--- title: Ports and Adapters in Java: Keeping your core clean description: A practical guide to implementing Ports and Adapters (hexagonal architecture) in Java, using MongoDB as a concrete example. The article demonstrates how to... canonical: https://daily.dev/posts/ports-and-adapters-in-java-keeping-your-core-clean-llji6aloa twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Ports and Adapters in Java: Keeping your core clean | daily.dev og:description: A practical guide to implementing Ports and Adapters (hexagonal architecture) in Java, using MongoDB as a concrete example. The article demonstrates how to... og:url: https://daily.dev/posts/ports-and-adapters-in-java-keeping-your-core-clean-llji6aloa og:image: https://api.daily.dev/og/posts/lLjI6aLOA.png og:image:alt: Ports and Adapters in Java: Keeping your core clean 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. # Ports and Adapters in Java: Keeping your core clean **[MongoDB\_Official](https://daily.dev/sources/mongodb_official)** · [@tonykim4](https://daily.dev/tonykim4) · 0 upvotes · 0 comments ## Summary A practical guide to implementing Ports and Adapters (hexagonal architecture) in Java, using MongoDB as a concrete example. The article demonstrates how to keep domain models free of persistence annotations by defining use-case-oriented port interfaces, creating separate MongoDB adapter classes with explicit mapping layers, and wiring everything together with Spring Boot configuration that stays at the edges. Key benefits covered include faster unit testing with in-memory adapters, localized impact when swapping infrastructure, and long-term maintainability—along with honest trade-offs like added indirection and cognitive overhead. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [adam bien's blog](https://daily.dev/posts/adam-bien-s-blog-tcjohvrip) · Adam Bien · 0 upvotes · 1 comments - [What Spring Boot Taught Me About Clean Architecture](https://daily.dev/posts/what-spring-boot-taught-me-about-clean-architecture-jipdjbyjf) · Javarevisited · 91 upvotes · 3 comments - [Quarkus Insights \#254: Domain-Driven Design and Hexagonal Architecture - Part 2](https://daily.dev/posts/quarkus-insights-254-domain-driven-design-and-hexagonal-architecture---part-2-l0ys2wwrx) · Quarkus · 1 upvotes · 0 comments --- Tags: [#java](https://daily.dev/tags/java), [#mongodb](https://daily.dev/tags/mongodb), [#spring-boot](https://daily.dev/tags/spring-boot), [#domain-driven-design](https://daily.dev/tags/domain-driven-design) [View this post on daily.dev](https://daily.dev/posts/ports-and-adapters-in-java-keeping-your-core-clean-llji6aloa) ```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":"DiscussionForumPosting","mainEntityOfPage":"https://daily.dev/posts/ports-and-adapters-in-java-keeping-your-core-clean-llji6aloa","headline":"Ports and Adapters in Java: Keeping your core clean","text":"Shared: Ports and Adapters in Java: Keeping Your Core Clean","url":"https://daily.dev/posts/ports-and-adapters-in-java-keeping-your-core-clean-llji6aloa","datePublished":"2026-02-19T16:17:07.472Z","dateModified":"2026-02-19T16:17:48.746Z","author":{"@type":"Person","name":"Tony Kim","url":"https://daily.dev/tonykim4","image":"https://media.daily.dev/image/upload/s--GDOa-Pp7--/f_auto/v1740963995/avatars/avatar_f7KG791uirkiv9n7w7R5m","interactionStatistic":{"@type":"InteractionCounter","interactionType":{"@type":"EndorseAction"},"userInteractionCount":40}},"image":"https://media.daily.dev/image/upload/s--0_ODbtD2--/f_auto/v1722860399/public/Placeholder%2008","interactionStatistic":[{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":0},{"@type":"InteractionCounter","interactionType":{"@type":"CommentAction"},"userInteractionCount":0}],"sharedContent":{"@type":"WebPage","url":"https://api.daily.dev/r/ZL3xohAkn"},"isPartOf":{"@type":"WebPage","url":"https://daily.dev/squads/mongodb_official","name":"MongoDB_Official"}} {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://daily.dev"},{"@type":"ListItem","position":2,"name":"MongoDB_Official","item":"https://daily.dev/squads/mongodb_official"},{"@type":"ListItem","position":3,"name":"Ports and Adapters in Java: Keeping your core clean"}]} ```