{"id":26264,"date":"2025-12-03T09:42:28","date_gmt":"2025-12-03T09:42:28","guid":{"rendered":"https:\/\/pokecon.jp\/job\/?p=26264"},"modified":"2025-12-03T09:42:28","modified_gmt":"2025-12-03T09:42:28","slug":"spring-boot-4-%e3%81%ae%e6%96%b0%e6%a9%9f%e8%83%bd%e3%81%a8%e6%b3%a8%e6%84%8f%e7%82%b9-kotlin-%e7%b7%a8","status":"publish","type":"post","link":"https:\/\/pokecon.jp\/job\/26264\/","title":{"rendered":"Spring Boot 4 \u306e\u65b0\u6a5f\u80fd\u3068\u6ce8\u610f\u70b9 &#8211; Kotlin \u7de8"},"content":{"rendered":"\n<\/p>\n<div>\n<aside class=\"msg message\"><span class=\"msg-symbol\">!<\/span><\/p>\n<div class=\"msg-content\">\n<p data-line=\"1\" class=\"code-line\">\u3053\u306e\u8a18\u4e8b\u306f\u3001<a target=\"_blank\" href=\"https:\/\/adventar.org\/calendars\/11946\" target=\"_blank\" rel=\"nofollow noopener noreferrer\">Money Forward Engineers Advent Calendar 2025<\/a> 12\u67083\u65e5\u306e\u6295\u7a3f\u3067\u3059<\/p>\n<\/div>\n<\/aside>\n<p data-line=\"4\" class=\"code-line\"><a target=\"_blank\" href=\"https:\/\/spring.io\/blog\/2025\/11\/20\/spring-boot-4-0-0-available-now\" target=\"_blank\" rel=\"nofollow noopener noreferrer\">Spring Boot 4<\/a> \u3068 <a target=\"_blank\" href=\"https:\/\/spring.io\/blog\/2025\/11\/13\/spring-framework-7-0-general-availability\" target=\"_blank\" rel=\"nofollow noopener noreferrer\">Spring Framework 7<\/a> \u304c2025\u5e7411\u6708\u306b\u30ea\u30ea\u30fc\u30b9\u3055\u308c\u307e\u3057\u305f\u3002<\/p>\n<p data-line=\"6\" class=\"code-line\"><span class=\"embed-block zenn-embedded zenn-embedded-card\"><iframe id=\"zenn-embedded__b5c45070b86d8\" src=\"https:\/\/embed.zenn.studio\/card#zenn-embedded__b5c45070b86d8\" data-content=\"https%3A%2F%2Fgithub.com%2Fspring-projects%2Fspring-boot%2Fwiki%2FSpring-Boot-4.0-Release-Notes\" frameborder=\"0\" scrolling=\"no\" loading=\"lazy\"><\/iframe><\/span><a target=\"_blank\" href=\"https:\/\/github.com\/spring-projects\/spring-boot\/wiki\/Spring-Boot-4.0-Release-Notes\" style=\"display:none\" target=\"_blank\" rel=\"nofollow noopener noreferrer\">https:\/\/github.com\/spring-projects\/spring-boot\/wiki\/Spring-Boot-4.0-Release-Notes<\/a><\/p>\n<p data-line=\"8\" class=\"code-line\"><span class=\"embed-block zenn-embedded zenn-embedded-card\"><iframe id=\"zenn-embedded__49a6c7946b505\" src=\"https:\/\/embed.zenn.studio\/card#zenn-embedded__49a6c7946b505\" data-content=\"https%3A%2F%2Fblog.jetbrains.com%2Fidea%2F2025%2F11%2Fspring-boot-4%2F\" frameborder=\"0\" scrolling=\"no\" loading=\"lazy\"><\/iframe><\/span><a target=\"_blank\" href=\"https:\/\/blog.jetbrains.com\/idea\/2025\/11\/spring-boot-4\/\" style=\"display:none\" target=\"_blank\" rel=\"nofollow noopener noreferrer\">https:\/\/blog.jetbrains.com\/idea\/2025\/11\/spring-boot-4\/<\/a><\/p>\n<p data-line=\"10\" class=\"code-line\">\u3059\u3067\u306b\u3044\u308d\u3044\u308d\u306a\u5834\u6240\u3067\u3001\u65b0\u3057\u3044\u6a5f\u80fd\u3084\u5909\u66f4\u70b9\u306f\u7d39\u4ecb\u3055\u308c\u3066\u3044\u308b\u3068\u601d\u3046\u306e\u3067\u3059\u304c\u3001\u591a\u304f\u304c Java \u3067\u66f8\u304b\u308c\u305f\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u5411\u3051\u306e\u5185\u5bb9\u3067\u3059\u3002<\/p>\n<p data-line=\"12\" class=\"code-line\">\u3053\u3053\u3067\u306f Kotlin \u3092\u4f7f\u3063\u3066\u3044\u308b Spring \u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u5411\u3051\u306b\u3001\u7279\u306b Kotlin \u306b\u95a2\u9023\u3057\u305f\u5909\u66f4\u70b9\u3084\u6ce8\u610f\u70b9\u3092\u3054\u7d39\u4ecb\u3057\u3088\u3046\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n<p data-line=\"14\" class=\"code-line\">KotlinFest 2025 \u3067\u3001<a target=\"_blank\" href=\"https:\/\/blog.jetbrains.com\/kotlin\/2025\/05\/strategic-partnership-with-spring\/\" target=\"_blank\" rel=\"nofollow noopener noreferrer\">JetBrains \u3068 Spring \u306e\u6226\u7565\u7684\u30d1\u30fc\u30c8\u30ca\u30fc\u30b7\u30c3\u30d7<\/a>\u306e\u767a\u8868\u304c\u3042\u3063\u305f\u5f8c\u306e\u6700\u521d\u306e\u30ea\u30ea\u30fc\u30b9\u3067\u3001Spring \u304c\u62b1\u3048\u308b\u30a8\u30b3\u30b7\u30b9\u30c6\u30e0\u306e Kotlin \u5bfe\u5fdc\u304c\u5f37\u5316\u3055\u308c\u3066\u3044\u308b\u3053\u3068\u3092\u611f\u3058\u53d6\u308c\u308b\u30ea\u30ea\u30fc\u30b9\u3068\u306a\u3063\u3066\u3044\u308b\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n<aside class=\"msg message\"><span class=\"msg-symbol\">!