Localise every hotlinked image, and re-encode to stay under the artifact limit

[FDelporte]

393 posts referenced 1710 images on 115 hosts we do not control, and 129 of them across 46 posts were already dead -- a broken glyph mid-article on the live site. Hotlinking also spends a stranger's bandwidth on every page view, leaks each reader's IP to whoever owns the host, and puts 455 MB of pictures outside anything this repo can measure or shrink.

External references are now 212, and those are the unrecoverable remainder rather than a backlog: 44 dead, 9 behind a bot wall (a 403 is about the client, so they are kept), 4 mermaid.ink 503s, 3 connection failures, 5 live CI badges.

Two halves, agreeing on the filename by construction:

• shared/HtmlToMarkdown.localizeImages localises ANY host, so a re-scrape produces local files and no post needs freezing. An external image is stored as -<8 hex of its URL>.: 58 bundles reference a URL whose basename is already a file in that bundle, where Files.exists would short-circuit and silently display a picture from another source. Lookup is by stem, ignoring the extension, which covers the 221 URLs that carry no extension at all and finds a file images.py later re-encoded. Content-Type is checked, because a dead URL usually answers 200 with HTML. WordPress emoji s are restored to the character; a GitHub Actions badge.svg stays hotlinked.

• cleanup/external_images.py is the one-off sweep, shrinking in a temp dir so an oversized original never enters the repo -- and therefore never enters git history, which nothing here rewrites.

The import cost all the headroom (0.99 GB against a 1 GB limit whose warning lands on a green run). Bought back by de-duplicating 48 images stored twice (13.2 MB), lowering images.py --png-min from 300 KB to 100 KB site-wide (983 of 1263 PNGs converted, checked against before/after crops at reading size), and giving two newly-local animated heroes a still poster. Build: 864 MB, 136 MB of headroom.

Also fixes a latent bug in images.py: rewrite_in_bundle did a plain str.replace, so converting dummies.png rewrote the suffix of image-764x1024-dummies.png and pointed its hero at a file nothing ever wrote (add-mnemonic-bookmark.png too). It matches whole filenames now. BuiltSite.java caught it eight times over, because a hero is the card thumbnail on every listing page.

What's in this PR

[coderabbitai]

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[Copilot]

🟢 Approval recommended

The updated image references were verified to exist in their respective bundles and align with the PR’s goal of replacing hotlinks and reducing artifact size.

Pull request overview

This PR reduces reliance on hotlinked (third-party) images by updating content to reference localized and re-encoded assets (e.g., .png → .jpg, external URLs → bundled hashed filenames), supporting the repo goal of preventing broken images and keeping the GitHub Pages artifact under size limits.

Changes:

• Updated many posts’ image: frontmatter values to point at re-encoded local .jpg hero images.
• Replaced numerous inline hotlinked image URLs with localized bundle files (including hashed names) and updated image extensions where assets were re-encoded.
• Updated author profile avatarFull and an ad banner image to reference the new local .jpg assets.

