{"id":1088,"date":"2025-03-17T17:17:41","date_gmt":"2025-03-17T08:17:41","guid":{"rendered":"https:\/\/route-zero.com\/recruit\/route\/1088\/"},"modified":"2025-03-17T17:58:41","modified_gmt":"2025-03-17T08:58:41","slug":"1088","status":"publish","type":"route","link":"https:\/\/route-zero.com\/recruit\/route\/1088\/","title":{"rendered":"Spring Boot\u30a2\u30d7\u30ea\u958b\u767a\u3067\u983b\u767a\u3059\u308bWhitelabel Error Page\uff5cThymeleaf\u306e\u30c6\u30f3\u30d7\u30ec\u30fc\u30c8\u30a8\u30e9\u30fc\u3068\u5bfe\u7b56\u307e\u3068\u3081"},"content":{"rendered":"
\n

\u306f\u3058\u3081\u306b<\/h2>\n

Spring Boot\u3092\u4f7f\u7528\u3057\u3066Web\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3092\u958b\u767a\u3059\u308b\u969b\u3001\u300cWhitelabel Error Page\u300d<\/strong> \u306b\u906d\u9047\u3057\u305f\u3053\u3068\u304c\u3042\u308b\u65b9\u3082\u591a\u3044\u306e\u3067\u306f\u306a\u3044\u3067\u3057\u3087\u3046\u304b\uff1f \u3053\u306e\u30a8\u30e9\u30fc\u30da\u30fc\u30b8\u306f\u3001Spring Boot\u306e\u30c7\u30d5\u30a9\u30eb\u30c8\u306e\u30a8\u30e9\u30fc\u30da\u30fc\u30b8\u3067\u3042\u308a\u3001\u4e3b\u306b\u30d3\u30e5\u30fc\u306e\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u306b\u5931\u6557\u3057\u305f\u969b\u3084\u3001\u4f8b\u5916\u304c\u9069\u5207\u306b\u51e6\u7406\u3055\u308c\u306a\u304b\u3063\u305f\u5834\u5408\u306b\u8868\u793a\u3055\u308c\u307e\u3059\u3002<\/p>\n

\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001\u7279\u306b Thymeleaf<\/strong> \u3092\u4f7f\u7528\u3057\u3066\u3044\u308b\u969b\u306b\u767a\u751f\u3059\u308b\u300cWhitelabel Error Page\u300d\u306e\u539f\u56e0\u3068\u3001\u305d\u306e\u5bfe\u51e6\u6cd5\u306b\u3064\u3044\u3066\u8a73\u3057\u304f\u89e3\u8aac\u3057\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n

\n

2. Whitelabel Error Page\u3068\u306f\uff1f<\/h2>\n

2.1 \u30a8\u30e9\u30fc\u306e\u6982\u8981<\/h3>\n

Spring Boot\u3067\u306f\u3001\u30c7\u30d5\u30a9\u30eb\u30c8\u3067\u300cWhitelabel Error Page\u300d\u3068\u547c\u3070\u308c\u308b\u30a8\u30e9\u30fc\u30da\u30fc\u30b8\u304c\u63d0\u4f9b\u3055\u308c\u3066\u304a\u308a\u3001 \u30d3\u30e5\u30fc\u306e\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u306b\u5931\u6557\u3057\u305f\u5834\u5408\u306a\u3069\u306b\u8868\u793a\u3055\u308c\u307e\u3059\u3002<\/p>\n

\u4f8b\u3048\u3070\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u30da\u30fc\u30b8\u3092\u898b\u305f\u3053\u3068\u304c\u3042\u308b\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u3002<\/p>\n

