The latest Spring AI 2.0 and Spring Cloud 2025.1 releases make virtual threads the default concurrency model, showing why Java 21 is essential for AI workloads, how Spring Cloud drops Reactive Kafka, adds MVC‑plus‑virtual‑thread support, and what pitfalls developers must avoid.
This guide explains how Spring Boot 3.5.6 running on JDK 21 can leverage Java virtual threads to handle millions of concurrent requests, covering the concept, environment setup, Maven configuration, enabling the feature, and a simple test controller to verify the thread model.
The article recounts a Java developer’s journey from Java 8 to Java 21, highlighting how new language features like var, text blocks, switch expressions, records, pattern matching, and virtual threads dramatically improve readability, reduce boilerplate, and boost concurrency performance.
This article reviews Oracle's Java 21 LTS release, outlines its new JEP features, compares it with Java 17, shares upgrade experiences including pom updates and runtime fixes, and evaluates generational ZGC and virtual threads with performance tests and code examples.
Java 21 introduces critical bug fixes, correcting the precision of Double.toString() and Float.toString() outputs and fixing the erroneous value comparison in IdentityHashMap’s remove(key, value) and replace(key, value, newValue) methods, ensuring expected behavior across versions.
This article reviews the Java 21 LTS release, lists its new JEPs, shares an upgrade experience from Java 17, evaluates the generational ZGC and virtual‑thread improvements, demonstrates record‑pattern syntax, and provides code samples and performance observations.
This article outlines Java 21’s release as the next LTS, highlights its new standard, preview, and incubating features—including virtual threads, record patterns, and the Vector API—and provides a concise timeline of major enhancements from Java 8 through Java 20.
