Refactoring Java to Kotlin with Spring Boot

Transition from Java to Kotlin by refactoring a library management application using modern Spring Boot conventions and clean coding practices.

5.0 (158) ⏱ 1h 37m 📚 3 lessons 🎧 Audio version

About this course

Transitioning from Java to Kotlin can feel challenging when you are used to traditional object-oriented patterns. This text-based course guides you through the process of refactoring an existing Java application into clean, idiomatic Kotlin code. By working through a library management project, you will understand how to leverage Kotlin's powerful features within the Spring Boot ecosystem. You will transform verbose Java code into concise, safe, and maintainable Kotlin, preparing you for modern backend development. What you'll learn: - Understand the fundamental syntax differences and interoperability rules between Java and Kotlin. - Refactor a legacy Java Spring Boot application into idiomatic Kotlin step-by-step. - Apply Kotlin's null safety, data classes, and advanced type system to eliminate boilerplate code. - Configure Spring Boot database migrations and modern data access patterns using Spring Data. - Integrate modern asynchronous patterns using Kotlin coroutines for efficient backend operations. - Write clean, idiomatic unit tests in Kotlin to ensure your refactored application remains fully functional. The course starts with essential Kotlin concepts and Java interoperability basics before diving into the practical refactoring process. You will systematically analyze Java components, rewrite them in Kotlin, and implement modern backend best practices through guided written explanations and code examples. This course is designed for Java developers looking to adopt Kotlin, as well as beginners with basic programming knowledge who want to learn modern Spring Boot development. No prior Kotlin experience is required. Start reading today to elevate your backend development skills and master the transition to Kotlin.

What you'll get

  • 📜 Certificate of completion
    Add it to your LinkedIn profile
  • 🎧 Audio version included
    Learn on the go — no screen needed
  • ♾️ Lifetime access
    Come back anytime, no expiry
  • 📱 Phone or computer
    Works anywhere, any device
  • 💸 30-day refund
    No questions asked
  • Short & focused
    1h 37m of practical content

Reviews (3)

Kabir Mehra SG
★ 3 · 2026-01-03T19:22:23+00:00

Pretty good. The practical aspects were well-covered. Might be a bit fast for complete beginners in some sections, but manageable.

Elżbieta Szymańska PL Verified learner
★ 3 · 2025-09-14T14:35:23+00:00

It's a decent introduction. Could benefit from more diverse examples and a slightly better flow between modules.

Layla Sanders AU
★ 4 · 2025-05-28T11:10:23+00:00

Pretty good foundation. The examples were mostly helpful. Might need additional practice elsewhere for mastery.

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Just a phone or computer with internet. No installs, no special hardware.

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Yes — full refund within 30 days, no questions asked.

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Forever. Once you purchase, the course is yours to revisit anytime.

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