{"id":708,"date":"2024-01-13T00:50:45","date_gmt":"2024-01-12T15:50:45","guid":{"rendered":"https:\/\/hirabay.net\/?p=708"},"modified":"2024-01-15T17:22:38","modified_gmt":"2024-01-15T08:22:38","slug":"%e3%80%90springboot%e3%80%91%e4%b8%a6%e5%88%97%e3%83%bb%e9%9d%9e%e5%90%8c%e6%9c%9f%e5%87%a6%e7%90%86%e3%81%ae%e5%ae%9f%e8%a3%85%e6%96%b9%e6%b3%95","status":"publish","type":"post","link":"https:\/\/hirabay.net\/?p=708","title":{"rendered":"\u3010SpringBoot\u3011\u4e26\u5217\u30fb\u975e\u540c\u671f\u51e6\u7406\u306e\u5b9f\u88c5\u65b9\u6cd5"},"content":{"rendered":"\n<p>SpringBoot\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3067\u306e\u4e26\u5217\u51e6\u7406\u30fb\u975e\u540c\u671f\u51e6\u7406\u306b\u3064\u3044\u3066\u3001\u5b9f\u88c5\u65b9\u6cd5\u3092\u3054\u7d39\u4ecb\u3057\u307e\u3059\uff01<\/p>\n\n\n\n<p>\u4e26\u5217\u51e6\u7406\u30fb\u975e\u540c\u671f\u51e6\u7406\u3092\u5b9f\u88c5\u3059\u308b\u3068\u3001\u8907\u6570\u306e\u51e6\u7406\u3092\u3044\u3063\u307a\u3093\u306b\u5b9f\u884c\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u306e\u3067\u5168\u4f53\u306e\u51e6\u7406\u901f\u5ea6\u306e\u5411\u4e0a\u304c\u898b\u8fbc\u3081\u307e\u3059\uff01<\/p>\n\n\n\n<div class=\"wp-block-sgb-say\"><div class=\"sgb-block-say sgb-block-say--left\"><div class=\"sgb-block-say-avatar\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/hirabay.net\/wp-content\/uploads\/2023\/01\/c90be45c419f1b74db0f1d5a262d000d.png\" alt=\"\u3072\u3089\u3079\u30fc\" width=\"80\" height=\"80\" style=\"border-color:#eaedf2\"><div class=\"sgb-block-say-avatar__name\">\u3072\u3089\u3079\u30fc<\/div><\/div><div class=\"sgb-block-say-text\"><div class=\"sgb-block-say-text__content\" style=\"color:#333;border-color:#d5d5d5;background-color:#FFF\">\n<p><span class=\"keiko_yellow\"><strong>\u3053\u3093\u306a\u30b1\u30fc\u30b9\u3067\u306f\u30aa\u30b9\u30b9\u30e1\uff01<\/strong><\/span><\/p>\n\n\n\n<p>\u30fb\u4f9d\u5b58\u3057\u5408\u308f\u306a\u3044\u51e6\u7406\u304c\u76f4\u5217\u5b9f\u884c\u3055\u308c\u3066\u3044\u308b<\/p>\n\n\n\n<p>\u30fbIO\u306b\u6642\u9593\u304c\u304b\u304b\u308b<\/p>\n<span class=\"sgb-block-say-text__before\" style=\"border-right-color:#d5d5d5\"><\/span><span class=\"sgb-block-say-text__after\" style=\"border-right-color:#FFF\"><\/span><\/div><\/div><\/div><\/div>\n\n\n\n<p>\u4e00\u65b9\u3001\u76f4\u5217\u51e6\u7406\u306b\u6bd4\u3079\u308b\u3068\u5b9f\u88c5\u306b\u7656\u304c\u3042\u3063\u305f\u308a\u3001\u53ef\u8aad\u6027\u304c\u4e0b\u304c\u308b\u30c7\u30e1\u30ea\u30c3\u30c8\u306f\u3042\u308b\u306e\u3067\u3001\u6ce8\u610f\u3082\u5fc5\u8981\u3067\u3059\u3002<\/p>\n\n\n\n<div class=\"wp-block-sgb-say\"><div class=\"sgb-block-say sgb-block-say--left\"><div class=\"sgb-block-say-avatar\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/hirabay.net\/wp-content\/uploads\/2023\/01\/8587387ec297d96871b842816a3e545b.png\" alt=\"\u3072\u3089\u3079\u30fc\" width=\"80\" height=\"80\" style=\"border-color:#eaedf2\"><div class=\"sgb-block-say-avatar__name\">\u3072\u3089\u3079\u30fc<\/div><\/div><div class=\"sgb-block-say-text\"><div