spring boot

RESTful APIs with Spring Boot

Build and consume REST APIs with Spring Boot 3. Master @RestController, Spring Data JPA, and the modern RestClient through hands-on coding.

Expected Outcome

The ability to build complete REST APIs with Spring Data JPA and consume external services using RestClient in a professional manner.

Target Audience

Developers wanting to practically implement and integrate REST services with databases and external APIs in 2026.

Prerequisites

Basic knowledge of Spring Boot equivalent to 'Spring Boot Jumpstart: Essentials' is required to dive deep into API development.

Curriculum & Highlights

→ Spring @RestController & MVC

→ Spring Data JPA Persistence

→ Consuming APIs with RestClient

→ Data Mapping & DTO Patterns

→ JSON Processing with Jackson

→ Path Variables & RequestParams

→ HTTP Methods & Status Codes

→ Jakarta EE & Spring Standards

Challenges we address

"How do I implement @RestController and Spring Data JPA to create efficient and searchable CRUD APIs?"

"How do I use the new RestClient to consume external APIs in a secure and type-safe way?"

"How do I map data between database models and API contracts to avoid tight coupling?"

Detailed Description

REST APIs form the backbone of modern system communication, but without a clear structure for how resources are exposed and consumed, services quickly become difficult to maintain. Simply sending JSON isn't enough; building sustainable integrations requires an understanding of how to leverage the framework's built-in support for HTTP standards and effective data persistence. In this workshop, we focus on practical craftsmanship through Active Learning, building and integrating services in real-time. We cover how to create robust endpoints, connect them to databases, and efficiently fetch data from other systems. This training provides the team with the immediate ability to design and implement modern API solutions that follow industry standards and are ready for production in 2026. We implement controllers using @RestController and use Spring Data JPA to handle CRUD operations against a database with a focus on clean syntax and efficient mapping. We explore how to manage data across different layers using DTO patterns and how the modern RestClient in Spring 6 is used to consume external services with a focus on type safety and smooth integration. By focusing on the correct use of Path Variables and Request Parameters, we ensure our APIs adhere to professional Jakarta EE conventions for high-quality backend services. Actlea's core philosophy is that API design is a craft where respect for standards and consistent handling are vital for system longevity. Experience shows that when a team masters both the production and consumption of services in a unified way, integration friction decreases dramatically. This workshop is the critical piece for transforming basic Spring knowledge into an immediate ability to build interconnected and business-driven systems.

Recommendation & Next Steps

With the basics of API development in place, the next natural step is to dive deeper into how to handle persistence and optimize data access in 'Mastering Spring Data & Persistence'. →

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

REST API Spring Boot 3 Spring Data RestClient JSON Architecture

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.

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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 fantastic teacher! In addition to the fact that I experienced him as competent with a solid knowledge of his subjects, he really excels as an educator. Regardless of who you are or what level of knowledge you are at, Andreas always responds to one's questions with commitment, curiosity and a positive attitude that is contagious. Above all, I appreciated that he both gave me space to explore solutions myself and think creatively, while he was always there to contribute his support. I highly recommend Andreas!"

"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 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"

"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."

"Andreas training days were the highlight of the entire training. He is an incredibly competent and pedagogical teacher with great patience. The arrangement of theory and practical work was well structured and balanced, which made one's own learning and development areas clear. He is responsive and supportive, takes time to answer questions and explain it all with a positive attitude!"

"Incredibly educational days with Andreas as a Java teacher. He has extensive knowledge of everything from the older Java versions to the newer ones. Andreas is very good at explaining programming languages in detail and in a way that is easy to understand most of the time! The lessons how challenging and fun that really made one think and train one's problem solving skills. In addition, Andreas has good pedagogy and is very responsive and helpful when you need help. Can strongly recommend Andreas as a teacher of Java and programming in general!"

"Andreas is an incredibly competent person with a lot of positive energy. I wish we had more weeks together because I learned an incredible amount from him and really appreciated his way of teaching."

"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!"

"A fantastic trainer who managed to keep a good and clear structure in an intensive course with a high pace. Andreas is very good at conveying his experience and practical know-how in a way that was engaging and easy to understand. With a structure focused around practical exercises, the training was not only very educational but also incredibly fun."

"Andreas is a very positive and easy-going individual, but above all a fantastic educator. His teaching method and structure is adapted for everyone from beginners to experienced participants. Quick to provide personal assistance, called up on video chat and took his time. I appreciated all the Java days, I am so satisfied and grateful with the foundation I got with me. Strongly recommend. Rating 5 out of 5 stars! ⭐️⭐️⭐️⭐️⭐️"

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