<\/span><\/p>\n<div class=\"msg-content\">\n<p data-line=\"17\" class=\"code-line\">Java \u3082\u542b\u3081\u305f\u3056\u3063\u304f\u308a\u3068\u3057\u305f\u65b0\u6a5f\u80fd\u3084\u5909\u66f4\u70b9\u304c\u77e5\u308a\u305f\u3044\u65b9\u306f\u3001\u307e\u305a JJUG CCC 2025 Fall \u3067\u306e @making \u3055\u3093\u306e\u300c<a target=\"_blank\" href=\"https:\/\/ik.am\/entries\/870\" target=\"_blank\" rel=\"nofollow noopener noreferrer\">\u307e\u3082\u306a\u304f\u30ea\u30ea\u30fc\u30b9! Spring Boot 4<\/a>\u300d\u3068\u3044\u3046\u767a\u8868\u3092\u3054\u89a7\u306b\u306a\u308b\u3068\u826f\u3044\u304b\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n<\/div>\n<\/aside>\n<h2 id=\"kotlin-2.2\" data-line=\"21\" class=\"code-line\">\n Kotlin 2.2<\/h2>\n<p data-line=\"23\" class=\"code-line\">Spring Boot 4 \u304c\u5bfe\u5fdc\u3059\u308b Kotlin \u306e\u30d0\u30fc\u30b8\u30e7\u30f3\u306e\u30d9\u30fc\u30b9\u30e9\u30a4\u30f3\u304c 2.2 \u306b\u306a\u308a\u307e\u3057\u305f\u3002<\/p>\n<p data-line=\"25\" class=\"code-line\"><span class=\"embed-block zenn-embedded zenn-embedded-card\"><iframe id=\"zenn-embedded__ea17de2cea6fd\" src=\"https:\/\/embed.zenn.studio\/card#zenn-embedded__ea17de2cea6fd\" data-content=\"https%3A%2F%2Fkotlinlang.org%2Fdocs%2Fwhatsnew22.html\" frameborder=\"0\" scrolling=\"no\" loading=\"lazy\"><\/iframe><\/span><a target=\"_blank\" href=\"https:\/\/kotlinlang.org\/docs\/whatsnew22.html\" style=\"display:none\" target=\"_blank\" rel=\"nofollow noopener noreferrer\">https:\/\/kotlinlang.org\/docs\/whatsnew22.html<\/a><\/p>\n<p data-line=\"27\" class=\"code-line\"><span class=\"embed-block zenn-embedded zenn-embedded-card\"><iframe id=\"zenn-embedded__da82faf267655\" src=\"https:\/\/embed.zenn.studio\/card#zenn-embedded__da82faf267655\" data-content=\"https%3A%2F%2Fkotlinlang.org%2Fdocs%2Fcompatibility-guide-22.html\" frameborder=\"0\" scrolling=\"no\" loading=\"lazy\"><\/iframe><\/span><a target=\"_blank\" href=\"https:\/\/kotlinlang.org\/docs\/compatibility-guide-22.html\" style=\"display:none\" target=\"_blank\" rel=\"nofollow noopener noreferrer\">https:\/\/kotlinlang.org\/docs\/compatibility-guide-22.html<\/a><\/p>\n<p data-line=\"29\" class=\"code-line\">Spring Boot 3 \u3067\u306f 1.9 \u7cfb\u3060\u3063\u305f\u306e\u3067\u3001\u3053\u308c\u307e\u3067\u306f\u6700\u65b0\u306e Kotlin \u306e\u6069\u6075\u3092\u53d7\u3051\u308b\u4e8b\u304c\u3067\u304d\u307e\u305b\u3093\u3067\u3057\u305f\u304c\u3001\u3064\u3044\u306b Spring \u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3082 Kotlin 2 \u306b\u5bfe\u5fdc\u3057\u307e\u3057\u305f\u3002<\/p>\n<p data-line=\"31\" class=\"code-line\">Kotlin 2 \u306f\u3001K2 \u30b3\u30f3\u30d1\u30a4\u30e9\u306e\u63a1\u7528\u3084\u3001\u8a00\u8a9e\u6a5f\u80fd\u306e\u62e1\u5f35\u306a\u3069\u3001Kotlin \u306b\u3068\u3063\u3066\u5927\u304d\u306a\u30de\u30a4\u30eb\u30b9\u30c8\u30fc\u30f3\u3067\u3059\u3002<\/p>\n<p data-line=\"33\" class=\"code-line\">\u4e00\u90e8\u306e Kotlin \u30e9\u30a4\u30d6\u30e9\u30ea\u306f\u3001\u3059\u3067\u306b\u4f9d\u5b58\u304c Kotlin &gt;= 2.1 \u4ee5\u4e0a\u306b\u306a\u3063\u3066\u3044\u3066\u3001\u6700\u65b0\u7248\u3092\u4f7f\u3048\u306a\u304f\u3066\u56f0\u308b Spring \u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3082\u3042\u3063\u305f\u306e\u3067\u306f\u306a\u3044\u306e\u3067\u3057\u3087\u3046\u304b\u3002<\/p>\n<aside class=\"msg message\"><span class=\"msg-symbol\">!<\/span><\/p>\n<div class=\"msg-content\">\n<p data-line=\"36\" class=\"code-line\">Kotlin \u306f 1.9 \u3067\u3042\u3063\u3066\u3082\u3001\u6b21\u306e\u30d0\u30fc\u30b8\u30e7\u30f3\u306e\u30ea\u30ea\u30fc\u30b9\u307e\u3067\u306f\u30d0\u30a4\u30ca\u30ea\u4e92\u63db\u304c\u30b5\u30dd\u30fc\u30c8\u3055\u308c\u3066\u3044\u308b\u306e\u3067\u30012.0 \u307e\u3067\u306f\u554f\u984c\u306a\u304f\u52d5\u4f5c\u3057\u307e\u3059<br \/><a target=\"_blank\" href=\"https:\/\/kotlinlang.org\/docs\/kotlin-evolution-principles.html#evolving-the-binary-format\" target=\"_blank\" rel=\"nofollow noopener noreferrer\">https:\/\/kotlinlang.org\/docs\/kotlin-evolution-principles.html#evolving-the-binary-format<\/a><\/p>\n<\/div>\n<\/aside>\n<p data-line=\"40\" class=\"code-line\">1.9 \u304b\u3089\u6bd4\u3079\u3066\u30012.2 \u3078\u306e\u6a5f\u80fd\u9762\u3067\u306e\u5927\u304d\u306a\u5909\u66f4\u306b\u306f\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u3082\u306e\u304c\u3042\u308a\u307e\u3059<\/p>\n<h2 id=\"jspecify-%E3%81%AB%E3%82%88%E3%82%8B-null-safety\" data-line=\"53\" class=\"code-line\">\n JSpecify \u306b\u3088\u308b