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Introduction to Spring Boot 4

The Evolution of Spring Boot: Transitioning to Version 4

Java 21 Baseline and Language Enhancements

Core Framework and Infrastructure

Virtual Threads and Project Loom Integration

Jakarta EE 11 Support and Dependency Management

Cloud Native and Performance

Enhanced AOT and GraalVM Native Image Support

Observability and OpenTelemetry Integration

Knowledge Assessments

Quiz: Java Baseline and Versioning

Quiz: Virtual Threads and Concurrency

Quiz: Jakarta EE 11 and Dependencies

Quiz: AOT and Native Images

Quiz: Observability and Monitoring

Course Completion

Spring Boot 4 Course Feedback

Level up your Spring skills with Spring Boot 4: New Features and Hands-on Code Examples. This practical course walks experienced Java developers through the most important upgrades in Spring Boot 4—including the Java 21 baseline, Virtual Threads via Project Loom, Jakarta EE 11 alignment, enhanced AOT processing, GraalVM native images, and first-class OpenTelemetry integration. You’ll learn what changed, why it matters, and exactly how to apply it in real-world services. We’ll start by mapping the evolution from Spring Boot 3.x to 4, highlighting breaking changes, LTS considerations, and a safe migration path. Then we’ll leverage modern Java language features—records, sealed classes, and pattern matching—to reduce boilerplate in controllers, services, and domain models. Next, you’ll master Virtual Threads to build high-throughput, blocking I/O applications without adopting a reactive stack, followed by dependency updates for Jakarta EE 11, covering Servlet, JPA, and Validation changes. For cloud-native performance, we’ll guide you through AOT optimizations and GraalVM native compilation for blazing-fast startup and lower memory footprints—ideal for containers and serverless. Finally, you’ll instrument services with Micrometer and OpenTelemetry for robust metrics, traces, and end-to-end observability. Each module includes focused code examples, migration checklists, and quizzes to validate your knowledge. By the end, you’ll be ready to modernize existing apps or build fresh Spring Boot 4 services with confidence, performance, and observability baked in.

Spring Boot 4: New Features and Hands-on Code Examples

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            <p>The release of Spring Boot 4 marks a significant milestone in the evolution of the Spring ecosystem, necessitating a comprehensive understanding of its updated technology baseline and architectural refinements. As the industry transitions from the Spring Boot 3.x lifecycle, this course provides a rigorous exploration of the shift to Java 21 as the minimum required version. Developers will examine the removal of legacy support and the integration of modern language features, such as record patterns and sealed classes, which are now fundamental to the framework's core components. By assessing upgrade readiness and identifying breaking changes, participants will establish a solid foundation for migrating enterprise applications to this latest major version while leveraging the full power of the modern JDK.</p>

<p>Beyond versioning and baseline updates, this curriculum delves into the transformative impact of Project Loom and Jakarta EE 11 on modern Java development. Attendees will gain practical experience in leveraging virtual threads to achieve high-concurrency throughput, effectively bypassing the complexity of traditional reactive programming models. The course further addresses the demands of cloud-native environments through enhanced Ahead-of-Time (AOT) processing and GraalVM native image support, ensuring optimized startup times and reduced memory footprints for serverless deployments. Through detailed code examples and a focus on observability via OpenTelemetry integration, Java developers will acquire the technical proficiency required to build, monitor, and scale resilient, high-performance Spring Boot 4 applications.</p>
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