{"id":40325,"date":"2023-09-22T16:18:55","date_gmt":"2023-07-11T17:54:15","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%a6%82%e6%9e%9c%e5%9c%a8kotlin-spring%e4%b8%ad%e6%b3%a8%e5%85%a5%e7%9a%84%e5%af%b9%e8%b1%a1%e5%b8%a6%e6%9c%89%e4%bb%a3%e7%90%86%ef%bc%88%e4%bd%bf%e7%94%a8cglib%ef%bc%89%ef%bc%8c%e5%b9%b6%e4%b8%94\/"},"modified":"2024-05-04T01:03:37","modified_gmt":"2024-05-03T17:03:37","slug":"%e5%a6%82%e6%9e%9c%e5%9c%a8kotlin-spring%e4%b8%ad%e6%b3%a8%e5%85%a5%e7%9a%84%e5%af%b9%e8%b1%a1%e5%b8%a6%e6%9c%89%e4%bb%a3%e7%90%86%ef%bc%88%e4%bd%bf%e7%94%a8cglib%ef%bc%89%ef%bc%8c%e5%b9%b6%e4%b8%94","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%a6%82%e6%9e%9c%e5%9c%a8kotlin-spring%e4%b8%ad%e6%b3%a8%e5%85%a5%e7%9a%84%e5%af%b9%e8%b1%a1%e5%b8%a6%e6%9c%89%e4%bb%a3%e7%90%86%ef%bc%88%e4%bd%bf%e7%94%a8cglib%ef%bc%89%ef%bc%8c%e5%b9%b6%e4%b8%94\/","title":{"rendered":"\u5982\u679c\u5728Kotlin + Spring\u4e2d\u6ce8\u5165\u7684\u5bf9\u8c61\u5e26\u6709\u4ee3\u7406\uff08\u4f7f\u7528CGLib\uff09\uff0c\u5e76\u4e14\u65b9\u6cd5\u4f7f\u7528\u79c1\u6709\u53d8\u91cf\u4f5c\u4e3a\u9ed8\u8ba4\u975e\u7a7a\u53c2\u6570\uff0c\u90a3\u4e48\u5b83\u4f1a\u5bfc\u81f4\u6b7b\u673a"},"content":{"rendered":"<p>\u6309\u7167\u6807\u9898\u6240\u8bf4\u3002<\/p>\n<p>\u5f53\u7b26\u5408\u6761\u4ef6\u65f6\uff0cKotlin + Spring\u7684\u4ee3\u7801\u53ef\u80fd\u4f1a\u8868\u9762\u4e0a\u770b\u8d77\u6765\u5f88\u6b63\u786e\uff0c\u4f46\u5374\u4f1a\u5bfc\u81f4\u51fa\u9519\u3002<\/p>\n<h2>\u518d\u73fe\u4ee3\u7801<\/h2>\n<p>\u518d\u73b0\u4ee3\u7801\u5728\u4e0b\u65b9\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"nv\">$ <\/span>git clone https:\/\/github.com\/knjname\/2019-05-22_springkotlinpitfall 2019-05-22_springkotlinpitfall\r\n<span class=\"nv\">$ <\/span><span class=\"nb\">cd<\/span> <span class=\"o\">!<\/span><span class=\"err\">$<\/span>\r\n<span class=\"nv\">$ <\/span>.\/gradlew bootRun\r\n\r\n...\r\njava.lang.IllegalStateException: Failed to execute CommandLineRunner\r\n        at org.springframework.boot.SpringApplication.callRunner<span class=\"o\">(<\/span>SpringApplication.java:816<span class=\"o\">)<\/span> ~[spring-boot-2.1.5.RELEASE.jar:2.1.5.RELEASE]\r\n        at org.springframework.boot.SpringApplication.callRunners<span class=\"o\">(<\/span>SpringApplication.java:797<span class=\"o\">)<\/span> ~[spring-boot-2.1.5.RELEASE.jar:2.1.5.RELEASE]\r\n        at org.springframework.boot.SpringApplication.run<span class=\"o\">(<\/span>SpringApplication.java:324<span class=\"o\">)<\/span> ~[spring-boot-2.1.5.RELEASE.jar:2.1.5.RELEASE]\r\n        at org.springframework.boot.SpringApplication.run<span class=\"o\">(<\/span>SpringApplication.java:1260<span class=\"o\">)<\/span> ~[spring-boot-2.1.5.RELEASE.jar:2.1.5.RELEASE]\r\n        at org.springframework.boot.SpringApplication.run<span class=\"o\">(<\/span>SpringApplication.java:1248<span class=\"o\">)<\/span> ~[spring-boot-2.1.5.RELEASE.jar:2.1.5.RELEASE]\r\n        