Null-Safety<\/h2>\n<p data-line=\"55\" class=\"code-line\">JSpecify \u3068\u306f\u3001\u5f93\u6765\u304b\u3089\u4f7f\u308f\u308c\u3066\u3044\u3066\u8fd1\u5e74\u9032\u5316\u304c\u6b62\u307e\u3063\u3066\u3044\u305f <a target=\"_blank\" href=\"https:\/\/jcp.org\/en\/jsr\/proposalDetails?id=305\" target=\"_blank\" rel=\"nofollow noopener noreferrer\">JSR-305<\/a> \u306b\u5909\u308f\u308b Null-Safety \u306e\u305f\u3081\u306e\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u3067\u3059\u3002<\/p>\n<p data-line=\"57\" class=\"code-line\"><span class=\"embed-block zenn-embedded zenn-embedded-card\"><iframe id=\"zenn-embedded__3967ce13e5e56\" src=\"https:\/\/embed.zenn.studio\/card#zenn-embedded__3967ce13e5e56\" data-content=\"https%3A%2F%2Fjspecify.dev%2F\" frameborder=\"0\" scrolling=\"no\" loading=\"lazy\"><\/iframe><\/span><a target=\"_blank\" href=\"https:\/\/jspecify.dev\/\" style=\"display:none\" target=\"_blank\" rel=\"nofollow noopener noreferrer\">https:\/\/jspecify.dev\/<\/a><\/p>\n<p data-line=\"59\" class=\"code-line\">Spring \u306f\u6700\u8fd1\u306e\u30d0\u30fc\u30b8\u30e7\u30f3\u3067 JSpecify \u306b\u3088\u308b Null-Safety \u306a API \u306e\u5c0e\u5165\u3092\u9032\u3081\u3066\u304a\u308a\u3001Spring 4 \u30ea\u30ea\u30fc\u30b9\u306e\u30bf\u30a4\u30df\u30f3\u30b0\u3067\u3059\u3067\u306b\u591a\u304f\u306e\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u3067\u3059\u3067\u306b\u5bfe\u5fdc\u304c\u5b8c\u4e86\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<p data-line=\"61\" class=\"code-line\">Kotlin \u306f\u3059\u3067\u306b JSpecify \u306e\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u306b\u5bfe\u5fdc\u3057\u3066\u304a\u308a\u3001JSpecify \u306b\u5f93\u3063\u305f Java \u306e\u30b3\u30fc\u30c9\u3092 Kotlin \u304b\u3089\u64cd\u4f5c\u3059\u308b\u969b\u306b\u3082 Null-Safety \u306e\u6069\u6075\u3092\u53d7\u3051\u308b\u4e8b\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p data-line=\"63\" class=\"code-line\"><span class=\"embed-block zenn-embedded zenn-embedded-card\"><iframe id=\"zenn-embedded__2f90bb98ebfd\" src=\"https:\/\/embed.zenn.studio\/card#zenn-embedded__2f90bb98ebfd\" data-content=\"https%3A%2F%2Fspring.io%2Fblog%2F2025%2F11%2F12%2Fnull-safe-applications-with-spring-boot-4\" frameborder=\"0\" scrolling=\"no\" loading=\"lazy\"><\/iframe><\/span><a target=\"_blank\" href=\"https:\/\/spring.io\/blog\/2025\/11\/12\/null-safe-applications-with-spring-boot-4\" style=\"display:none\" target=\"_blank\" rel=\"nofollow noopener noreferrer\">https:\/\/spring.io\/blog\/2025\/11\/12\/null-safe-applications-with-spring-boot-4<\/a><\/p>\n<p data-line=\"65\" class=\"code-line\">\u3053\u308c\u307e\u3067\u306f Java \u3067\u66f8\u304b\u308c\u305f Spring \u306e\u30af\u30e9\u30b9\u3092\u89e6\u308b\u969b\u306b\u3001Kotlin \u304a\u3044\u3066\u306f\u8a00\u8a9e\u30ec\u30d9\u30eb\u3067 Null-Safety \u304c\u5f37\u5236\u3055\u308c\u3066\u3044\u308b\u306e\u3067\u3001Nullable \u306a\u306e\u304b Not-Null \u306a\u306e\u304b\u304c\u5224\u65ad\u304c\u3067\u304d\u305a <code>T!<\/code>(\u4f8b\u3048\u3070 <code>String!<\/code>) \u306e\u3088\u3046\u306a platform-type \u306b\u5909\u63db\u3055\u308c\u3066\u3057\u307e\u3044\u3001Null-Safety \u306e\u6069\u6075\u3092\u53d7\u3051\u308b\u4e8b\u304c\u3067\u304d\u306a\u3044\u5834\u9762\u304c\u591a\u304f\u3042\u308a\u307e\u3057\u305f\u3002<\/p>\n<p data-line=\"67\" class=\"code-line\">JSpecify \u5bfe\u5fdc\u304c Spring \u3067\u3082\u6d78\u900f\u3057\u305f\u4e8b\u3067\u3001Kotlin \u306b\u304a\u3044\u3066 Spring \u306e\u30af\u30e9\u30b9\u3082 Kotlin \u3067\u66f8\u304b\u308c\u305f\u30af\u30e9\u30b9\u3068\u540c\u69d8\u306b Null-Safety \u3092\u4fdd\u3063\u305f\u307e\u307e\u64cd\u4f5c\u3059\u308b\u4e8b\u304c\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u3002\u826f\u3044\u3067\u3059\u306d\uff01<\/p>\n<h2 id=\"jackson-3-%E3%82%B5%E3%83%9D%E3%83%BC%E3%83%88\" data-line=\"69\" class=\"code-line\">\n Jackson 3 \u30b5\u30dd\u30fc\u30c8<\/h2>\n<p data-line=\"71\" class=\"code-line\">Spring Boot 4 \u3067\u306f\u3001\u3053\u308c\u307e\u3067\u306e Jackson 2 \u304b\u3089 Jackson 3 \u304c\u6a19\u6e96\u3067\u4f7f\u308f\u308c\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3057\u305f\u3002<\/p>\n<p data-line=\"73\" class=\"code-line\"><span class=\"embed-block zenn-embedded zenn-embedded-card\"><iframe id=\"zenn-embedded__a2181b69decb2\" src=\"https:\/\/embed.zenn.studio\/card#zenn-embedded__a2181b69decb2\" data-content=\"https%3A%2F%2Fspring.io%2Fblog%2F2025%2F10%2F07%2Fintroducing-jackson-3-support-in-spring\" frameborder=\"0\" scrolling=\"no\" loading=\"lazy\"><\/iframe><\/span><a