Java Weekly, Issue 591

1. Spring and Java

>> Writing Unit Tests With MockMvcTester: Returning a List as JSON [petrikainulainen.net]

In this second post of his series on MockMvcTester, Petri Kainulainen demonstrates a practical example of testing a Spring MVC REST API endpoint that returns a list as JSON.

>> How ZGC Allocates Memory for the Java Heap [joelsiks.com]

Understanding memory allocation is always worth digging into, so that the JMV is no longer a black box.

Also worth reading:

>> Optimizing the Garbage Collector when Migrating Cloud Workloads [foojay.io]
>> Spring Cloud Data Flow End of Open-Source [spring.io]
>> Guiding an LLM for Robust Java ByteBuffer Code [martinfowler.com]
>> JEP targeted to JDK 25: 503: Remove the 32-bit x86 Port [openjdk.org]
>> Async file IO with Java and io_uring [foojay.io]

Webinars and presentations:

>> A Bootiful Podcast: ‘Mr. Apache’ Jeff Genender [spring.io]
>> Where Is the Java Language Going? [inside.java]
>> From RAG to Enterprise AI Agents: Building Intelligent Java Apps [inside.java]
>> Integrate AI into Your Enterprise in Minutes with Spring AI [spring.io]

Time to upgrade:

>> Spring Framework 7.0.0-M4 Available Now [spring.io]
>> Spring Tools 4.30.0 released [spring.io]
>> Spring for GraphQL 1.3.5 released [spring.io]
>> Spring Security 6.4.5 Released [spring.io]
>> Spring Web Services 4.0.13 available now [spring.io]
>> Spring Data 2025.0.0-RC1 released [spring.io]
>> JDK 24.0.1, 21.0.7, 17.0.15, 11.0.27, and 8u451 Have Been Released [oracle.com]
>> Jakarta EE 11 Web Profile Released, Enabled by Eclipse GlassFish [foojay.io]
>> Quarkus 3.22.0.CR1 [github.com/quarkusio]
>> Helidon 4.2.1 [github.com/helidon-io]
>> Payara Platform Community 6.2025.4 [github.com/payara]

2. Technical & Musings

>> The subtle art of waiting [frankel.ch]

A guide to using wait4x in Kubernetes to configure a service to wait until another service it depends on is ready; this helps avoid multiple pod restarts.

Also worth reading: