Java
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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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How to Read a Flame Graph: A Practical Profiling Guide for JVM Developers
Stop guessing where your Java app is spending its time. Here is everything you need to go from zero to…
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