target=\"_blank\" href=\"https:\/\/spring.io\/blog\/2025\/10\/07\/introducing-jackson-3-support-in-spring\" style=\"display:none\" target=\"_blank\" rel=\"nofollow noopener noreferrer\">https:\/\/spring.io\/blog\/2025\/10\/07\/introducing-jackson-3-support-in-spring<\/a><\/p>\n<p data-line=\"75\" class=\"code-line\">Jackson 3 \u3067\u306f\u3001<a target=\"_blank\" href=\"https:\/\/github.com\/FasterXML\/jackson-future-ideas\/wiki\/JSTEP-2\" target=\"_blank\" rel=\"nofollow noopener noreferrer\">\u591a\u304f\u306e\u30c7\u30d5\u30a9\u30eb\u30c8\u8a2d\u5b9a\u304c\u898b\u76f4\u3055\u308c\u3066<\/a>\u304a\u308a\u3001Kotlin Module \u306b\u304a\u3044\u3066\u3082\u4f8b\u5916\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n<p data-line=\"77\" class=\"code-line\">\u4ee5\u4e0b\u306b\u3001\u7279\u306b Kotlin \u306b\u304a\u3044\u3066\u6ce8\u610f\u3059\u308b\u3079\u304d\u8a2d\u5b9a\u306e\u5909\u66f4\u3092\u5217\u6319\u3057\u307e\u3059\u3002<\/p>\n<h3 id=\"deserializationfeature.fail_on_null_for_primitives\" data-line=\"79\" class=\"code-line\">\n <code>DeserializationFeature.FAIL_ON_NULL_FOR_PRIMITIVES<\/code><br \/>\n<\/h3>\n<p data-line=\"81\" class=\"code-line\">\u3053\u308c\u307e\u3067\u306e\u3000Jackson 2 \u306e\u30c7\u30d5\u30a9\u30eb\u30c8\u8a2d\u5b9a\u306f Kotlin \u3067\u30d7\u30ea\u30df\u30c6\u30a3\u30d6\u578b\u3092 Non-Null \u3067\u6307\u5b9a\u3057\u3066\u3044\u3066\u3082\u3001<code>null<\/code> \u3092\u30c7\u30b7\u30ea\u30a2\u30e9\u30a4\u30ba\u3057\u305f\u969b\u306b null \u306b\u306a\u3089\u306a\u3044\u3068\u8a00\u3046\u554f\u984c\u304c\u3042\u308a\u307e\u3057\u305f\u3002<\/p>\n<div class=\"code-block-container\">\n<pre class=\"language-kotlin\"><code class=\"language-kotlin code-line\" data-line=\"83\"><span class=\"token keyword\">data<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token function\">Some<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">val<\/span> value<span class=\"token operator\">:<\/span> Int<span class=\"token punctuation\">)<\/span>\n\n<span class=\"token keyword\">val<\/span> mapper <span class=\"token operator\">=<\/span> <span class=\"token function\">jacksonObjectMapper<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span>\nmapper<span class=\"token punctuation\">.<\/span>readValue<span class=\"token operator\">&lt;<\/span>Some<span class=\"token operator\">&gt;<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string-literal multiline\"><span class=\"token string\">\"\"\"{\"value\":null}\"\"\"<\/span><\/span><span class=\"token punctuation\">)<\/span> \n<\/code><\/pre>\n<\/div>\n<p data-line=\"90\" class=\"code-line\">\u7279\u306b\u3001Null-Safety \u304c\u53b3\u5bc6\u306a Kotlin \u3067\u306f\u76f4\u611f\u306b\u53cd\u3059\u308b\u6319\u52d5\u3068\u306a\u3063\u3066\u3044\u307e\u3057\u305f\u3002\u3053\u306e\u554f\u984c\u304c\u3001<code>DeserializationFeature.FAIL_ON_NULL_FOR_PRIMITIVES<\/code> \u30c7\u30d5\u30a9\u30eb\u30c8\u5024\u304c <code>true<\/code> \u306b\u5909\u66f4\u306b\u3088\u3063\u3066\u6539\u5584\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n<h3 id=\"kotlinfeature.strictnullchecks\" data-line=\"92\" class=\"code-line\">\n <code>KotlinFeature.StrictNullChecks<\/code><br \/>\n<\/h3>\n<p data-line=\"94\" class=\"code-line\">Jackson 2 \u3067\u306f\u3001Kotlin \u3067\u660e\u793a\u7684\u306b Non-Null \u306e\u578b\u3092 <code>List<\/code> \u306a\u3069 Collection \u578b\u306e\u578b\u5f15\u6570\u3068\u3057\u3066\u6307\u5b9a\u3057\u3066\u3044\u3066\u3082\u3001<code>null<\/code> \u304c\u5165\u3063\u3066\u304d\u3066\u3057\u307e\u3046\u3068\u8a00\u3046\u554f\u984c\u304c\u3042\u308a\u307e\u3057\u305f\u3002<\/p>\n<div class=\"code-block-container\">\n<pre class=\"language-kotlin\"><code class=\"language-kotlin code-line\" data-line=\"96\"><span class=\"token keyword\">val<\/span> mapper <span class=\"token operator\">=<\/span> <span class=\"token function\">jacksonObjectMapper<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span>\n<span class=\"token keyword\">val<\/span> json <span class=\"token operator\">=<\/span> <span class=\"token string-literal multiline\"><span class=\"token string\">\"\"\"[\"A\", null]\"\"\"<\/span><\/span>\n<span class=\"token keyword\">val<\/span> list <span class=\"token operator\">=<\/span> mapper<span class=\"token punctuation\">.