File summaries

File	Description
content/posts/2026/08/31/javafx-links-of-august-2026/index.md	Update hero image reference to re-encoded local .jpg.
content/posts/2026/07/31/javafx-links-of-july-2026/index.md	Update hero image reference to re-encoded local .jpg.
content/posts/2026/06/10/spring-ai-agents-no-second-runtime/index.md	Update hero image reference to re-encoded local .jpg.
content/posts/2026/05/31/javafx-links-of-may-2026/index.md	Update hero image reference to re-encoded local .jpg.
content/posts/2026/05/14/boxlang-ai-series-complete-guide-to-building-ai-agents/index.md	Update inline image reference to re-encoded local .jpg.
content/posts/2026/04/30/javafx-links-of-april-2026/index.md	Update hero image reference to re-encoded local .jpg.
content/posts/2026/04/20/spring-ai-amazon-bedrock-sdk-guide/index.md	Update hero image reference to re-encoded local .jpg.
content/posts/2026/03/31/javafx-links-of-march-2026/index.md	Update hero image reference to re-encoded local .jpg.
content/posts/2026/02/28/javafx-links-of-february-2026/index.md	Update hero image reference to re-encoded local .jpg.
content/posts/2026/01/31/javafx-links-of-january-2026/index.md	Update hero image reference to re-encoded local .jpg.
content/posts/2025/12/31/javafx-links-of-december-2025/index.md	Update hero image reference to re-encoded local .jpg.
content/posts/2025/12/12/jakarta-data-makes-persistence-a-breeze/index.md	Update hero image reference to re-encoded local .jpg.
content/posts/2025/11/30/javafx-links-of-november-2025/index.md	Update hero image reference to re-encoded local .jpg.
content/posts/2025/10/31/javafx-links-of-october-2025/index.md	Update hero image reference to re-encoded local .jpg.
content/posts/2025/09/30/javafx-links-of-september-2025/index.md	Update hero image reference to re-encoded local .jpg.
content/posts/2025/08/31/javafx-links-of-august-2025/index.md	Update hero image reference to re-encoded local .jpg.
content/posts/2025/08/11/new-features-in-jakarta-ee-11-with-examples/index.md	Update inline image reference to re-encoded local .jpg.
content/posts/2025/07/31/javafx-links-of-july-2025/index.md	Update hero image reference to re-encoded local .jpg.
content/posts/2025/07/16/getting-started-with-scala/index.md	Update hero image reference to re-encoded local .jpg.
content/posts/2025/07/08/prime-time-the-high-performance-java-event/index.md	Update hero image reference to re-encoded local .jpg.
content/posts/2025/06/29/javafx-links-of-june-2025/index.md	Update hero image reference to re-encoded local .jpg.
content/posts/2025/06/16/foojay-podcast-73/index.md	Update hero image reference to re-encoded local .jpg.
content/posts/2025/06/01/javafx-links-of-may-2025/index.md	Update hero image reference to re-encoded local .jpg.
content/posts/2025/04/30/javafx-links-of-april-2025/index.md	Update hero image reference to re-encoded local .jpg.
content/posts/2025/04/09/webinar-java-ai/index.md	Update inline image reference to re-encoded local .jpg.
content/posts/2025/03/28/javafx-links-of-march-2025/index.md	Update hero image reference to re-encoded local .jpg.
content/posts/2025/03/25/webassembly-on-kubernetes/index.md	Update hero image reference to re-encoded local .jpg.
content/posts/2025/03/01/javafx-links-of-february-2025/index.md	Update hero image reference to re-encoded local .jpg.
content/posts/2025/02/01/javafx-links-of-january-2025/index.md	Update hero image reference to re-encoded local .jpg.
content/posts/2025/01/30/my-first-steps-with-playwright/index.md	Update inline image reference to re-encoded local .jpg.
content/posts/2025/01/30/a-solution-to-the-problem-of-cluster-wide-crds/index.md	Update hero image reference to re-encoded local .jpg.
content/posts/2025/01/29/project-loom-structured-concurrency-java/index.md	Update hero image reference to re-encoded local .jpg.
content/posts/2025/01/28/token-bucket-rate-limiter-redis-java/index.md	Localize an external hotlinked image to a bundled .webp.
content/posts/2025/01/24/receiving-mails-in-java-with-imap-or-pop3/index.md	Update hero image reference to re-encoded local .jpg.
content/posts/2024/12/30/javafx-links-of-december-2024/index.md	Update hero image reference to re-encoded local .jpg.
content/posts/2024/11/30/javafx-links-of-november-2024/index.md	Update hero image reference to re-encoded local .jpg.
content/posts/2024/10/28/javafx-links-of-october-2024/index.md	Update hero image reference to re-encoded local .jpg.
content/posts/2024/09/30/javafx-links-of-september-2024/index.md	Update hero image reference to re-encoded local .jpg.
content/posts/2024/09/02/javafx-links-of-august-2024/index.md	Update hero image reference to re-encoded local .jpg.