class=\"sgb-block-say-text__content\" style=\"color:#333;border-color:#d5d5d5;background-color:#FFF\">\n<p><strong><span class=\"keiko_blue\">\u3053\u3093\u306a\u30b1\u30fc\u30b9\u3067\u306f\u30a4\u30de\u30a4\u30c1\u304b\u3082\u2026<\/span><\/strong><\/p>\n\n\n\n<p>\u30fb\u30c1\u30fc\u30e0\u306e\u958b\u767a\u30b9\u30ad\u30eb\u304c\u6210\u719f\u3057\u3066\u3044\u306a\u3044<\/p>\n\n\n\n<p>\u30fb\u51e6\u7406\u304c\u8efd\u304f\u4e26\u5217\u3067\u51e6\u7406\u3057\u3066\u3082\u51e6\u7406\u901f\u5ea6\u304c\u305d\u308c\u307b\u3069\u5909\u308f\u3089\u306a\u3044<\/p>\n\n\n\n<p>\u30fbCPU\u3084\u30e1\u30e2\u30ea\u3092\u591a\u304f\u4f7f\u7528\u3059\u308b\uff08\u4e26\u5217\u51e6\u7406\u3059\u308b\u3068\u30ea\u30bd\u30fc\u30b9\u304c\u903c\u8feb\u3059\u308b\uff09<\/p>\n<span class=\"sgb-block-say-text__before\" style=\"border-right-color:#d5d5d5\"><\/span><span class=\"sgb-block-say-text__after\" style=\"border-right-color:#FFF\"><\/span><\/div><\/div><\/div><\/div>\n\n\n\n<p>\u3056\u3063\u304f\u308a\u3068\u30e1\u30ea\u30c7\u30e1\u3092\u628a\u63e1\u3044\u305f\u3060\u3044\u305f\u3068\u3053\u308d\u3067\u3001\u5177\u4f53\u7684\u306b\u307f\u3066\u3044\u304d\u307e\u3057\u3087\u3046\uff01<\/p>\n\n\n\n<p>\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001\u5b9f\u88c5\u65b9\u6cd5\u3092\u7db2\u7f85\u7684\u306b\u7d39\u4ecb\u3059\u308b\u306e\u3067\u306f\u306a\u304f\u3001\u50d5\u304c\u601d\u3046\u6700\u3082\u5b9f\u88c5\u30b3\u30b9\u30c8\u306e\u4f4e\u3044\u65b9\u6cd5\u3092\u3054\u7d39\u4ecb\u3057\u307e\u3059\uff01<\/p>\n\n\n\n<div class=\"toc\"><br \/>\n<b>Warning<\/b>:  Undefined array key \"is_admin\" in <b>\/home\/c4179872\/public_html\/hirabay.net\/wp-content\/themes\/sango-theme\/library\/gutenberg\/dist\/classes\/Toc.php<\/b> on line <b>110<\/b><br \/>\n<br \/>\n<b>Warning<\/b>:  Undefined array key \"is_category_top\" in <b>\/home\/c4179872\/public_html\/hirabay.net\/wp-content\/themes\/sango-theme\/library\/gutenberg\/dist\/classes\/Toc.php<\/b> on line <b>115<\/b><br \/>\n<br \/>\n<b>Warning<\/b>:  Undefined array key \"is_top\" in <b>\/home\/c4179872\/public_html\/hirabay.net\/wp-content\/themes\/sango-theme\/library\/gutenberg\/dist\/classes\/Toc.php<\/b> on line <b>122<\/b><br \/>\n    <div id=\"toc_container\" class=\"sgb-toc--bullets js-smooth-scroll\">\n      <p class=\"toc_title\">\u76ee\u6b21 <\/p>\n      <ul class=\"toc_list\">\n  <li class=\"first\">\n    <a href=\"#i-0\">\u5b9f\u88c5\u65b9\u6cd5<\/a>\n    <ul class=\"menu_level_1\">\n      <li class=\"first\">\n        <a href=\"#i-1\">\u540c\u671f\u51e6\u7406<\/a>\n      <\/li>\n      <li>\n        <a href=\"#i-2\">\u975e\u540c\u671f\u51e6\u7406<\/a>\n      <\/li>\n      <li class=\"last\">\n        <a href=\"#i-3\">\u975e\u540c\u671f\u51e6\u7406\uff08\u306a\u3093\u3061\u3083\u3063\u3066\u7de8\uff09<\/a>\n      <\/li>\n    <\/ul>\n  <\/li>\n  <li>\n    <a href=\"#i-4\">\u4f8b\u5916\u51e6\u7406<\/a>\n  <\/li>\n  <li class=\"last\">\n    <a href=\"#i-5\">\u5358\u4f53\u30c6\u30b9\u30c8<\/a>\n  <\/li>\n<\/ul>\n\n      \n    <\/div><\/div><h2 