<\/span><span class=\"token function\">readValue<\/span><span class=\"token punctuation\">(<\/span>json<span class=\"token punctuation\">,<\/span> jacksonTypeRef<span class=\"token operator\">&lt;<\/span>List<span class=\"token operator\">&lt;<\/span>String<span class=\"token operator\">&gt;<\/span><span class=\"token operator\">&gt;<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> \n<span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span>list<span class=\"token punctuation\">)<\/span> \n<\/code><\/pre>\n<\/div>\n<p data-line=\"103\" class=\"code-line\"><code>KotlinFeature.StrictNullChecks<\/code> \u306f\u4ee5\u524d\u304b\u3089\u63d0\u4f9b\u3055\u308c\u3066\u3044\u305f\u306e\u3067\u3059\u304c\u3001<a target=\"_blank\" href=\"https:\/\/github.com\/FasterXML\/jackson-module-kotlin\/pull\/885\" target=\"_blank\" rel=\"nofollow noopener noreferrer\">\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306e\u554f\u984c<\/a>\u304c\u3042\u308a\u3001\u30c7\u30d5\u30a9\u30eb\u30c8\u3067\u6709\u52b9\u306b\u306f\u3055\u308c\u3066\u3044\u307e\u305b\u3093\u3067\u3057\u305f\u3002Jackson 3 \u3067\u306f\u3001\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u554f\u984c\u304c\u89e3\u6c7a\u3055\u308c\u305f\u3068\u8a00\u3046\u3053\u3068\u3067\u3001\u30c7\u30d5\u30a9\u30eb\u30c8\u3067\u6709\u52b9\u306b\u306a\u308a\u6539\u5584\u3055\u308c\u307e\u3057\u305f\u3002<\/p>\n<h3 id=\"kotlinfeature.singletonsupport\" data-line=\"105\" class=\"code-line\">\n <code>KotlinFeature.SingletonSupport<\/code><br \/>\n<\/h3>\n<p data-line=\"107\" class=\"code-line\">Kotlin \u306b\u306f <code>object<\/code> \u3068\u3044\u3046\u30b7\u30f3\u30b0\u30eb\u30c8\u30f3\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u751f\u6210\u3059\u308b\u305f\u3081\u306e\u5c02\u7528\u306e\u5ba3\u8a00\u304c\u7528\u610f\u3055\u308c\u3066\u3044\u307e\u3059\u304c\u3001Jackson 2 \u306e\u30c7\u30d5\u30a9\u30eb\u30c8\u5024\u3067\u306f\u6b63\u3057\u304f\u5bfe\u5fdc\u3055\u308c\u3066\u3044\u307e\u305b\u3093\u3067\u3057\u305f\u3002<\/p>\n<div class=\"code-block-container\">\n<pre class=\"language-kotlin\"><code class=\"language-kotlin code-line\" data-line=\"109\"><span class=\"token keyword\">object<\/span> Singleton\n\n<span class=\"token keyword\">val<\/span> mapper <span class=\"token operator\">=<\/span> <span class=\"token function\">jacksonObjectMapper<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span>\n<span class=\"token keyword\">val<\/span> json <span class=\"token operator\">=<\/span> mapper<span class=\"token punctuation\">.<\/span><span class=\"token function\">writeValueAsString<\/span><span class=\"token punctuation\">(<\/span>Singleton<span class=\"token punctuation\">)<\/span>\n<span class=\"token keyword\">val<\/span> deserialized <span class=\"token operator\">=<\/span> mapper<span class=\"token punctuation\">.<\/span>readValue<span class=\"token operator\">&lt;<\/span>Singleton<span class=\"token operator\">&gt;<\/span><span class=\"token punctuation\">(<\/span>json<span class=\"token punctuation\">)<\/span>\ndeserialized <span class=\"token operator\">==<\/span> Singleton \n<\/code><\/pre>\n<\/div>\n<p data-line=\"118\" class=\"code-line\">\u3053\u306e\u305f\u3081\u3001<code>object<\/code> \u3092\u542b\u3080\u30af\u30e9\u30b9\u3092\u30c7\u30b7\u30ea\u30a2\u30e9\u30a4\u30ba\u3057\u305f\u3068\u3057\u3066\u3082\u3001\u6b63\u3057\u304f\u6bd4\u8f03\u304c\u3055\u308c\u305a\u76f4\u611f\u306b\u53cd\u3059\u308b\u7d50\u679c\u3068\u306a\u3063\u3066\u3044\u307e\u3057\u305f\u3002\u3053\u306e\u554f\u984c\u304c\u3001<code>KotlinFeature.SingletonSupport<\/code> \u304c\u30c7\u30d5\u30a9\u30eb\u30c8\u3067\u6709\u52b9\u306b\u306a\u308b\u3053\u3068\u3067\u6539\u5584\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n<h2 id=\"kotlinx-serialization\" data-line=\"120\" class=\"code-line\">\n kotlinx-serialization<\/h2>\n<p data-line=\"122\" class=\"code-line\">Kotlin \u306f kotlinx-serialization \u3068\u3044\u3046\u5c02\u7528\u306e\u30b7\u30ea\u30a2\u30e9\u30a4\u30ba\u30e9\u30a4\u30d6\u30e9\u30ea\u3092\u6301\u3063\u3066\u3044\u3066\u3001\u30ea\u30d5\u30ec\u30af\u30b7\u30e7\u30f3\u3092\u4f7f\u308f\u306a\u3044\u5b9f\u88c5\u306b\u306a\u3063\u3066\u3044\u305f\u308a\u3001<code>sealed class<\/code> \u306a\u3069 Kotlin \u7279\u6709\u306e\u578b\u306b\u5bfe\u5fdc\u3057\u3066\u3044\u305f\u308a\u3068\u3001Jackson \u306b\u6bd4\u3079\u3066\u591a\u304f\u306e\u5229\u70b9\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p data-line=\"124\" class=\"code-line\"><span