--- title: Compiled And Tested Code In Javadoc | daily.dev description: JDK 18 introduces JEP 413, which adds a new `@snippet` tag to Javadoc that lets developers reference code from external source files. These external files can... canonical: https://daily.dev/posts/compiled-and-tested-code-in-javadoc-tuhjjo3oj twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Compiled And Tested Code In Javadoc | daily.dev og:description: JDK 18 introduces JEP 413, which adds a new `@snippet` tag to Javadoc that lets developers reference code from external source files. These external files can... og:url: https://daily.dev/posts/compiled-and-tested-code-in-javadoc-tuhjjo3oj og:image: https://api.daily.dev/og/posts/TUHJjO3Oj.png og:image:alt: Compiled And Tested Code In Javadoc og:image:width: 1200 og:image:height: 630 og:locale: 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. # Compiled And Tested Code In Javadoc **[nipafx \(Nicolai Parlog\)](https://daily.dev/sources/nipafx)** · 8 min read · 0 upvotes · 0 comments ## Summary JDK 18 introduces JEP 413, which adds a new `@snippet` tag to Javadoc that lets developers reference code from external source files. These external files can be compiled and tested, ensuring documentation examples stay accurate and up to date. The tag supports regions to show only relevant code sections, text highlighting, linking, and inline-plus-external validation. Projects targeting older Java versions can still use this feature by building with JDK 18 while setting the compiler's `--release` flag to their target version. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [JDK 28: Rich JavaDoc Notes](https://daily.dev/posts/jdk-28-rich-javadoc-notes-reqcgp9wo) · Inside Java · 11 upvotes · 0 comments - [foojay – a place for friends of OpenJDK](https://daily.dev/posts/foojay-a-place-for-friends-of-openjdk-uxwbbkqtb) · Foojay.io · 2 upvotes · 0 comments - [adam bien's blog](https://daily.dev/posts/adam-bien-s-blog-zhafb9kzg) · Adam Bien · 0 upvotes · 0 comments --- Tags: [#testing](https://daily.dev/tags/testing), [#java](https://daily.dev/tags/java) [View this post on daily.dev](https://daily.dev/posts/compiled-and-tested-code-in-javadoc-tuhjjo3oj) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"Compiled And Tested Code In Javadoc","url":"https://daily.dev/posts/compiled-and-tested-code-in-javadoc-tuhjjo3oj","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/compiled-and-tested-code-in-javadoc-tuhjjo3oj"},"datePublished":"2026-03-16T08:13:27.332Z","dateModified":"2026-03-16T08:28:03.062Z","description":"JDK 18 introduces JEP 413, which adds a new `@snippet` tag to Javadoc that lets developers reference code from external source files. 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