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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The Split-Brain Problem in Plain English — And the Three Ways Your Distributed Cache Handles It Wrong

Redis Sentinel, Hazelcast, and Infinispan all have split-brain documentation. None of them tell you what your Java code silently observes…

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ThreadLocal Is a Memory Leak Waiting to Happen With Virtual Threads — Here’s the Proof

ThreadLocal was designed for a world of 200 pooled platform threads living for the life of an application. Virtual threads…

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JDBC Connector/J & MySQL Communications Link Failure Fix

The Communications link failure error is one of the most common connection-related issues encountered when Java applications interact with MySQL…

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The Hidden Cost of Records: When Java’s Immutable Data Classes Quietly Hurt Your GC

Records are clean, expressive, and widely adopted — but in tight, allocation-heavy loops, they can pile invisible pressure on the…

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Querying Records Between Two Dates Using Hibernate

Querying records between two dates is a common requirement in enterprise applications. Examples include retrieving orders placed within a specific…

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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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