Whitelabel Error<\/span> Page\r\nThis application has no explicit mapping for<\/span> \/error, so you are seeing this<\/span> as<\/span> a fallback.\r\nThere was an unexpected error (type<\/span>=Internal Server Error<\/span>, status=500<\/span>).<\/code><\/pre>\n
\u3053\u306e\u30a8\u30e9\u30fc\u30da\u30fc\u30b8\u304c\u8868\u793a\u3055\u308c\u308b\u4e3b\u306a\u539f\u56e0\u3068\u3057\u3066\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u30b1\u30fc\u30b9\u304c\u6319\u3052\u3089\u308c\u307e\u3059\u3002<\/p>\n
    \n
  • \n
    Thymeleaf\u306e\u30c6\u30f3\u30d7\u30ec\u30fc\u30c8\u304c\u898b\u3064\u304b\u3089\u306a\u3044<\/strong><\/p>\n<\/li>\n
  • \n
    Thymeleaf\u306e\u69cb\u6587\u30a8\u30e9\u30fc<\/strong><\/p>\n<\/li>\n
  • \n
    Controller\u306e\u8a2d\u5b9a\u30df\u30b9<\/strong><\/p>\n<\/li>\n
  • \n
    \u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u5185\u90e8\u3067\u4f8b\u5916\u304c\u767a\u751f\u3057\u3066\u3044\u308b<\/strong><\/p>\n<\/li>\n<\/ul>\n
    \n
    3. \u3088\u304f\u3042\u308b\u539f\u56e0\u3068\u89e3\u6c7a\u7b56<\/h2>\n
    3.1 Thymeleaf\u306e\u30c6\u30f3\u30d7\u30ec\u30fc\u30c8\u304c\u898b\u3064\u304b\u3089\u306a\u3044<\/h3>\n
    \u539f\u56e0<\/strong>: src\/main\/resources\/templates\/ \u914d\u4e0b\u306b\u5bfe\u5fdc\u3059\u308bHTML\u30d5\u30a1\u30a4\u30eb\u304c\u5b58\u5728\u3057\u306a\u3044\u3002<\/p>\n
    \u89e3\u6c7a\u7b56<\/strong><\/p>\n
      \n
    1. \n
      src\/main\/resources\/templates\/ \u914d\u4e0b\u306b\u30c6\u30f3\u30d7\u30ec\u30fc\u30c8\u30d5\u30a1\u30a4\u30eb\u304c\u3042\u308b\u304b\u78ba\u8a8d\u3059\u308b\u3002<\/p>\n<\/li>\n
    2. \n
      Controller\u306e@GetMapping\u3067\u6307\u5b9a\u3057\u3066\u3044\u308b\u30c6\u30f3\u30d7\u30ec\u30fc\u30c8\u540d\u3068\u3001\u5b9f\u969b\u306e\u30d5\u30a1\u30a4\u30eb\u540d\u304c\u4e00\u81f4\u3057\u3066\u3044\u308b\u304b\u30c1\u30a7\u30c3\u30af\u3059\u308b\u3002<\/p>\n<\/li>\n<\/ol>\n
      @Controller<\/span>\r\npublic<\/span> class<\/span> HomeController<\/span> <\/span>{\r\n    @GetMapping<\/span>(\"\/home\"<\/span>)\r\n    public<\/span> String home<\/span>()<\/span> <\/span>{\r\n        return<\/span> \"home\"<\/span>;  \/\/ home.html\u304c templates\/ \u306b\u5b58\u5728\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b<\/span>\r\n    }\r\n}<\/code><\/pre>\n
      3.2 Thymeleaf\u306e\u69cb\u6587\u30a8\u30e9\u30fc<\/h3>\n
      \u539f\u56e0<\/strong>: th:text \u3084 th:each \u306a\u3069\u306e\u5c5e\u6027\u306e\u8a18\u8ff0\u30df\u30b9<\/p>\n
      \u89e3\u6c7a\u7b56<\/strong><\/p>\n
        \n
      1. \n
        Thymeleaf\u306e\u516c\u5f0f\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8<\/strong>\u3092\u53c2\u7167\u3057\u306a\u304c\u3089\u6b63\u3057\u3044\u69cb\u6587\u3092\u78ba\u8a8d\u3059\u308b\u3002<\/p>\n<\/li>\n
