Java Coding Notes https://sergueyshinder.dev/ Notes on Java, the JVM and writing software that lasts en Sat, 19 Sep 2026 08:30:00 +0100 lastmod is the cheapest crawl optimisation you are not doing https://sergueyshinder.dev/news/sitemap-lastmod/ https://sergueyshinder.dev/news/sitemap-lastmod/ Sat, 19 Sep 2026 08:30:00 +0100 One tag per URL, and the crawler stops guessing what changed. How I read a JDK release note in ten minutes https://sergueyshinder.dev/news/reading-release-notes/ https://sergueyshinder.dev/news/reading-release-notes/ Fri, 18 Sep 2026 18:40:00 +0100 A filter for release notes that keeps the two sections that matter. I counted the dependencies in a service I inherited https://sergueyshinder.dev/news/dependency-count/ https://sergueyshinder.dev/news/dependency-count/ Thu, 17 Sep 2026 11:30:00 +0100 Nine direct, four hundred and six transitive. A note on what that costs. Java records are not structs, and the difference will bite you https://sergueyshinder.dev/java/records-are-not-structs/ https://sergueyshinder.dev/java/records-are-not-structs/ Wed, 16 Sep 2026 10:20:00 +0100 Value semantics, mutable components, and the equals() trap. The abstraction you added for the second case is usually wrong https://sergueyshinder.dev/ideas/delete-the-abstraction/ https://sergueyshinder.dev/ideas/delete-the-abstraction/ Tue, 15 Sep 2026 16:00:00 +0100 Two examples is not a pattern. It is two examples. Stack traces got shorter and nobody told the logs https://sergueyshinder.dev/news/stack-traces/ https://sergueyshinder.dev/news/stack-traces/ Mon, 14 Sep 2026 08:15:00 +0100 An older note, kept here to show what falls out of the news window. Virtual threads: the pinning problem and how to find it https://sergueyshinder.dev/java/virtual-threads-pinning/ https://sergueyshinder.dev/java/virtual-threads-pinning/ Sat, 12 Sep 2026 09:05:00 +0100 Why your virtual threads are not scaling, and the flag that tells you. Logs are a product, and your user is you at three in the morning https://sergueyshinder.dev/ideas/logs-are-a-product/ https://sergueyshinder.dev/ideas/logs-are-a-product/ Thu, 10 Sep 2026 20:10:00 +0100 Write the line you will need, not the line that is easy to write. Optional is a return type, not a field type https://sergueyshinder.dev/java/optional-is-a-return-type/ https://sergueyshinder.dev/java/optional-is-a-return-type/ Tue, 08 Sep 2026 14:45:00 +0100 Where Optional earns its cost, and the three places it does not.