering, mapping sequences of elements are deceptively simple to use.
But these can also be overused and fall into some common pitfalls.
To get a better understanding on how Streams work and how to combine them with other language features, check out our guide to Java Streams:
Explore Spring Boot 3 and Spring 6 in-depth through building a full REST API with the framework:
Yes, Spring Security can be complex, from the more advanced functionality within the Core to the deep OAuth support in the framework.
I built the security material as two full courses - Core and OAuth, to get practical with these more complex scenarios. We explore when and how to use each feature and code through it on the backing project.
You can explore the course here:
Spring Data JPA is a great way to handle the complexity of JPA with the powerful simplicity of Spring Boot.
Get started with Spring Data JPA through the guided reference course:
Refactor Java code safely — and automatically — with OpenRewrite.
Refactoring big codebases by hand is slow, risky, and easy to put off. That’s where OpenRewrite comes in. The open-source framework for large-scale, automated code transformations helps teams modernize safely and consistently.
Each month, the creators and maintainers of OpenRewrite at Moderne run live, hands-on training sessions — one for newcomers and one for experienced users. You’ll see how recipes work, how to apply them across projects, and how to modernize code with confidence.
Join the next session, bring your questions, and learn how to automate the kind of work that usually eats your sprint time.
Jakarta EE (formerly Java EE) is the standard enterprise Java platform, providing a comprehensive set of specifications for building scalable, multi-tier server-side applications. It covers the full stack from web tier components like Servlets and JSP to enterprise services like CDI and EJB, along with robust support for RESTful and SOAP web services.
This series covers core Jakarta EE APIs in practical application, organized by concern: from setting up and deploying applications on Jakarta EE servers, through building the web tier with servlets and view technologies, designing service layers with JAX-RS and JAX-WS, enforcing contracts with Bean Validation, and managing enterprise components with CDI and EJB.
Jakarta EE Platform and Core Concepts
- How to Deploy a WAR File to Tomcat
- Migrate From Java EE to Jakarta EE
- Java Naming and Directory Interface Overview
- Java EE vs J2EE vs Jakarta EE
- Web and Application Servers for Java
- Jakarta EE 10
Servlets
- Introduction to Java Servlets
- Handling Cookies and a Session in a Java Servlet
- Introduction to Servlets and Servlet Containers
- How to Register a Servlet in Java
- Servlet Redirect vs Forward
- Returning a JSON Response from a Servlet
- Jakarta EE Servlet Exception Handling
JSP and JSF
- Guide to JavaServer Pages (JSP)
- Introduction to Primefaces
- A Guide to the JSTL Library
- An MVC Example with Servlets and JSP
- Introduction to JSF EL 2
Web Services: JAX-RS and JAX-WS
- Consume a SOAP Web Service in Java
- JAX-RS is just an API!
- Introduction to JAX-WS
- Introduction to Apache CXF
- JAX-RS Client with Jersey
- Jersey Filters and Interceptors
- Server-Sent Events (SSE) in JAX-RS
- Set a Response Body in JAX-RS
Bean Validation
- Java Bean Validation Basics
- Difference Between @NotNull, @NotEmpty, and @NotBlank Constraints in Bean Validation
- Validations for Enum Types
- Grouping Jakarta (Javax) Validation Constraints
- Method Constraints with Bean Validation 3.0
- @Valid Annotation on Child Objects
- Java Validation List Annotations
- Validating Container Elements with Jakarta Bean Validation 3.0
CDI and EJB