      2. \n
        Java\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30d7\u30ed\u30d1\u30c6\u30a3\u540d\u3068Thymeleaf\u3067\u53c2\u7167\u3059\u308b\u5909\u6570\u540d\u304c\u4e00\u81f4\u3057\u3066\u3044\u308b\u304b\u78ba\u8a8d\u3059\u308b\u3002<\/p>\n<\/li>\n
      3. \n
        \u30a8\u30e9\u30fc\u306e\u7279\u5b9a\u304c\u56f0\u96e3\u306a\u5834\u5408<\/strong>:\u300cth:\u300d\u3067\u59cb\u307e\u308b\u5c5e\u6027\u3092\u4e00\u6642\u7684\u306b\u30b3\u30e1\u30f3\u30c8\u30a2\u30a6\u30c8\u3057\u3001Whitelabel Error Page\u306e\u8868\u793a\u304c\u5909\u5316\u3059\u308b\u304b\u3092\u78ba\u8a8d\u3059\u308b\u3002<\/p>\n<\/li>\n<\/ol>\n
        \u4f8b: NG\u30b3\u30fc\u30c9<\/strong><\/p>\n
        <p th:text=\"${user.getName()}\"<\/span>><\/p>  <!-- getName()\u306f\u4e0d\u8981 --><\/code><\/pre>\n
        \u4fee\u6b63\u5f8c: OK\u30b3\u30fc\u30c9<\/strong><\/p>\n
        <p th:text=\"${user.name}\"<\/span>><\/p><\/code><\/pre>\n
        \u30a8\u30e9\u30fc\u306e\u7279\u5b9a\u65b9\u6cd5<\/strong>:<\/p>\n
        <!-- <p th:<\/span>text=\"${user.name}\"<\/span>><\/p> --><\/span><\/code><\/pre>\n
        \u3053\u306e\u3088\u3046\u306b th: \u3092\u542b\u3080\u30b3\u30fc\u30c9\u3092\u30b3\u30e1\u30f3\u30c8\u30a2\u30a6\u30c8\u3057\u3001Whitelabel Error Page\u304c\u8868\u793a\u3055\u308c\u306a\u304f\u306a\u308c\u3070\u3001\u305d\u306e\u90e8\u5206\u304c\u30a8\u30e9\u30fc\u306e\u539f\u56e0\u3067\u3042\u308b\u53ef\u80fd\u6027\u304c\u9ad8\u3044\u3067\u3059\u3002<\/p>\n
        3.3 Controller\u306e\u8a2d\u5b9a\u30df\u30b9<\/h3>\n
        \u539f\u56e0<\/strong>: @RequestMapping \u306a\u3069\u306e\u8a2d\u5b9a\u304c\u9593\u9055\u3063\u3066\u3044\u308b\u3002<\/p>\n
        \u89e3\u6c7a\u7b56<\/strong>:<\/p>\n
          \n
        1. \n
          @Controller \u307e\u305f\u306f @RestController \u306e\u6307\u5b9a\u3092\u78ba\u8a8d\u3059\u308b\u3002<\/p>\n<\/li>\n
        2. \n
          @GetMapping \u3084 @RequestMapping \u306e\u30d1\u30b9\u304c\u6b63\u3057\u3044\u304b\u30c1\u30a7\u30c3\u30af\u3059\u308b\u3002<\/p>\n<\/li>\n<\/ol>\n
          @Controller<\/span>\r\npublic<\/span> class<\/span> UserController<\/span> <\/span>{\r\n    @GetMapping<\/span>(\"\/user\"<\/span>)\r\n    public<\/span> String getUserPage<\/span>(Model model)<\/span> <\/span>{\r\n        model.addAttribute(\"user\"<\/span>, new<\/span> User(\"John Doe\"<\/span>));\r\n        return<\/span> \"user\"<\/span>;  \/\/ user.html\u304c templates\/ \u306b\u5fc5\u8981<\/span>\r\n    }\r\n}<\/code><\/pre>\n
          3.4 \u4f8b\u5916\u304c\u9069\u5207\u306b\u51e6\u7406\u3055\u308c\u3066\u3044\u306a\u3044<\/h3>\n
