--- title: "#jvm articles | Hashnode" description: "Explore 191 articles tagged #jvm on Hashnode. Tutorials, guides, and how-tos from the community." url: "https://hashnode.com/tag/jvm" --- Tag # #jvm 191 posts · 18 followers [Andrii Zhukovskyi](https://hashnode.com/@zhukovskyi) · [1d ago](https://hashnode.com/posts/why-a-java-pod-gets-oomkilled-in-kubernetes-with-a-half-empty-heap/6af3351518573de2479b867a) ### [Why a Java pod gets OOMKilled in Kubernetes with a half-empty heap](https://zhukovskyi.hashnode.dev/why-a-java-pod-gets-oomkilled-in-kubernetes-with-a-half-empty-heap?utm_source=hashnode&utm_medium=feed) In short. A container memory limit covers everything the JVM uses, and the heap is only part of it. Metaspace, thread stacks, the code cache and direct buffers live outside the heap, so a pod with -Xm 6 min read · [zhukovskyi.hashnode.dev](https://zhukovskyi.hashnode.dev/why-a-java-pod-gets-oomkilled-in-kubernetes-with-a-half-empty-heap?utm_source=hashnode&utm_medium=feed) [BaoKhang](https://hashnode.com/@baokhang) · [3d ago](https://hashnode.com/posts/shrink-jvm-memory-kubernetes-in-place-resize/6af050df117a53bdeb34d26f) ### [Your JVMs Are Burning Money Overnight — Here's How to Shrink Them Safely in Kubernetes](https://baokhang.hashnode.dev/shrink-jvm-memory-kubernetes-in-place-resize?utm_source=hashnode&utm_medium=feed) Java pods pay for peak memory all night. See how to shrink the JVM first, verify it, then resize the pod in place, with no restarts. 16 min read · [baokhang.hashnode.dev](https://baokhang.hashnode.dev/shrink-jvm-memory-kubernetes-in-place-resize?utm_source=hashnode&utm_medium=feed) [BaoKhang](https://hashnode.com/@baokhang) · [3d ago](https://hashnode.com/posts/why-kubernetes-1-35-resizepolicy-restartcontainer-isn-t-required-for-zgc-shenandoah/6af0b3cf429365be92029039) ### [Why Kubernetes 1.35 resizePolicy: RestartContainer Isn't Required for ZGC/Shenandoah](https://baokhang.hashnode.dev/why-kubernetes-1-35-resizepolicy-restartcontainer-isn-t-required-for-zgc-shenandoah?utm_source=hashnode&utm_medium=feed) A lot of current advice says to set resizePolicy: RestartContainer for memory on every JVM container. For growing the heap ceiling, that advice is right. For shrinking and regrowing within a ceiling y 10 min read · [baokhang.hashnode.dev](https://baokhang.hashnode.dev/why-kubernetes-1-35-resizepolicy-restartcontainer-isn-t-required-for-zgc-shenandoah?utm_source=hashnode&utm_medium=feed) [BaoKhang](https://hashnode.com/@baokhang) · [3d ago](https://hashnode.com/posts/your-g1-pod-ignores-softmaxheapsize-here-s-what-works-instead/6af0c11f73b354e32d8cd296) ### [Your G1 Pod Ignores SoftMaxHeapSize. Here's What Works Instead](https://baokhang.hashnode.dev/your-g1-pod-ignores-softmaxheapsize-here-s-what-works-instead?utm_source=hashnode&utm_medium=feed) Tested G1, ZGC and Shenandoah in a Linux container: which flag returns memory, and which one only says it did. 11 min read · [baokhang.hashnode.dev](https://baokhang.hashnode.dev/your-g1-pod-ignores-softmaxheapsize-here-s-what-works-instead?utm_source=hashnode&utm_medium=feed) [BaoKhang](https://hashnode.com/@baokhang) · [3d ago](https://hashnode.com/posts/kubernetes-pod-resize-stuck-in-progress-jvm/6af0c696398465e528bff9ff) ### [Why Kubernetes In-Place Memory Resize Gets Stuck "In Progress" on JVM Pods](https://baokhang.hashnode.dev/kubernetes-pod-resize-stuck-in-progress-jvm?utm_source=hashnode&utm_medium=feed) Pod resize stuck on PodResizeInProgress with "below current usage"? A JVM keeps its heap. See real kubectl output and how to unblock it. 10 min read · [baokhang.hashnode.dev](https://baokhang.hashnode.dev/kubernetes-pod-resize-stuck-in-progress-jvm?utm_source=hashnode&utm_medium=feed) [Gowtham Muthuvel](https://hashnode.com/@GowthamMuthuvel) · [Oct 27](https://hashnode.com/posts/virtual-thread-pinning-java-25/6ae06ecd08b41add23f0fd2d) ### [Virtual Thread Pinning in Java 25: What Still Pins After JEP 491](https://gowthammuthuvel.hashnode.dev/virtual-thread-pinning-java-25?utm_source=hashnode&utm_medium=feed) Java 24+ fixed synchronized pinning, but class initializers still pin virtual threads. A JDK 21 vs 25 test, JFR detection, and the fix. 9 min read · [gowthammuthuvel.hashnode.dev](https://gowthammuthuvel.hashnode.dev/virtual-thread-pinning-java-25?utm_source=hashnode&utm_medium=feed) [Fekri](https://hashnode.com/@fekdaoui) · [Oct 27](https://hashnode.com/posts/spotting-new-ios-apps-in-kotlin-polling-search-results-for-fresh-release-dates-and-the-walls-you-ll-hit-2026/6ae05e9b7651a675141b3c13) ### [Spotting New iOS Apps in Kotlin: Polling Search Results for Fresh Release Dates, and the Walls You'll Hit (2026)](https://fekdaoui.hashnode.dev/spotting-new-ios-apps-in-kotlin-polling-search-results-for-fresh-release-dates-and-the-walls-you-ll-hit-2026?utm_source=hashnode&utm_medium=feed) A dependency-free Kotlin/JVM script that flags recently launched apps in your App Store searches and remembers them between runs 12 min read · [fekdaoui.hashnode.dev](https://fekdaoui.hashnode.dev/spotting-new-ios-apps-in-kotlin-polling-search-results-for-fresh-release-dates-and-the-walls-you-ll-hit-2026?utm_source=hashnode&utm_medium=feed) [Felipe Maschio](https://hashnode.com/@maschiojv) · [Oct 19](https://hashnode.com/posts/what-jstack-misses-when-your-java-service-uses-virtual-threads/6ad632b65bfe8c4ac01f8391) ### [What jstack Misses When Your Java Service Uses Virtual Threads](https://maschiojv.hashnode.dev/what-jstack-misses-when-your-java-service-uses-virtual-threads?utm_source=hashnode&utm_medium=feed) Take a Spring Boot service with virtual threads enabled, a HikariCP pool of 10 connections, and roughly 5,000 requests in flight. Latency is climbing. You grab a thread dump and find 43 platform threa 8 min read · [maschiojv.hashnode.dev](https://maschiojv.hashnode.dev/what-jstack-misses-when-your-java-service-uses-virtual-threads?utm_source=hashnode&utm_medium=feed) [Daisuke Masuda](https://hashnode.com/@x5gtrn) · [Oct 18](https://hashnode.com/posts/article-2026-19-18-1954/6ad4a5d6d556cf56ee31d7ac) ### [Java 8/11 to Java 21, 25, or 27: A Practical Migration Guide](https://daisuke.masuda.tokyo/article-2026-19-18-1954?utm_source=hashnode&utm_medium=feed) Compatibility, performance, and a rollout you can reverse 21 min read · [daisuke.masuda.tokyo](https://daisuke.masuda.tokyo/article-2026-19-18-1954?utm_source=hashnode&utm_medium=feed) [1](https://hashnode.com/posts/article-2026-19-18-1954/6ad4a5d6d556cf56ee31d7ac) [Mihai\_LeanZero](https://hashnode.com/@mihaileanzero) · [Oct 3](https://hashnode.com/posts/jira-data-center-heap-size-and-jvm-tuning-for-a-cloud-migration-setenvsh-and-jcma/6ac13b7f5224e16af4390734) ### [Jira Data Center heap size and JVM tuning for a Cloud migration: setenv.sh and JCMA](https://leanzero.hashnode.dev/jira-data-center-heap-size-and-jvm-tuning-for-a-cloud-migration-setenvsh-and-jcma?utm_source=hashnode&utm_medium=feed) Jira Data Center heap size and JVM tuning before a Cloud migration: a heap calculator from Atlassian tables and GC logs, the 32-47 GB rule, JCMA, DB pool. 49 min read · [leanzero.hashnode.dev](https://leanzero.hashnode.dev/jira-data-center-heap-size-and-jvm-tuning-for-a-cloud-migration-setenvsh-and-jcma?utm_source=hashnode&utm_medium=feed)