at knjname.springkotlinpitfall.SpringkotlinpitfallApplicationKt.main<span class=\"o\">(<\/span>SpringkotlinpitfallApplication.kt:41<span class=\"o\">)<\/span> ~[main\/:na]\r\nCaused by: java.lang.IllegalArgumentException: Parameter specified as non-null is null: method knjname.springkotlinpitfall.Nuke.withOptional, parameter lst\r\n        at knjname.springkotlinpitfall.Nuke.withOptional<span class=\"o\">(<\/span>SpringkotlinpitfallApplication.kt<span class=\"o\">)<\/span> ~[main\/:na]\r\n        at knjname.springkotlinpitfall.Nuke<span class=\"nv\">$$<\/span>FastClassBySpringCGLIB<span class=\"nv\">$$<\/span>13faa123.invoke<span class=\"o\">(<\/span>&lt;generated&gt;<span class=\"o\">)<\/span> ~[main\/:na]\r\n...\r\n\r\n<\/code><\/pre>\n<h2>\u89e3\u91ca<\/h2>\n<p>\u4ee5\u4e0b\u662f\u80fd\u591f\u91cd\u73b0\u95ee\u9898\u7684\u4ee3\u7801\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">package<\/span> <span class=\"nn\">knjname.springkotlinpitfall<\/span>\r\n\r\n<span class=\"k\">import<\/span> <span class=\"nn\">org.springframework.boot.CommandLineRunner<\/span>\r\n<span class=\"k\">import<\/span> <span class=\"nn\">org.springframework.boot.autoconfigure.SpringBootApplication<\/span>\r\n<span class=\"k\">import<\/span> <span class=\"nn\">org.springframework.boot.runApplication<\/span>\r\n<span class=\"k\">import<\/span> <span class=\"nn\">org.springframework.stereotype.Component<\/span>\r\n<span class=\"k\">import<\/span> <span class=\"nn\">org.springframework.transaction.annotation.Transactional<\/span>\r\n\r\n<span class=\"nd\">@Component<\/span>\r\n<span class=\"nd\">@SpringBootApplication<\/span>\r\n<span class=\"kd\">class<\/span> <span class=\"nc\">SpringkotlinpitfallApplication<\/span><span class=\"p\">(<\/span>\r\n        <span class=\"k\">private<\/span> <span class=\"kd\">val<\/span> <span class=\"py\">nuke<\/span><span class=\"p\">:<\/span> <span class=\"nc\">Nuke<\/span>\r\n<span class=\"p\">)<\/span> <span class=\"p\">:<\/span> <span class=\"nc\">CommandLineRunner<\/span> <span class=\"p\">{<\/span>\r\n\r\n    <span class=\"k\">override<\/span> <span class=\"k\">fun<\/span> <span class=\"nf\">run<\/span><span class=\"p\">(<\/span><span class=\"k\">vararg<\/span> <span class=\"n\">args<\/span><span class=\"p\">:<\/span> <span class=\"nc\">String<\/span><span class=\"p\">?)<\/span> <span class=\"p\">{<\/span>\r\n        <span class=\"c1\">\/\/ \u3053\u3053\u304b\u3089\u8d77\u52d5\u3057\u307e\u3059<\/span>\r\n        <span class=\"n\">nuke<\/span><span class=\"p\">.