What the JIT Actually Does to Your Hot Loop
Tiered compilation, on-stack replacement and inlining decide how your loop really runs. Here is how to read those decisions instead of guessing.
Marcus Venn
JVM Scope
Java, runtimes, frameworks, and the systems beneath them: deep technical writing about the JVM and its ecosystem.
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Where Spring Boot Startup Time Goes
Startup time is class loading, condition evaluation and JIT warmup in some proportion. Measure the split before reaching for a fix.
Reading a Thread Dump Without Guessing
A thread dump answers precise questions if you ask them precisely. What each state really means, and the traps that produce confident wrong diagnoses.
G1 versus ZGC: What the Pause Numbers Hide
Sub-millisecond pauses are real, and they are not the whole cost. What the two collectors actually trade, and which numbers to compare instead.
Escape Analysis and the Allocation That Never Happened
C2 can delete an object entirely by proving it never escapes. Here is when that works, when it silently stops, and how to measure the difference.
Virtual Threads and the Pinning Problem
Virtual threads scale until something nails one to its carrier. Here is what still pins on modern JDKs, and how to see it happen.