Java
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Enterprise Java
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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Software Development
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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Core Java
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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Core Java
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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Core Java
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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Core Java
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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Core Java
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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Enterprise Java
The Database Migration Risk That Hibernate Silently Creates
Why hbm2ddl.auto=update is still in production codebases — and what to do about it Somewhere in a production codebase right now, Hibernate…
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Core Java
How to Import P7B into Java Keystore
In Java-based applications, SSL/TLS certificates are managed using a Java KeyStore (JKS or PKCS12). Often, certificates are provided in different…
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