class=\"embed-block zenn-embedded zenn-embedded-card\"><iframe id=\"zenn-embedded__067e3917edbe1\" src=\"https:\/\/embed.zenn.studio\/card#zenn-embedded__067e3917edbe1\" data-content=\"https%3A%2F%2Fkotlinlang.org%2Fdocs%2Fserialization.html\" frameborder=\"0\" scrolling=\"no\" loading=\"lazy\"><\/iframe><\/span><a target=\"_blank\" href=\"https:\/\/kotlinlang.org\/docs\/serialization.html\" style=\"display:none\" target=\"_blank\" rel=\"nofollow noopener noreferrer\">https:\/\/kotlinlang.org\/docs\/serialization.html<\/a><\/p>\n<p data-line=\"126\" class=\"code-line\">\u3053\u308c\u307e\u3067\u3082\u3001kotlinx-serialization \u3078\u306e\u5bfe\u5fdc\u306f\u3055\u308c\u3066\u3044\u3066 Spring \u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u5185\u3067\u3082\u30b5\u30dd\u30fc\u30c8\u3055\u308c\u3066\u3044\u307e\u3057\u305f\u304c\u3001Spring Boot 4 \u304b\u3089 kotlinx-serialization \u306e\u305f\u3081\u306e Spring Boot Starter <code>spring-boot-starter-kotlin-serialization<\/code> \u304c\u63d0\u4f9b\u3055\u308c\u308b\u3053\u3068\u3068\u306a\u308a\u307e\u3057\u305f\u3002<\/p>\n<p data-line=\"128\" class=\"code-line\">\u3053\u306e\u30b9\u30bf\u30fc\u30bf\u30fc\u3092\u8aad\u307f\u8fbc\u3080\u3053\u3068\u3067\u3001JSON \u3078\u306e\u5909\u63db\u3092\u7c21\u5358\u306b kotlinx-serialization \u306b\u5bfe\u5fdc\u3055\u305b\u308b\u4e8b\u304c\u3067\u304d\u307e\u3059\u3002\u30b3\u30f3\u30c8\u30ed\u30fc\u30e9\u30fc\u306e\u30ea\u30af\u30a8\u30b9\u30c8\u3084\u30ec\u30b9\u30dd\u30f3\u30b9\u306b\u3082\u554f\u984c\u306a\u304f\u4f7f\u3048\u307e\u3059\u3002<\/p>\n<div class=\"code-block-container\">\n<pre class=\"language-kotlin\"><code class=\"language-kotlin code-line\" data-line=\"130\"><span class=\"token annotation builtin\">@Serializable<\/span>\n<span class=\"token keyword\">data<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token function\">HelloResponse<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">val<\/span> name<span class=\"token operator\">:<\/span> String<span class=\"token punctuation\">)<\/span>\n\n<span class=\"token annotation builtin\">@Controller<\/span>\n<span class=\"token keyword\">class<\/span> HelloController <span class=\"token punctuation\">{<\/span>\n    <span class=\"token annotation builtin\">@GetMapping<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string-literal singleline\"><span class=\"token string\">\"\/hello\"<\/span><\/span><span class=\"token punctuation\">)<\/span>\n    <span class=\"token keyword\">fun<\/span> <span class=\"token function\">hello<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token operator\">:<\/span> HelloResponse <span class=\"token operator\">=<\/span> <span class=\"token function\">HelloResponse<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string-literal singleline\"><span class=\"token string\">\"hello\"<\/span><\/span><span class=\"token punctuation\">)<\/span>\n<span class=\"token punctuation\">}<\/span>\n<\/code><\/pre>\n<\/div>\n<p data-line=\"141\" class=\"code-line\">\u4e00\u65b9\u3067\u3001Spring \u304c\u4f9d\u5b58\u3059\u308b\u591a\u304f\u306e\u30e9\u30a4\u30d6\u30e9\u30ea\u3084\u3001\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u306f\u3001Jackson \u3067\u3042\u308b\u4e8b\u304c\u524d\u63d0\u3067\u66f8\u304b\u308c\u3066\u3044\u305f\u308a\u3082\u3059\u308b\u306e\u3067\u3001\u4e00\u90e8\u306e\u307f\u3092 kotlinx-serialization \u306b\u7f6e\u304d\u63db\u3048\u308b\u3053\u3068\u3067\u5927\u304d\u306a\u6069\u6075\u304c\u3042\u308b\u304b\u306f\u3001\u614e\u91cd\u306b\u691c\u8a0e\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u305d\u3046\u3067\u3059\u3002<\/p>\n<h2 id=\"junit-6\" data-line=\"143\" class=\"code-line\">\n JUnit 6<\/h2>\n<p data-line=\"145\" class=\"code-line\">Spring Boot 4 \u3067\u306f\u3001JUnit 6 \u304c\u6a19\u6e96\u306e\u30c6\u30b9\u30c8\u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n<p data-line=\"147\" class=\"code-line\"><span class=\"embed-block zenn-embedded zenn-embedded-card\"><iframe id=\"zenn-embedded__cd9a5ed3f85d3\" src=\"https:\/\/embed.zenn.studio\/card#zenn-embedded__cd9a5ed3f85d3\" data-content=\"https%3A%2F%2Fdocs.junit.org%2F6.0.0%2Frelease-notes%2F%23release-notes-6.0.0\" frameborder=\"0\" scrolling=\"no\" loading=\"lazy\"><\/iframe><\/span><a target=\"_blank\" href=\"https:\/\/docs.junit.org\/6.0.0\/release-notes\/#release-notes-6.0.0\" style=\"display:none\" target=\"_blank\" rel=\"nofollow noopener