          \u539f\u56e0<\/strong>: Controller\u5185\u3067\u51e6\u7406\u3055\u308c\u306a\u3044\u4f8b\u5916\u304c\u767a\u751f\u3057\u3066\u3044\u308b\u3002<\/p>\n
          \u89e3\u6c7a\u7b56<\/strong><\/p>\n
            \n
          1. \n
            @ExceptionHandler \u3092\u4f7f\u3063\u3066\u4f8b\u5916\u51e6\u7406\u3092\u884c\u3046\u3002<\/p>\n<\/li>\n
          2. \n
            ErrorController \u3092\u4f5c\u6210\u3057\u3001\u30ab\u30b9\u30bf\u30e0\u30a8\u30e9\u30fc\u30da\u30fc\u30b8\u3092\u8868\u793a\u3059\u308b\u3088\u3046\u306b\u3059\u308b\u3002<\/p>\n<\/li>\n<\/ol>\n
            @ControllerAdvice<\/span>\r\npublic<\/span> class<\/span> GlobalExceptionHandler<\/span> <\/span>{\r\n    @ExceptionHandler<\/span>(Exception.class)\r\n    public<\/span> String handleException<\/span>(Exception e, Model model)<\/span> <\/span>{\r\n        model.addAttribute(\"message\"<\/span>, e.getMessage());\r\n        return<\/span> \"error\"<\/span>;  \/\/ error.html\u3092\u4f5c\u6210\u3059\u308b<\/span>\r\n    }\r\n}<\/code><\/pre>\n
            \n
            4. \u30ab\u30b9\u30bf\u30e0\u30a8\u30e9\u30fc\u30da\u30fc\u30b8\u3092\u8a2d\u5b9a\u3059\u308b<\/h2>\n
            \u30c7\u30d5\u30a9\u30eb\u30c8\u306e\u300cWhitelabel Error Page\u300d\u3092\u907f\u3051\u308b\u305f\u3081\u306b\u3001\u30ab\u30b9\u30bf\u30e0\u30a8\u30e9\u30fc\u30da\u30fc\u30b8\u3092\u4f5c\u6210\u3059\u308b\u65b9\u6cd5\u3092\u7d39\u4ecb\u3057\u307e\u3059\u3002<\/p>\n
            4.1 src\/main\/resources\/templates\/error.html \u3092\u4f5c\u6210\u3059\u308b<\/h3>\n
            <!DOCTYPE html>\r\n<html xmlns:th=\"http:\/\/www.thymeleaf.org\"<\/span>>\r\n<head>\r\n    <title>Error<\/title>\r\n<\/head>\r\n<body>\r\n    <h1>\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3057\u307e\u3057\u305f<\/h1>\r\n    <p th:text=\"${message}\"<\/span>><\/p>\r\n<\/body>\r\n<\/html><\/code><\/pre>\n
            4.2 ErrorController \u3092\u4f5c\u6210\u3059\u308b<\/h3>\n
            @Controller<\/span>\r\npublic<\/span> class<\/span> CustomErrorController<\/span> implements<\/span> ErrorController<\/span> <\/span>{\r\n\r\n    @RequestMapping<\/span>(\"\/error\"<\/span>)\r\n    public<\/span> String handleError<\/span>(Model model)<\/span> <\/span>{\r\n        model.addAttribute(\"message\"<\/span>, \"\u30da\u30fc\u30b8\u304c\u898b\u3064\u304b\u308a\u307e\u305b\u3093\u3002\"<\/span>);\r\n        return<\/span> \"error\"<\/span>;\r\n    }\r\n}<\/code><\/pre>\n
            \n
            5. \u307e\u3068\u3081<\/h2>\n
            Thymeleaf\u3092\u4f7f\u7528\u3057\u305fSpring Boot\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3067\u300cWhitelabel Error Page\u300d\u304c\u8868\u793a\u3055\u308c\u308b\u5834\u5408\u3001<\/p>\n