--- title: What’s going wrong with this Kotlin code? | daily.dev description: A Kotlin developer challenge where a refactored job configuration setup causes a list to contain a Unit value instead of the expected config object, despite... canonical: https://daily.dev/posts/what-s-going-wrong-with-this-kotlin-code--8batwejte twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: What’s going wrong with this Kotlin code? | daily.dev og:description: A Kotlin developer challenge where a refactored job configuration setup causes a list to contain a Unit value instead of the expected config object, despite... og:url: https://daily.dev/posts/what-s-going-wrong-with-this-kotlin-code--8batwejte og:image: https://api.daily.dev/og/posts/8BaTweJte.png og:image:alt: What’s going wrong with this Kotlin code? 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. # What’s going wrong with this Kotlin code? **[Google for Developers](https://daily.dev/sources/googledevelopers)** · 1 min read · 0 upvotes · 0 comments ## Summary A Kotlin developer challenge where a refactored job configuration setup causes a list to contain a Unit value instead of the expected config object, despite the build succeeding. Readers are invited to identify the bug in the comments. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [5 Kotlin Features Every Android Developer Should Actually Be Using part 1](https://daily.dev/posts/5-kotlin-features-every-android-developer-should-actually-be-using-part-1-puwyfdeef) · Medium · 3 upvotes · 0 comments --- Tags: [#kotlin](https://daily.dev/tags/kotlin), [#code-review](https://daily.dev/tags/code-review) [View this post on daily.dev](https://daily.dev/posts/what-s-going-wrong-with-this-kotlin-code--8batwejte) ```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":"What’s going wrong with this Kotlin code?","url":"https://daily.dev/posts/what-s-going-wrong-with-this-kotlin-code--8batwejte","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/what-s-going-wrong-with-this-kotlin-code--8batwejte"},"datePublished":"2026-07-20T13:12:01.198Z","dateModified":"2026-07-20T13:12:23.356Z","description":"A Kotlin developer challenge where a refactored job configuration setup causes a list to contain a Unit value instead of the expected config object, despite...","image":"https://i.ytimg.com/vi/AaWdVp_py4Y/sddefault.jpg","thumbnailUrl":"https://i.ytimg.com/vi/AaWdVp_py4Y/sddefault.jpg","isAccessibleForFree":true,"articleSection":"Google for Developers","inLanguage":"en","publisher":{"@type":"Organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180}},"author":{"@type":"Organization","name":"Google for Developers","logo":"https://media.daily.dev/image/upload/s--jj3nxRoG--/f_auto/v1725035497/logos/googledevelopers","url":"https://daily.dev/sources/googledevelopers"},"commentCount":0,"discussionUrl":"https://daily.dev/posts/what-s-going-wrong-with-this-kotlin-code--8batwejte","interactionStatistic":[{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":0},{"@type":"InteractionCounter","interactionType":{"@type":"CommentAction"},"userInteractionCount":0}],"keywords":"kotlin,code-review","timeRequired":"PT1M","video":{"@type":"VideoObject","name":"What’s going wrong with this Kotlin code?","description":"A Kotlin developer challenge where a refactored job configuration setup causes a list to contain a Unit value instead of the expected config object, despite...","thumbnailUrl":"https://i.ytimg.com/vi/AaWdVp_py4Y/sddefault.jpg","uploadDate":"2026-07-20T13:12:01.198Z","duration":"PT1M","url":"https://api.daily.dev/r/8BaTweJte","embedUrl":"https://www.youtube.com/embed/AaWdVp_py4Y"}} {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://daily.dev"},{"@type":"ListItem","position":2,"name":"Google for Developers","item":"https://daily.dev/sources/googledevelopers"},{"@type":"ListItem","position":3,"name":"What’s going wrong with this Kotlin code?"}]} ```