noreferrer\">https:\/\/docs.junit.org\/6.0.0\/release-notes\/#release-notes-6.0.0<\/a><\/p>\n<p data-line=\"149\" class=\"code-line\">JUnit 6 \u304b\u3089\u306f\u3001Kotlin \u5bfe\u5fdc\u3082\u5f37\u5316\u3055\u308c\u3066\u3044\u3066\u3001\u30c6\u30b9\u30c8\u30e1\u30bd\u30c3\u30c9\u3092 <code>suspend fun<\/code> \u3067\u5bfe\u5fdc\u3059\u308b\u4e8b\u304c\u53ef\u80fd\u306b\u306a\u3063\u3066\u3044\u3066\u3001Coroutines \u5bfe\u5fdc\u304c\u5927\u5e45\u306b\u5f37\u5316\u3055\u308c\u307e\u3057\u305f\uff01<\/p>\n<p data-line=\"151\" class=\"code-line\">\u3053\u308c\u307e\u3067\u306e\u3001<code>runTest {}<\/code> \u3084 <code>runBlocking {}<\/code> \u3092\u4f7f\u3063\u305f workaround \u3092\u6b62\u3081\u308b\u4e8b\u304c\u3067\u304d\u3066\u30c6\u30b9\u30c8\u30b3\u30fc\u30c9\u304c\u30b9\u30c3\u30ad\u30ea\u3057\u305d\u3046\u3067\u3059\u3002\u3068\u306f\u3044\u3048\u3001<code>runTest<\/code> \u306b\u306f\u4eee\u60f3\u6642\u9593\u306e\u5bfe\u5fdc\u3082\u3042\u308b\u306e\u3067\u3001\u305d\u3061\u3089\u304c\u5fc5\u8981\u3067\u3042\u308c\u3070\u5f15\u304d\u7d9a\u304d\u5229\u7528\u3059\u308b\u4e8b\u3082\u3067\u304d\u307e\u3059\u3002<\/p>\n<div class=\"code-block-container\">\n<pre class=\"language-kotlin\"><code class=\"language-kotlin code-line\" data-line=\"153\"><span class=\"token annotation builtin\">@Test<\/span>\n<span class=\"token keyword\">suspend<\/span> <span class=\"token keyword\">fun<\/span> <span class=\"token function\">`should be delayed 1 second`<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\n    <span class=\"token function\">delay<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">.<\/span>seconds<span class=\"token punctuation\">)<\/span>\n<span class=\"token punctuation\">}<\/span>\n<\/code><\/pre>\n<\/div>\n<h2 id=\"bean-registration-dsl\" data-line=\"160\" class=\"code-line\">\n Bean Registration DSL<\/h2>\n<p data-line=\"162\" class=\"code-line\">\u3053\u308c\u307e\u3067\u3082 Spring \u306e Kotlin \u30b5\u30dd\u30fc\u30c8\u306e\u4e00\u74b0\u3068\u3057\u3066\u3001Bean Definition DSL \u304c\u30b5\u30dd\u30fc\u30c8\u3055\u308c\u3066\u3044\u307e\u3057\u305f\u304c\u3001\u5b8c\u5168\u306b Spring \u306e\u4ed5\u7d44\u307f\u306b\u53d6\u308a\u5165\u308c\u3089\u308c\u3066\u3044\u308b\u308f\u3051\u3067\u306f\u306a\u304f\u3001\u82e5\u5e72\u4f7f\u3044\u306b\u304f\u3044\u3082\u306e\u3067\u3057\u305f\u3002<\/p>\n<p data-line=\"164\" class=\"code-line\">Spring Boot 4 \u304b\u3089 Programmatic Bean Registration \u3068\u3057\u3066\u3055\u3089\u306b\u4fbf\u5229\u306b\u306a\u308a\u3001Java \u3068 Kotlin \u3078\u63d0\u4f9b\u3055\u308c\u308b\u3053\u3068\u3068\u306a\u308a\u307e\u3057\u305f\u3002<\/p>\n<p data-line=\"166\" class=\"code-line\"><span class=\"embed-block zenn-embedded zenn-embedded-card\"><iframe id=\"zenn-embedded__408cf916d1f62\" src=\"https:\/\/embed.zenn.studio\/card#zenn-embedded__408cf916d1f62\" data-content=\"https%3A%2F%2Fdocs.spring.io%2Fspring-framework%2Freference%2Fcore%2Fbeans%2Fjava%2Fprogrammatic-bean-registration.html\" frameborder=\"0\" scrolling=\"no\" loading=\"lazy\"><\/iframe><\/span><a target=\"_blank\" href=\"https:\/\/docs.spring.io\/spring-framework\/reference\/core\/beans\/java\/programmatic-bean-registration.html\" style=\"display:none\" target=\"_blank\" rel=\"nofollow noopener noreferrer\">https:\/\/docs.spring.io\/spring-framework\/reference\/core\/beans\/java\/programmatic-bean-registration.html<\/a><\/p>\n<p data-line=\"168\" class=\"code-line\"><code>BeanRegistrarDsl<\/code> \u3068\u3044\u3046 DSL \u304c\u63d0\u4f9b\u3055\u308c\u3001\u3053\u306e\u30af\u30e9\u30b9\u3092\u5b9f\u88c5\u3057\u305f bean \u3092\u5b9a\u7fa9\u3059\u308b\u3053\u3068\u3067\u3001\u3053\u308c\u307e\u3067\u306e\u3088\u3046\u306b ApplicationContext \u306b\u624b\u52d5\u3067\u5dee\u3057\u8fbc\u3080\u5fc5\u8981\u304c\u306a\u304f\u306a\u308a\u307e\u3059\u3002<\/p>\n<p data-line=\"170\" class=\"code-line\">\u3053\u306e Bean Registration DSL \u3092\u5229\u7528\u3059\u308b\u4e8b\u3067\u3001\u4ed6\u306e Pure Kotlin \u306a DI \u30e9\u30a4\u30d6\u30e9\u30ea\u306b\u8fd1\u3044\u4f53\u9a13\u3092 Spring \u3067\u3082\u5b9f\u88c5\u3059\u308b\u4e8b\u304c\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308a\u3001\u3055\u3089\u306b <code>@ConditionalOnBean<\/code> \u306a\u3069\u306e\u6761\u4ef6\u4ed8\u304d\u306e bean \u306e\u767b\u9332\u306a\u3069\u3092 DSL \u3067\u78ba\u5b9f\u306b\u8a18\u8ff0\u3059\u308b\u4e8b\u304c\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<div class=\"code-block-container\">\n<pre