--- title: "On HotSpot Error Files and Useful Tools - Mostly nerdless" url: https://daily.dev/posts/on-hotspot-error-files-and-useful-tools---mostly-nerdless-yicfglo4s source_url: https://mostlynerdless.de/blog/2026/04/16/on-hotspot-error-files-and-useful-tools/ type: article source: "Mostly Nerdless" published: 2026-04-16T07:44:19.336Z updated: 2026-04-16T07:44:46.400Z tags: ["java", "vscode", "webassembly", "jvm"] reading_time: 8 upvotes: 0 comments: 0 language: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # On HotSpot Error Files and Useful Tools - Mostly nerdless **[Mostly Nerdless](https://daily.dev/sources/mostly-nerdless)** · 8 min read · 0 upvotes · 0 comments ## Summary A deep dive into HotSpot error files (hs_err), the crash reports generated when a JVM crashes. Covers the structure of these files including the header/summary, thread section, process section, events, and dynamic libraries subsections. Also introduces two new tools: a VSCode syntax highlighting extension for hs_err files, and a browser-based redaction tool built using GraalVM Web Image (compiled to WebAssembly) that lets you redact sensitive information like usernames, folder paths, and hostnames without a backend server. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [foojay – a place for friends of OpenJDK](https://daily.dev/posts/foojay-a-place-for-friends-of-openjdk-lwyzoctef) · Foojay.io · 0 upvotes · 0 comments - [VM Options Explorer - OpenJDK11 HotSpot](https://daily.dev/posts/vm-options-explorer---openjdk11-hotspot-r1iqsnitu) · Hacker News · 0 upvotes · 0 comments --- Tags: [#java](https://daily.dev/tags/java), [#vscode](https://daily.dev/tags/vscode), [#webassembly](https://daily.dev/tags/webassembly), [#jvm](https://daily.dev/tags/jvm) [View this post on daily.dev](https://daily.dev/posts/on-hotspot-error-files-and-useful-tools---mostly-nerdless-yicfglo4s)