https://tsvinc.dev/tags/jdk25/ Recent content in Jdk25 on tsvinc Hugo en-us Sun, 25 Oct 2026 00:00:00 +0000 https://tsvinc.dev/posts/java25-opentelemetry-upgrade/ Sun, 25 Oct 2026 00:00:00 +0000 https://tsvinc.dev/posts/java25-opentelemetry-upgrade/ <p>A JDK upgrade gets tested like a runtime change. Does it compile, does it start, did the GC pauses get worse. Telemetry rides along as if it were part of the runtime. In practice it's a contract written in strings, like <code>jvm.gc.name=&quot;ZGC Pauses&quot;</code> and <code>jvm.memory.pool.name=&quot;ZHeap&quot;</code>, and no test suite asserts on a name the JVM makes up at start-up. When those strings change, nothing errors. A panel goes flat, an alert stops firing, and both look exactly like a healthy service.</p>