java

TDD & JUnit: Quality in Java

Secure your code quality by mastering TDD and JUnit 5 for modern Java applications.

Expected Outcome

Gain an efficient testing workflow making your code more stable and easier to maintain.

Target Audience

For teams wanting to minimize bugs and create a sustainable test strategy in modern Java.

Prerequisites

Java experience is required, but no prior knowledge of unit testing or JUnit is expected.

Curriculum & Highlights

→ JUnit 5 Core & Assertions

→ TDD: Red-Green-Refactor

→ Structuring Test Classes

→ Isolating Dependencies

→ Design for Testability

→ Test Lifecycle & Hooks

→ Java 21 & 25 Test Patterns

Challenges we address

"How do you set up and structure effective unit tests with JUnit 5?"

"How do you use Red-Green-Refactor to let tests drive the design of your code?"

"What are the best ways to write tests that are easy to understand and maintain?"

Detailed Description

Poor test coverage often leads to expensive regressions and a fear of changing existing code, stifling innovation and slowing down projects. Testability is not just an afterthought—it is a measure of good architecture and requires a specific methodology to be successful in complex Enterprise systems. Through the Red-Green-Refactor cycle, I teach how tests drive design forward using Active Learning. We use JUnit 5 to create fast and clear unit tests that provide immediate feedback during development. We create a secure development environment where quality and speed go hand in hand for the entire team in your daily work. We dive deep into the JUnit 5 Jupiter API to structure test suites that are easy to maintain and serve as living documentation. By implementing isolated unit tests with Mockito and mastering lifecycle methods (Hooks), we minimize dependencies and adhere to SOLID principles for testable architecture. We address test design challenges by letting tests drive code development, ensuring every logic flow is verified and prepared for future refactoring in modern Java 21 and 25. Actlea's core philosophy is that testability is the most reliable indicator of sound architectural health. Experience demonstrates that TDD is not merely about finding bugs, but about enforcing a modular and loosely coupled design ready for rapid change in 2026. By securing quality at this level, a sense of confidence is built into the codebase that is absolutely essential for the team to maintain a high pace of innovation without being dragged down by expensive regressions.

Recommendation & Next Steps

Once quality is secured through robust testing, the next logical step is to modernize the team's syntax in the 'Modern Java Fast-Track' workshop. →

Format Workshop

Duration 1 day

Level Professional

Instructor Andreas Olsson

Price per group $2,900

Standard price per group (up to 12 participants) for remote delivery. Additional costs apply for onsite delivery.

Get Quote & Book

Download Overview (PDF)

Tech Stack

JUnit 5 TDD Unit Testing Java 25 Java 21 Clean Code Quality

Your Instructor

Andreas Olsson

Expertise through Active Learning

Java and the Spring Framework have been my core focus for over 20 years. Today, my mission is primarily to help organizations step into the future by integrating intelligent agents and AI-driven features into modern Java systems.

Actlea stands for Active Learning – the philosophy that programming is best learned by writing code, not by watching slides. My workshops focus on intensive, hands-on exercises designed to solve real-world problems.

I deliver proven training concepts globally across all timezones. While I specialize in remote delivery, I love to travel for onsite workshops. My modules are ready for immediate impact but can be tailored to your team's specific requirements.

Connect on LinkedIn

Java • Spring Boot • Spring AI

Enterprise teams trained by Actlea

Participant Reviews

What past participants say

Read about the pedagogical approach, the hands-on labs, and the impact on daily work.

"Andreas is a very good teacher who has all the expertise and methodology to teach java to a beginner. The course content is solid, up-to-date and the program structure is easy to follow. Learning by doing is the hallmark of the course. I became a true admirer of the Java expertise of Andreas during our final project where he magically comes and solves our problems."

"It is clear that Andreas has a great passion and a genuine interest in the success of his students. He has really influenced and inspired me! ⭐️⭐️⭐️⭐️⭐️"

"Andreas is an educational and responsive teacher who makes learning Java fun. He has an ability to adapt his explanations to different levels of knowledge, which means that even complicated programming concepts can be understood. He takes the time to answer questions and give feedback and is always as engaged and concerned about creating a positive learning environment."

