Core Java
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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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Java Sock Merchant Problem: Solutions with Arrays and HashSets
The Sock Merchant problem is an algorithm challenge that tests our ability to work with arrays, counting, and basic data…
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Convert ByteBuffer to Byte Array in Java
Java applications often work with binary data while performing file operations, network communication, serialization, and NIO (New I/O) programming. Two…
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Event Sourcing Without a Framework: What You Actually Need, What You Don’t, and the Parts Nobody Warns You About
Most Java tutorials reach for Axon before explaining the moving parts underneath it. This is the framework-agnostic treatment — the…
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