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javacodegeeks.com /1 month ago

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. Most Java developers write concurrent code by reasoning about it a...

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javacodegeeks.com /5 days ago

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 actually makes the JVM’s sandbox model possible. Ask most Java dev...

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javacodegeeks.com /2 weeks ago

The Observer Effect in JVM Profiling

Attach a profiler to see what the JIT is really doing, and you’ve just changed what the JIT does. On the JVM, that’s not a metaphor. It’s a specific, mechanical consequence of how...

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blog.frankel.ch /2 weeks ago

Security Baked Into the JVM: sixteen Subjects on the wire

Alice calls the order service. The order service calls the ledger on her behalf. At the second hop, the ledger has to decide whose authority the debit is being made under. Most s...

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javacodegeeks.com /3 weeks ago

Understanding Ahead-of-Time (AOT) Caching in Java

Java applications have traditionally relied heavily on runtime class loading, linking, interpretation, profiling, and Just-in-Time (JIT) compilation. These mechanisms provide excel...

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javacodegeeks.com /1 month ago

Virtual Thread Pinning: The Synchronized Block Trap Nobody Warned You About

Virtual threads are supposed to make blocking cheap. That is the whole promise of Project Loom: keep the simple thread-per-request style, but let the JVM mount and unmount those li...

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dzone.com /2 weeks ago

A Practical Guide to Using Java Virtual Threads With JMS Listeners

Scaling JMS Listeners With Java Virtual Threads Event-driven architecture is widely used in enterprise systems to decouple services, absorb traffic spikes, and move work out of req...

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infoq.com /1 month ago

Article: Virtual Threads After JDK 24: What Changed for Production Java

JDK 24 removed the monitor-related carrier-thread pinning that stalled Netflix and similar teams on Java 21. What has replaced it on JDK 25 LTS is downstream-resource saturation: T...

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blog.frankel.ch /1 month ago

Security Baked Into the JVM: two Subjects, one call

The constraint system stops a bad call before it leaves the JVM. The Safe Codebase Audit Pipeline stops bad code before a client ever loads it. What remains is identity: who is cal...

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javacodegeeks.com /1 month ago

Escape Analysis and Scalar Replacement: Why Some Objects Never Touch the Heap

Small, verifiable before and after code examples showing what helps, or defeats, the JIT’s ability to keep an object off the heap entirely. HotSpot does not actually allocate objec...

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javacodegeeks.com /1 month ago

Java 26: New Features Overview

Java continues its evolution with another major release. Java 26 introduces important improvements across language features, runtime performance, garbage collection, concurrency, s...

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blog.frankel.ch /1 month ago

Security Baked Into the JVM: the Safe Codebase Audit Pipeline

In Part 1, the minimal deployment showed constraints traveling with the proxy: authentication, encryption, hardened deserialization, all declared in configuration and enforced at t...

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javacodegeeks.com /1 week ago

The CALM Theorem: When Distributed Consistency Doesn’t Need Coordination

The theory behind why some distributed computations are safely coordination-free, and how to spot which ones are. Every distributed systems engineer eventually runs into the same w...

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infoq.com /4 weeks ago

Project Valhalla's First Preview: JEP 401 Redefines == for Java Objects

JEP 401, integrated into JDK 28, introduces value objects. These new class instances feature final fields, altered behavior for equality checks, and stricter construction and synch...

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javacodegeeks.com /1 week ago

Java as MCP Infrastructure: What Happens When Every Enterprise JVM Becomes an Agent Host

Spring AI, LangChain4j, Quarkus, and Helidon all now speak the Model Context Protocol. That is a bigger shift than another integration library, because for the first time it points...

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theregister.com /1 month ago

Java was a three-day hotfix away from dying horribly on stage

Tim Lindholm, Java's original JVM maintainer, shares with El Reg some of the grungy build details the doc glosses over

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