"My name is Rabia and I participated in the Java Developer course with Andreas starting January 2022 after 20 years in the banking and finance industry. Previously had no experience whatsoever in the IT world, but chose the track with the digitization the world is going through. The course was incredibly broad & intensive and gave a good overview. When the course was over, I was hired by Capgemini as a junior developer. During the course I probably complained many times about how much information it presented, but I have benefited greatly from everything I have been taught. I continue to learn every day but have an understanding that still amazes me when I realize how much I brought with me. Thanks Andreas for everything! The course has given me the opportunity to pursue a new career in a new industry that I love. The change has given me new energy and opened up new doors. I am so grateful!"

"I'm a senior software engineer whose main languages are TypeScript and Python. I recently joined a new team that's very Java-heavy, and I spent a long time trying to find something that was the right skill level for me to learn Java. Everything I found seemed too basic and was explaining things like the concepts of variables, or assumed too much knowledge and was too difficult. I'm so pleased to have found Actlea; it was precisely what I needed to get up to speed. Andreas was great and found an excellent balance of explaining the language-specific features while assuming some prior knowledge. If you're already familiar with one or more languages and need to get up to speed quickly in Java, this is the course you're looking for. The cadence and pacing of the class is perfect, engaging, and thorough, and I have the tools I need now to delve deeper into this language and make an impact on my team. Thanks, Andreas, for putting this together!"

"I recently had the pleasure of being a student of Andreas and I cannot speak highly enough of his skill and professionalism. Throughout the training, Andreas demonstrated a deep understanding of Java programming and was able to convey complex concepts in a way that was easy to understand. His ability to break down difficult topics and explain them in a clear and concise manner was truly remarkable. Overall, I would highly recommend Andreas as a teacher of Java programming. His skill and professionalism make him an exceptional educator, and I am grateful to have had the opportunity to learn from him. If you are looking for a teacher who is knowledgeable, patient and passionate about teaching, Andreas is the perfect choice."

"Andreas is an excellent teacher who shows great competence in system development with Java and has developed an effective and engaging curriculum. He is an experienced system developer with broad knowledge of the Java ecosystem and he provides valuable feedback that helps students grow and develop as programmers. Andreas also encourages independent and creative thinking for students. I highly recommend Andreas to anyone looking for a high-quality education in Java development."

"During the 12-week intensive training in Java at Academy, Andreas trained me primarily in Spring Boot and the connection between databases and web applications via JDBC and JPA. Andreas showed advanced competence in the field, patience and good teaching ability."

"The Java program at Academic Work was excellent! It consisted of, given the name, mostly programming in Java, but also had some front-end courses. I thought the Java courses were the best. Not only because I was most interested in java, but also because the teacher in the java courses was Andreas. It's easy for it to get messy and "too much" when learning programming, especially for those starting from scratch, but Andreas taught in a very pedagogical way, and it never became long-winded or boring. Recommends the java program at Academic Work to anyone who wants to learn programming and wants to change careers."

"Andreas is the name of competence, skill and reliability. He is no doubt a guru in the field of Java. His style of teaching is practical, well structured and effortless; I learned Java by doing it because of his well organized assignments.I felt connected, confident and comfortable with Andreas during the whole course because he listens, replies and helps each and every student in a very productive and professional way"

Related Training

spring boot Professional

Spring Boot: Spring MVC & Thymeleaf

1 day

Group Rate: $2,900

Rapid Web Development: Build fast SSR web apps with Spring MVC and Thymeleaf. Master forms and sessions through hands-on Active Learning.

Spring MVC & SSR Architecture
Thymeleaf Syntax & Attributes
Form Binding & Submissions

java Foundational

Java Foundations: Comprehensive

5 days

Group Rate: On Request

The complete Java onboarding. Master syntax, OOP, TDD, and functional Streams through five days of intensive Active Learning.

Modern Java 21 & 25 Syntax
OOP, Inheritance & Interface Design
TDD & Unit Testing with JUnit 5

spring boot Professional

Mastering Spring Data & Persistence