content/posts/2024/08/26/debugging-kubernetes-troubleshooting-guide/index.md	Localize an external hotlinked image to a bundled file.
content/posts/2024/07/31/javafx-links-of-july-2024/index.md	Update hero image reference to re-encoded local .jpg.
content/posts/2024/06/30/javafx-links-of-june-2024/index.md	Update hero image reference to re-encoded local .jpg.
content/posts/2024/06/01/javafx-links-of-may-2024/index.md	Update hero image reference to re-encoded local .jpg.
content/posts/2024/04/29/javafx-links-of-april-2024/index.md	Update hero image reference to re-encoded local .jpg.
content/posts/2024/04/03/improving-upon-my-opentelemetry-tracing-demo/index.md	Update inline image reference to re-encoded local .jpg.
content/posts/2024/03/31/javafx-links-of-march-2024/index.md	Update hero image reference to re-encoded local .jpg.
content/posts/2024/03/28/aspect-oriented-programming-aop/index.md	Update hero image reference to re-encoded local .jpg.
content/posts/2024/02/29/javafx-links-of-february-2024/index.md	Update hero image reference to re-encoded local .jpg.
content/posts/2024/01/31/javafx-links-of-january-2024/index.md	Update hero image reference to re-encoded local .jpg.
content/posts/2024/01/26/book-review-tidy-first/index.md	Localize a previously hotlinked image to a bundled .jpg.
content/posts/2024/01/17/payara-platform-roadmap-2024/index.md	Update inline image reference to re-encoded local .jpg.
content/posts/2024/01/03/semantic-versioning-your-java-libraries/index.md	Update hero image reference to re-encoded local .jpg.
content/posts/2023/11/24/java-for-desktop-applications-part-1/index.md	Update hero image reference to re-encoded local .jpg.
content/posts/2023/11/22/feedback-from-calling-rust-from-python/index.md	Update hero image reference to re-encoded local .jpg.
content/posts/2023/10/31/javafx-links-of-october-2023/index.md	Update hero image reference to re-encoded local .jpg.
content/posts/2023/10/21/domain-deadline-dog-driven-development/index.md	Update hero image reference to re-encoded local .jpg.
content/posts/2023/09/30/javafx-links-of-september-2023/index.md	Update hero image reference to re-encoded local .jpg.
content/posts/2023/09/15/system-architecture-move-authentication-to-the-api-gateway/index.md	Update inline image reference to re-encoded local .jpg.
content/posts/2023/08/22/introduction-tower/index.md	Update inline image reference to re-encoded local .jpg.
content/posts/2023/08/04/book-review-openjdk-migration-for-dummies/index.md	Update hero image reference to re-encoded local .jpg.
content/posts/2023/07/14/how-to-share-your-work-with-a-video-or-podcast/index.md	Update gallery image reference to re-encoded local .jpg.
content/posts/2023/06/26/foojay-podcast-26/index.md	Update inline image reference to re-encoded local .jpg.
content/posts/2023/06/19/foojay-podcast-25/index.md	Update hero image reference to re-encoded local .jpg.
content/posts/2023/05/22/foojay-podcast-23/index.md	Update hero image reference to re-encoded local .jpg.
content/posts/2023/05/16/managing-data-residency-concepts-theory/index.md	Update inline image reference to re-encoded local .jpg.
content/posts/2023/05/02/optaplanner-continues-as-timefold/index.md	Update hero image reference to re-encoded local .jpg.
content/posts/2023/05/01/foojay-podcast-21/index.md	Update inline image reference to re-encoded local .jpg.
content/posts/2023/04/14/boldness-in-refactoring/index.md	Update linked thumbnail image reference to re-encoded local .jpg.
content/posts/2023/04/11/hidden-beauties-of-java-enums/index.md	Update hero image reference to re-encoded local .jpg.
content/posts/2023/03/23/event-driven-order-processing-program/index.md	Update inline image reference to re-encoded local .jpg.
content/posts/2023/03/20/foojay-podcast-16/index.md	Update hero image reference to re-encoded local .jpg.
content/posts/2023/02/28/javafx-links-of-february-2023/index.md	Update hero image reference to re-encoded local .jpg.
content/posts/2023/02/24/porting-an-existing-javafx-app-to-ios/index.md	Localize an external hotlinked image to a bundled file.
content/posts/2023/02/20/foojay-podcast-14/index.md	Update hero image reference to re-encoded local .jpg.
content/posts/2023/02/08/jfr-timestamps-and-system-nanotime/index.md	Update hero image reference to re-encoded local .jpg.
content/posts/2023/01/23/foojay-podcast-12/index.md	Update hero image reference to re-encoded local .jpg.
content/posts/2023/01/16/foojay-podcast-11/index.md	Update hero image reference to re-encoded local .jpg.
content/posts/2022/12/27/javafx-links-of-december/index.md	Update hero image reference to re-encoded local .jpg.