<\/span><span class=\"nf\">withOptional<\/span><span class=\"p\">()<\/span>\r\n    <span class=\"p\">}<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<span class=\"nd\">@Component<\/span>\r\n<span class=\"kd\">class<\/span> <span class=\"nc\">Nuke<\/span> <span class=\"p\">{<\/span>\r\n\r\n    <span class=\"k\">private<\/span> <span class=\"kd\">val<\/span> <span class=\"py\">a<\/span> <span class=\"p\">=<\/span> <span class=\"nf\">listOf<\/span><span class=\"p\">(<\/span><span class=\"s\">\"a\"<\/span><span class=\"p\">)<\/span>\r\n\r\n    <span class=\"c1\">\/\/ \u3053\u3053\u3067\u6b7b\u306c\uff01\uff01<\/span>\r\n    <span class=\"c1\">\/\/ Caused by: java.lang.IllegalArgumentException: Parameter specified as non-null is null:<\/span>\r\n    <span class=\"c1\">\/\/ method knjname.springkotlinpitfall.Nuke.withOptional, parameter lst<\/span>\r\n    <span class=\"k\">fun<\/span> <span class=\"nf\">withOptional<\/span><span class=\"p\">(<\/span>\r\n            <span class=\"n\">lst<\/span><span class=\"p\">:<\/span> <span class=\"nc\">List<\/span><span class=\"p\">&lt;<\/span><span class=\"nc\">Any<\/span><span class=\"p\">&gt;<\/span> <span class=\"p\">=<\/span> <span class=\"n\">a<\/span>\r\n    <span class=\"p\">)<\/span> <span class=\"p\">=<\/span> <span class=\"nc\">Unit<\/span>\r\n\r\n    <span class=\"nd\">@Transactional<\/span>\r\n    <span class=\"k\">fun<\/span> <span class=\"nf\">xxx<\/span><span class=\"p\">()<\/span> <span class=\"p\">=<\/span> <span class=\"nc\">Unit<\/span>\r\n\r\n<span class=\"p\">}<\/span>\r\n\r\n\r\n<span class=\"k\">fun<\/span> <span class=\"nf\">main<\/span><span class=\"p\">(<\/span><span class=\"n\">args<\/span><span class=\"p\">:<\/span> <span class=\"nc\">Array<\/span><span class=\"p\">&lt;<\/span><span class=\"nc\">String<\/span><span class=\"p\">&gt;)<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"n\">runApplication<\/span><span class=\"p\">&lt;<\/span><span class=\"nc\">SpringkotlinpitfallApplication<\/span><span class=\"p\">&gt;(*<\/span><span class=\"n\">args<\/span><span class=\"p\">)<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<\/code><\/pre>\n<p>\u5f53\u6267\u884c\u4e0a\u8ff0\u64cd\u4f5c\u65f6\uff0c\u5728\u8c03\u7528withOptional\u65b9\u6cd5\u65f6\uff0c\u4f1a\u89e6\u53d1Kotlin\u7684\u7a7a\u503c\u68c0\u67e5\u5e76\u5bfc\u81f4\u5f02\u5e38\uff0c\u7a0b\u5e8f\u56e0\u6b64\u5d29\u6e83\u3002<\/p>\n<p>\u7531\u4e8e\u4e0b\u5217\u6761\u4ef6\u6ee1\u8db3\u3002<\/p>\n<p>@Transactional \u3092\u6301\u3064\u3053\u3068\u306b\u3088\u308a\u3001 Nuke \u30af\u30e9\u30b9\u306fCGLib\u3067\u30e9\u30c3\u30d7\u3055\u308c\u308b\u3053\u3068\u3068\u306a\u308b\u3002<\/p>\n<p>Spring\u3067\u6ce8\u5165\u3055\u308c\u305f Nuke \u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u306f\u5168\u3066CGLib\u306e\u30d7\u30ed\u30ad\u30b7\u30af\u30e9\u30b9\u306b\u306a\u308b\u3002<br \/>\nCGLib \u3067\u30e9\u30c3\u30d7\u3055\u308c\u305f\u30af\u30e9\u30b9\u306e\u30d5\u30a3\u30fc\u30eb\u30c9\u5909\u6570\u306f null \u3068\u306a\u308b\u3002<\/p>\n<p>Kotlin\u304c\u30c7\u30d5\u30a9\u30eb\u30c8\u5f15\u6570\u3064\u304d\u306e\u30e1\u30bd\u30c3\u30c9\u3092\u547c\u3076\u969b\u306f Nuke \u30af\u30e9\u30b9\u306b\u30d8\u30eb\u30d1\u7528\u306e static \u30e1\u30bd\u30c3\u30c9 (withOptional$default) \u3092\u751f\u6210\u3057\u3001\u305d\u306e\u30e1\u30bd\u30c3\u30c9\u306b Nuke\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\uff08\u4eca\u56de\u306fCGLib\u306b\u30e9\u30c3\u30d1\u3055\u308c\u305f\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\uff09 \u3092\u5f15\u6570\u3068\u3057\u3066\u6e21\u3057\u3066\u547c\u3073\u51fa\u3059\u3002<br \/>\n\u8a72\u5f53\u306estatic\u30e1\u30bd\u30c3\u30c9\u306f Nuke.a \u3092\u30c7\u30d5\u30a9\u30eb\u30c8\u5f15\u6570\u306e\u5024\u3068\u3059\u308b\u305f\u3081\u53c2\u7167\u3059\u308b\u304c\u3001CGLib\u306b\u30e9\u30c3\u30d7\u3055\u308c\u305f\u30af\u30e9\u30b9\u306e\u30d5\u30a3\u30fc\u30eb\u30c9\u3067\u3042\u308b\u305f\u3081\u3001\u4e0a\u8ff0\u306e\u901a\u308a\u3001null \u5024\u304c\u5165\u308b\u3002<\/p>\n<p>\u3064\u307e\u308a\u3001 listOf(&#8220;a&#8221;) \u306f\u4f7f\u308f\u308c\u306a\u3044\u3002<\/p>\n<p>null \u5024\u304cKotlin\u306e\u30e9\u30f3\u30bf\u30a4\u30e0\u6642\u306e withOptional \u30e1\u30bd\u30c3\u30c9\u5185\u306enull\u30c1\u30a7\u30c3\u30af\u306b\u3088\u3063\u3066\u30c1\u30a7\u30c3\u30af\u3055\u308c\u3001\u4f8b\u5916\u304c\u767a\u751f\u3059\u308b\u3002<\/p>\n<p>\u7ecf\u5386\u4e86\u5982\u4e0a\u6240\u8ff0\u7684\u590d\u6742\u60c5\u51b5\u540e\uff0c\u6211\u4f1a\u6b7b\u53bb\u3002\u9ed8\u8ba4\u53c2\u6570\u592a\u53ef\u6015\u4e86\uff01<\/p>\n<h2>\u7ed5\u8fc7\u8fd9\u4e2a\u95ee\u9898<\/h2>\n<p>\u5982\u679c\u4e0d\u7b26\u5408\u4e0a\u8ff0\u6761\u4ef6\uff0c\u5219\u53ef\u4ee5\u56de\u907f\uff0c\u53ef\u4ee5\u91c7\u53d6\u4ee5\u4e0b\u56de\u907f\u65b9\u6cd5\u3002<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u30c7\u30d5\u30a9\u30eb\u30c8\u5f15\u6570\u306b\u6307\u5b9a\u3059\u308b\u5b9a\u6570\u3092<\/ul>\n<\/li>\n<\/ul>\n<p>private val \u3067\u306f\u306a\u304f val \u3092\u7528\u3044\u308b<br \/>\n\u30af\u30e9\u30b9\u5185\u306b\u5ba3\u8a00\u3057\u306a\u3044<br \/>\nclass \u306e\u5916\u306b\u5ba3\u8a00\u3059\u308b<br \/>\n\u30b3\u30f3\u30d1\u30cb\u30aa\u30f3\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u5ba3\u8a00\u3059\u308b<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6309\u7167\u6807\u9898\u6240\u8bf4\u3002 \u5f53\u7b26\u5408\u6761\u4ef6\u65f6\uff0cKotlin + Spring\u7684\u4ee3\u7801\u53ef\u80fd\u4f1a\u8868\u9762\u4e0a\u770b\u8d77\u6765\u5f88\u6b63\u786e\uff0c\u4f46\u5374\u4f1a\u5bfc\u81f4\u51fa\u9519\u3002  [&hellip;]<\/p>\n","protected":false},"author":7,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-40325","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>\u5982\u679c\u5728Kotlin + Spring\u4e2d\u6ce8\u5165\u7684\u5bf9\u8c61\u5e26\u6709\u4ee3\u7406\uff08\u4f7f\u7528CGLib\uff09\uff0c\u5e76\u4e14\u65b9\u6cd5\u4f7f\u7528\u79c1\u6709\u53d8\u91cf\u4f5c\u4e3a\u9ed8\u8ba4\u975e\u7a7a\u53c2\u6570\uff0c\u90a3\u4e48\u5b83\u4f1a\u5bfc\u81f4\u6b7b\u673a - Blog - Silicon Cloud<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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