class=\"wp-block-heading\" id=\"i-0\">\u5b9f\u88c5\u65b9\u6cd5<\/h2>\n\n\n\n<p>SpringBoot\u3067\u306f<code>@Async<\/code>\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u3092\u4ed8\u4e0e\u3059\u308b\u3053\u3068\u3067\u3001\u7c21\u5358\u306b\u975e\u540c\u671f\u51e6\u7406\u3092\u5b9f\u88c5\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\uff01<\/p>\n\n\n\n<p>\u901a\u5e38\u306e\u540c\u671f\u51e6\u7406\u3068\u975e\u540c\u671f\u51e6\u7406\u3067\u5b9f\u88c5\u3068\u52d5\u4f5c\u3092\u307f\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-1\">\u540c\u671f\u51e6\u7406<\/h3>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism undefined-numbers lang-java\" data-file=\"\u30b5\u30f3\u30d7\u30eb\u30af\u30e9\u30b9\" data-lang=\"Java\"><code>@Component\npublic class SampleService {\n    public String sample(int num) throws InterruptedException {\n        System.out.println(\"start greeting %s.\".formatted(num));\n        TimeUnit.SECONDS.sleep(5);\n        System.out.println(\"end greeting %s.\".formatted(num));\n        return \"result %s\".formatted(num);\n    }\n}<\/code><\/pre><\/div>\n\n\n\n<p>\u3053\u306e\u30af\u30e9\u30b9\u3092\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u547c\u3073\u51fa\u3057\u3066\u307f\u307e\u3059\u3002\u203bSpringBootTest\u306e\u30c6\u30b9\u30c8\u30af\u30e9\u30b9\u3067\u5b9f\u88c5<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism undefined-numbers lang-java\" data-lang=\"Java\"><code>    @Autowired\n    private SampleService sampleService;\n\n    @Test\n    void test_sample() throws Exception {\n        var start = System.currentTimeMillis();\n\n        var result1 = sampleService.sample(1); \/\/ 5\u79d2\u304b\u304b\u308b\n        System.out.println(result1);\n\n        var result2 = sampleService.sample(2); \/\/ 5\u79d2\u304b\u304b\u308b\n        System.out.println(result2);\n\n        var end = System.currentTimeMillis();\n\n        System.out.printf(\"time: %s ms%n\", end - start);\n    }<\/code><\/pre><\/div>\n\n\n\n<p>\u9806\u306b\u51e6\u7406\u3092\u3059\u308b\u306e\u3067 5\u79d2 + 5\u79d2 \u3067\u30c8\u30fc\u30bf\u30eb10\u79d2\u304b\u304b\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism undefined-numbers lang-plain\" data-file=\"\u30ed\u30b0\"><code>start 1.\nend 1.\nresult 1\nstart 2.\nend 2.\nresult 2\ntime: 10012 ms<\/code><\/pre><\/div>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-2\">\u975e\u540c\u671f\u51e6\u7406<\/h3>\n\n\n\n<p>\u305d\u308c\u3067\u306f\u4e0a\u8a18\u306e<code>SampleService<\/code>\u30af\u30e9\u30b9\u3092\u975e\u540c\u671f\u51e6\u7406\u304c\u3067\u304d\u308b\u3088\u3046\u306b\u66f8\u304d\u63db\u3048\u305f<code>FutureSampleService<\/code>\u3092\u5b9f\u88c5\u3057\u307e\u3059\u3002<br><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism undefined-numbers lang-java\" data-lang=\"Java\"><code>@Component\npublic class FutureSampleService {\n    @Async \/\/ @Async\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u3092\u4ed8\u4e0e\u3059\u308b\uff08private\u306e\u3088\u3046\u306a\u5185\u90e8\u3067\u547c\u3073\u51fa\u3059\u30e1\u30bd\u30c3\u30c9\u306b\u4ed8\u4e0e\u3057\u3066\u3082\u610f\u5473\u306a\u3044\u306e\u3067\u6ce8\u610f\uff09\n    public CompletableFuture&lt;String&gt; sample(int num) throws InterruptedException {\n        System.out.println(\"start greeting %s.