Spring Boot 3 🔥 | Feature Breakdown | Breaking Changes | New Changes | Part 1

Summary

This video discusses the upgrade from Spring Boot 2 to 3, highlighting challenges, breaking changes, new features, and improvements. It covers the correlation between Java versions and Spring frameworks, the necessity of upgrading to Java 17 and Spring Framework 6, and the impacts on third-party dependencies. The video also demonstrates using GraalVM for faster startup times and outlines changes in property loading, deprecated libraries, and security updates. Additionally, it previews new features like improved micrometer API, Prometheus integration, and enhancements in log4j2 and Elasticsearch support.

Takeaways

• 🚀 Spring Boot 3 was released with significant changes, including the requirement of Java 17 and Spring Framework 6.
• 🔗 The correlation between Java and Spring Framework versions is crucial when upgrading Spring Boot, as seen from the initial Java 1.6 and Spring 4.0 to Java 17 and Spring 6 in Spring Boot 3.
• 📈 Spring Boot 3 focuses on improvements such as faster boot times and ahead-of-time compilation, which are part of its new advancements.
• 🛠️ Upgrading to Spring Boot 3 involves addressing breaking changes, including mandatory upgrades to Java 17 and Spring Framework 6, and dealing with third-party library compatibility.
• 📚 The official release notes for Spring Boot 3 highlight Java 17 as the baseline, the requirement of GraalVM 22.3 for native image support, and updates to Spring Security and Jakarta EE.
• 🔧 Spring Boot 3 introduces new features and deprecations, with the removal of deprecated libraries and changes to auto-configuration and property loading.
• 🔄 The transition from Spring Boot 2 to 3 requires careful consideration of library upgrades, especially for those dependent on Java EE packages that have moved to Jakarta EE.
• 📉 Deprecation of certain features in Spring Boot 3, such as the removal of 'spring.config.use-legacy-processing', may affect applications using specific configurations.
• 🌐 GraalVM support in Spring Boot 3 is a notable feature, enabling the creation of native images for faster startup times and improved performance.
• 📈 Other new features in Spring Boot 3 include upgrades to Micrometer APIs, improvements in Log4j2, and better integration with Prometheus for monitoring.
• 🗓️ The video script also mentions upcoming discussions on support end dates for different Spring Boot versions and the implications for developers.

Q & A

What are the main topics covered in the video script about Spring Boot 3?

The script covers the release of Spring Boot 3, its correlation with Java and Spring Framework versions, the challenges faced during the upgrade from Spring Boot 1 or 2 to 3, and a detailed look at the new features, improvements, breaking changes, and deprecations in Spring Boot 3.

Why was Spring Boot created and what is its initial version?

Spring Boot was created on top of Java and the Spring Framework to simplify the bootstrapping and development of new Spring applications. Its initial version, launched in April 2014, was 1.0.0, using Java 1.6 and Spring Framework 4.0 plus.

What are the major Java and Spring Framework version jumps with Spring Boot 3?

Spring Boot 3 introduced a significant leap in JDK versions, moving to JDK 17, and also upgraded to Spring Framework 6, which includes improvements in boot-up times and ahead-of-time compilations.

What is the significance of the GraalVM in Spring Boot 3?

GraalVM is significant in Spring Boot 3 as it supports ahead-of-time compilation, which greatly reduces application startup time. Spring Boot 3 requires GraalVM version 22.3 or later for native image support.

What are the challenges one might face when upgrading from Spring Boot 2 to 3?

Challenges include the need to upgrade to JDK 17 and Spring Framework 6, potential incompatibilities with third-party libraries that may not support these newer versions, and the need to migrate to Jakarta EE for packages previously using Java EE.

What is the impact of upgrading to Spring Boot 3 on Spring Data JDBC?

There is a breaking change in Spring Data JDBC where the conditional bean auto-configuration has been altered. Users might need to re-inject beans using auto-configuration if they were using conditional bean injections in Spring Boot 2.4.

What is the default behavior when loading properties in Spring Boot 3.0 with multiple profiles?

In Spring Boot 3.0, the default behavior when loading properties with multiple profiles is that whatever gets loaded last will be the highest priority, as it uses a HashMap to store values.

What are some of the new features in Spring Boot 3 that could be beneficial for developers?

New features include improved micrometer API support for easier integration with Prometheus, enhancements in log4j2 for better profile and environment property management, and automatic population of trace IDs in Prometheus for micrometer tracing.

What does the script suggest for identifying deprecated classes or libraries in an existing Spring Boot application?

The script suggests using compiler arguments such as `-Werror` and `-Xlint:deprecation` with the Maven compiler plugin to identify deprecated classes or libraries and break the build if deprecations are used.

What is the importance of the support end dates mentioned in the script for Spring Boot versions?

The support end dates are important as they indicate the period during which a particular version of Spring Boot will receive updates and support. Understanding these dates can help in planning upgrades to newer versions.

How does Spring Boot 3 handle the integration of Spring Security?

Spring Boot 3 has upgraded Spring Security, leading to several changes in how it integrates with the Spring Security library. Developers using Spring Security extensively should look out for specific changes and updates in the upcoming videos mentioned in the script.