class=\"language-kotlin\"><code class=\"language-kotlin code-line\" data-line=\"172\"><span class=\"token keyword\">class<\/span> MyBeanRegistrar <span class=\"token operator\">:<\/span> <span class=\"token function\">BeanRegistrarDsl<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">{<\/span>\n    registerBean<span class=\"token operator\">&lt;<\/span>Foo<span class=\"token operator\">&gt;<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span>\n    <span class=\"token function\">profile<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string-literal singleline\"><span class=\"token string\">\"baz\"<\/span><\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\n        registerBean <span class=\"token punctuation\">{<\/span> <span class=\"token function\">Baz<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string-literal singleline\"><span class=\"token string\">\"Hello World!\"<\/span><\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">}<\/span>\n    <span class=\"token punctuation\">}<\/span>\n    registerBean<span class=\"token operator\">&lt;<\/span>MyRepository<span class=\"token operator\">&gt;<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span>\n<\/code><\/pre>\n<\/div>\n<h2 id=\"%E3%81%BE%E3%81%A8%E3%82%81\" data-line=\"182\" class=\"code-line\">\n \u307e\u3068\u3081<\/h2>\n<p data-line=\"184\" class=\"code-line\">Spring Boot 4 \u3067\u3001\u3055\u3089\u306b Kotlin \u5bfe\u5fdc\u304c\u4fbf\u5229\u306b\u306a\u308a\u307e\u3057\u305f\u3002<\/p>\n<p data-line=\"186\" class=\"code-line\">Spring Boot \u306f\u3001Java \u306e\u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af\u3068\u601d\u308f\u308c\u304c\u3061\u3067\u3059\u304c\u3001\u8fd1\u5e74\u306f Kotlin \u3078\u306e\u5bfe\u5fdc\u3082\u304b\u306a\u308a\u9032\u3093\u3067\u3044\u3066\u3001Kotlin \u306e Web \u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af\u3068\u3057\u3066\u63a1\u7528\u3057\u3066\u3082\u554f\u984c\u306a\u3044\u72b6\u6cc1\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u3002\u524d\u8ff0\u306e\u3088\u3046\u306b JetBrains \u3068\u306e\u9023\u643a\u3082\u3042\u308a\u3001\u5c06\u6765\u6027\u3082\u671f\u5f85\u3067\u304d\u305d\u3046\u3067\u3059\u3002<\/p>\n<p data-line=\"188\" class=\"code-line\">Kotlin \u3092\u30d0\u30c3\u30af\u30a8\u30f3\u30c9\u306b\u63a1\u7528\u3059\u308b\u969b\u306e\u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af\u3068\u3057\u3066\u3001Java \u306e\u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af\u3067\u3042\u308b Spring \u306f\u907f\u3051\u3089\u308c\u304c\u3061\u3067\u3059\u304c\u3001\u305d\u3093\u306a\u3053\u3068\u306f\u3042\u308a\u307e\u305b\u3093\u3002Kotlin \u3067 Spring \u3092\u4f7f\u3063\u3066\u307f\u3066\u306f\u3044\u304b\u304c\u3067\u3057\u3087\u3046\u304b\u3002<\/p>\n<p data-line=\"190\" class=\"code-line\">\u6700\u5f8c\u306b\u3001KotlinConf 2025 \u3067\u3042\u3063\u305f Spring Boot 4 \u306b\u95a2\u9023\u3059\u308b\u30bb\u30c3\u30b7\u30e7\u30f3\u3092\u7d39\u4ecb\u3057\u3066\u7d42\u308f\u308a\u306b\u3057\u307e\u3059\u3002<\/p>\n<p data-line=\"192\" class=\"code-line\"><span class=\"embed-block zenn-embedded zenn-embedded-card\"><iframe id=\"zenn-embedded__ba663c6ee1ba6\" src=\"https:\/\/embed.zenn.studio\/card#zenn-embedded__ba663c6ee1ba6\" data-content=\"https%3A%2F%2F2025.kotlinconf.com%2Ftalks%2F795179%2F\" frameborder=\"0\" scrolling=\"no\" loading=\"lazy\"><\/iframe><\/span><a target=\"_blank\" href=\"https:\/\/2025.kotlinconf.com\/talks\/795179\/\" style=\"display:none\" target=\"_blank\" rel=\"nofollow noopener noreferrer\">https:\/\/2025.kotlinconf.com\/talks\/795179\/<\/a><\/p>\n<p data-line=\"194\" class=\"code-line\">\u660e\u65e5\u306e\u3001<a target=\"_blank\" href=\"https:\/\/adventar.org\/calendars\/11946\" target=\"_blank\" rel=\"nofollow noopener noreferrer\">Money Forward Engineers Advent Calendar 2025<\/a> \u306f Alex Wilson \u3055\u3093\u304c\u62c5\u5f53\u3057\u307e\u3059\uff01\u304a\u697d\u3057\u307f\u306b\u301c\ud83c\udf85\ud83c\udf84\ud83e\udd36<\/p>\n<\/div>\n\n<br \/><a href=\"https:\/\/zenn.dev\/moneyforward\/articles\/4922a97ab7c1d8\">\u5143\u306e\u8a18\u4e8b\u3092\u78ba\u8a8d\u3059\u308b <\/a><\/p>\n","protected":false},"excerpt":{"rendered":"! \u3053\u306e\u8a18\u4e8b\u306f\u3001Money Forward Engineers Advent Calendar 2025 12\u67083\u65e5\u306e\u6295\u7a3f\u3067\u3059 Spring Boot 4 \u3068 Spring Framework 7 \u304c2025\u5e7411\u6708\u306b\u30ea 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