Baeldung

Java, Spring and Web Development tutorials

Java Weekly, Issue 626
2025-12-27 15:08 UTC by baeldung

1. Spring and Java

>> Next-level Kotlin support in Spring Boot 4 [spring.io]

We’re finally getting idiomatic null-safety across the portfolio with the JSpecify baseline, eliminating platform types for good. Spring Boot 4 also ads a number of other improvements. Solid stuff if you’re using Kotlin.

>> Thread Dumps and Project Loom (Virtual Threads) [jetbrains.com]

We’re now able to navigate millions of virtual threads without noise, thanks to IntelliJ’s new grouped thread dumps. It’s definitely easier to debug deadlocks and performance issues in a Loom-based service.

Also worth reading:

• >> Evolving Spring Vault: Introducing VaultClient [spring.io]
• >> Explainable AI Agents: Capture LLM Tool Call Reasoning with Spring AI [spring.io]
• >> JEP 500: Java to Enforce Strict Final Field Immutability by Restricting Reflection [infoq.com]
• >> The Ultimate Guide to Successfully Adopting Kotlin in a Java-Dominated Environment [jetbrains.com]
• >> Quarkus Hibernate with Panache Next [quarkus.io]
• >> The Real Mechanics of Vulnerabilities in an Upstream/Downstream, Topsy-Turvy EOL World [foojay.io]
• >> TornadoVM 2.0 Brings Automatic GPU Acceleration and LLM Support to Java [infoq.com]

Webinars and presentations:

• >> A Bootiful Podcast: Spring cofounder Juergen Hoeller on the amazing Spring Framework 7 release [spring.io]
• >> Episode 43 “Predictability or Innovation? Both!” with Georges Saab [inside.java]
• >> Java’s 2025 in Review – Inside Java Newscast #103 [inside.java]
• >> Virtual Threads in the Real World: Fast, Robust Java Microservices with Helidon [inside.java]
• >> A Bootiful Podcast: Nate Schutta the fundamentals of software engineering [spring.io]
• >> Foojay Podcast #87: The Human Side of Development [foojay.io]
• >> The Latest in OpenJDK and JCP Expert Group: Insights with Simon Ritter [infoq.com]

Time to upgrade:

• >> Spring Boot 4.0.1, 3.5.9 and 3.4.13 [spring.io]
• >> Spring Cloud 2025.0.1 [spring.io]
• >> Spring Modulith 2.0.1, 1.4.6 and 1.3.12 [spring.io]
• >> Spring Tools 5.0.1 [spring.io]
• >> Spring Batch 6.0.1 [spring.io]
• >> Quarkus 3.30.5 and 3.30.4 [quarkus.io]
• >> Micronaut Platform 4.10.6 [github.com]
• >> WildFly 39 Beta 1 [wildfly.org]
• >> Hibernate Search 8.2.1.Final and 7.2.5.Final [in.relation.to]
• >> Hibernate Reactive 4.2.1.Final and 3.2.1.Final [in.relation.to]
• >> Elasticsearch 9.2.3 and 8.19.9 [elastic.co]
• >> IntelliJ IDEA 2025.3.1 [jetbrains.com]
• >> Apache Maven 3.9.12 [maven.apache.org]

2. Technical & Musings

Also worth reading:

• >> My AI Colleague: Claude, the good, the bad, the UglAI [scottlogic.com]
• >> What Actually Is Claude Code’s Plan Mode? [lucumr.pocoo.org]
• >> Code Actions – implementing a custom MCP server [krasserm.github.io]

3. Pick of the Week

>> Do Things that Don’t Scale [paulgraham.com]

       

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