content/posts/2022/12/19/foojay-podcast-9/index.md	Update hero image reference to re-encoded local .jpg.
content/posts/2022/12/09/springone-tlv-world-tour-trip-report/index.md	Update hero image reference to re-encoded local .jpg.
content/posts/2022/09/12/kubernetes-gateway-api/index.md	Localize an external image and/or update to bundled .jpg.
content/posts/2022/09/01/can-java-jakarta-ee-do-microservices/index.md	Update hero image reference to re-encoded local .jpg.
content/posts/2022/07/22/the-cost-of-production-blindness/index.md	Update hero image reference to re-encoded local .jpg.
content/posts/2022/07/15/debugging-java-collections-framework-issues-in-production/index.md	Update inline image reference to re-encoded local .jpg.
content/posts/2022/06/21/master-detail-with-hilla/index.md	Localize an external hotlinked image to a bundled file.
content/posts/2022/06/15/microstream-part-2-configure-the-storage-manager/index.md	Update hero image reference to re-encoded local .jpg.
content/posts/2022/06/10/remote-debugging-and-developer-observability/index.md	Update inline image reference to re-encoded local .jpg.
content/posts/2022/05/16/azure-toolkit-for-intellij-april-2022-update/index.md	Update inline image reference to re-encoded local .jpg.
content/posts/2022/05/03/how-to-submit-your-next-article-on-foojay-io/index.md	Update hero image reference to re-encoded local .jpg.
content/posts/2022/04/25/chopping-monolith/index.md	Update image shortcode to re-encoded local .jpg.
content/posts/2022/03/09/vaadin-and-jooq-match-made-in-heaven/index.md	Update hero image reference to re-encoded local .jpg.
content/posts/2022/02/04/video-sdkman-explained/index.md	Update hero image reference to re-encoded local .jpg.
content/posts/2021/11/15/github-actions-with-java-part-2/index.md	Update inline image reference to re-encoded local .jpg.
content/posts/2021/08/20/deep-learning-in-java-for-drug-discovery/index.md	Update hero image reference to re-encoded local .jpg.
content/posts/2021/08/09/new-book-practical-vaadin/index.md	Update hero image reference to re-encoded local .jpg.
content/posts/2021/07/26/neo-stream-search-java-challenge/index.md	Update hero image reference to re-encoded local .jpg.
content/posts/2021/07/21/jedi-lambda-join-java-challenge/index.md	Update hero image reference to re-encoded local .jpg.
content/posts/2021/07/05/soprano-ofnullable-stream-java-challenge/index.md	Update hero image reference to re-encoded local .jpg.
content/posts/2021/06/24/openjdk-and-the-future-of-production-profiling/index.md	Update hero image reference to re-encoded local .jpg.
content/posts/2021/06/24/jdb/index.md	Localize an external hotlinked image to a bundled file.
content/posts/2021/06/02/book-review-java-by-comparison/index.md	Update hero image reference to re-encoded local .jpg.
content/posts/2021/05/25/type-erasure-generics-java-challenge/index.md	Update hero image reference to re-encoded local .jpg.
content/posts/2021/05/17/map-equals-hashcode-java-challenge/index.md	Update hero image reference to re-encoded local .jpg.
content/posts/2021/04/13/deep-dive-into-multi-threading-in-java/index.md	Localize an external hotlinked image to a bundled file.
content/posts/2021/01/11/device-monitoring-with-javafx-and-fxgl/index.md	Update gallery image reference to re-encoded local .jpg.
content/posts/2021/01/08/how-to-bring-your-java-microservices-to-the-cloud/index.md	Update hero image reference to re-encoded local .jpg.
content/posts/2020/11/18/7-ways-to-contribute-to-openjdk/index.md	Update hero image reference to re-encoded local .jpg.
content/posts/2020/11/10/getting-started-with-payara-server/index.md	Update hero image reference to re-encoded local .jpg.
content/authors/wei-lin/_index.md	Update avatarFull reference to re-encoded local .jpg.
content/authors/scott-sellers/_index.md	Update avatarFull reference to re-encoded local .jpg.
content/authors/nataliia/_index.md	Update avatarFull reference to re-encoded local .jpg.
content/authors/mohibul-chowdhury/_index.md	Update avatarFull reference to re-encoded local .jpg.
content/authors/hardiksinghbehl/_index.md	Update avatarFull reference to re-encoded local .jpg.
content/authors/gilbert-kwan/_index.md	Update avatarFull reference to re-encoded local .jpg.
content/authors/geertjan-wielenga/_index.md	Update avatarFull reference to re-encoded local .jpg.
content/authors/aicha-laafia/_index.md	Update avatarFull reference to re-encoded local .jpg.
content/ads/foojay-sustainability-ebook/index.md	Update ad image reference to re-encoded local .jpg.

Review details

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• Comments generated: 0
• Review effort level: Lite

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