Understanding the Key Derivation Function API in Java 25

Java 25 introduces a standardized Key Derivation Function (KDF) API that simplifies the process of deriving cryptographic keys from passwords,…

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Java 26 Primitive Types in Patterns — The Interview Trap

Java 26 ships JEP 530 — the fourth preview of primitive types in patterns — and with it comes one of the…

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Implementing Quantum-Resistant ML-KEM and ML-DSA in Java

As quantum computing continues to evolve, traditional public-key cryptographic algorithms such as RSA, DSA, and Elliptic Curve Cryptography (ECC) face…

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Spring AI 2.0 + MCP: Building a Tool-Calling Agent in 50 Lines

Spring AI 2.0-M6, shipped May 8, 2026, is the milestone where building an MCP tool-calling agent in Java stops feeling…

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Virtual Thread Pinning: The Silent Performance Killer in Your Codebase

Virtual threads promise to make blocking I/O cheap. And they do — as long as they can actually unmount from…

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Records in Production: Where They Shine and Where They Silently Fail

Records are one of the most genuinely useful additions to modern Java. They eliminate boilerplate, communicate immutability at the type-system…

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Why Your Integration Tests Are Slower Than They Should Be: The Spring Context Cache You Don’t Know You’re Misusing

Every JCG article recommends @SpringBootTest for integration testing. Almost none explain the context cache model underneath it — how a single misplaced @DirtiesContext,…

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Idempotency Keys Are Harder Than They Look: The 5 Failure Modes Nobody Talks About

Every payment guide, every microservices tutorial, and every distributed-systems primer tells you the same thing: make your endpoints idempotent. Add…

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Extracting HTTP Basic Authentication from HttpServletRequest

Authentication is a fundamental aspect of securing web applications. One of the simplest and most widely used authentication mechanisms is…

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