JVM Internals
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Software Development
The Bytecode Verifier’s Hidden Contract
Every class file passes a formal dataflow analysis before the JIT ever sees it, and that quiet checkpoint is what…
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Core Java
Compact Object Headers in Production: The Free 15–25% Heap Reduction Nobody Enabled
JEP 519 shipped stable in JDK 25. It shrinks every single object header on the heap. It’s one JVM flag.…
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Core Java
Tail Call Optimization: Why the JVM Doesn’t Do It
A bytecode-level look at why recursive calls can’t quietly collapse their stack frames on the JVM, and why Scheme and…
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Core Java
Understanding the Java Memory Model: Visibility, Ordering, and the Guarantees Most Developers Miss
Why the JMM is the invisible contract behind every concurrent Java program — and what breaks when you misread it.…
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Enterprise Java
How Spring Proxies Actually Work — And the Four Cases Where They Silently Don’t
A deep-dive into how @Transactional, @Cacheable, and @Async use CGLIB or JDK dynamic proxies — and the four well-known failure…
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Core Java
Value Classes (JEP 401): When Records Aren’t Flat Enough for the JIT
How value classes differ from records — no identity, no heap header — where they outperform records in tight loops,…
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Core Java
How the JVM Decides What to Compile: Inside the JIT Tier System and Profiling Pipeline
A conceptual walkthrough of C1, C2, tiered compilation, and why the JVM’s optimizer knows more about your code than you…
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Core Java
Understanding Garbage Collection Pauses: Why Stop-the-World Still Happens and What the JVM Is Actually Doing
A conceptual guide to safepoints, GC roots, and why even modern collectors like ZGC and Shenandoah cannot always avoid pausing…
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Core Java
The Java Memory Model Explained: Happens-Before and Concurrency Semantics
There is a quiet assumption embedded in almost every line of Java ever written: that when one thread writes a…
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