\".formatted(num));\n        TimeUnit.SECONDS.sleep(5);\n        System.out.println(\"end greeting %s.\".formatted(num));\n        \n        \/\/ \u623b\u308a\u5024\u306f\u3001\u300cCompletableFuture.completedFuture\u300d\u3067wrap\u3059\u308b\n        return CompletableFuture.completedFuture(\"result %s\".formatted(num));\n    }\n}<\/code><\/pre><\/div>\n\n\n\n<p>\u6b21\u306b\u547c\u3073\u51fa\u3057\u5143\u306e\u5b9f\u88c5\u3082\u4fee\u6b63\u3057\u307e\u3059\u3002<br>\u203b\u7d50\u679c\u306e\u53d6\u5f97\u306f\u3001\u3053\u306e\u9806\u3067\u306a\u304f\u3066\u3082\u826f\u3044\u3067\u3059\u304c\u3001\u300c\u30e1\u30bd\u30c3\u30c9\u5b9f\u884c\u300d\u2192\u300cjoin\u300d\u2192\u300c\u5229\u7528\u300d\u3068\u3057\u3066\u304a\u304f\u3068\u30b7\u30f3\u30d7\u30eb\u3067\u898b\u901a\u3057\u304c\u826f\u3044\u304b\u306a\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism undefined-numbers lang-java\" data-lang=\"Java\"><code>    @Autowired\n    FutureSampleService futureSampleService;\n\n    @Test\n    void test_future_sample() throws Exception {\n        var start = System.currentTimeMillis();\n\n        \/\/ \u4e26\u5217\u3067\u5b9f\u884c\u3057\u305f\u3044\u51e6\u7406\u3092\u3059\u3079\u3066\u547c\u3073\u51fa\u3059\n        var resultFuture1 = futureSampleService.sample(1);\n        var resultFuture2 = futureSampleService.sample(2);\n        \/\/ \u7d50\u679c\u3092join\u3067\u53d6\u5f97\u3059\u308b\n        var result1 = resultFuture1.join();\n        var result2 = resultFuture2.join();\n        \/\/ \u7d50\u679c\u3092\u5229\u7528\u3059\u308b\uff08\u4ee5\u964d\u306f\u76f4\u5217\u51e6\u7406\u3068\u4e00\u7dd2\uff09\n        System.out.println(result1);\n        System.out.println(result2);\n\n        var end = System.currentTimeMillis();\n        System.out.printf(\"time: %s ms%n\", end - start);\n    }<\/code><\/pre><\/div>\n\n\n\n<p>\u6700\u5f8c\u306b\u3001@Async\u3067\u306e\u975e\u540c\u671f\u51e6\u7406\u3092\u6709\u52b9\u306b\u3059\u308b\u305f\u3081\u306b\u3001<code>@EnableAsync<\/code>\u3092main\u30af\u30e9\u30b9\u306b\u4ed8\u4e0e\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism undefined-numbers lang-java\" data-lang=\"Java\"><code>@EnableAsync \/\/ \u4ed8\u4e0e\u3059\u308b\u306e\u306f@Configuration\u306e\u3064\u3044\u305f\u30af\u30e9\u30b9\u3067\u3082OK\n@SpringBootApplication\npublic class SampleApplication {\n\n\tpublic static void main(String[] args) {\n\t\tSpringApplication.run(SampleApplication.class, args);\n\t}\n}<\/code><\/pre><\/div>\n\n\n\n<p>\u5b9f\u884c\u3057\u3066\u307f\u308b\u3068\u3001\u3001\u3001<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism undefined-numbers lang-plain\" data-file=\"\u30ed\u30b0\"><code>start 2.\nstart 1.\nend 2.\nend 1.\nresult 1\nresult 2\ntime: 5011 ms<\/code><\/pre><\/div>\n\n\n\n<p>\u975e\u540c\u671f\u306a\u51e6\u7406\u3092\u4e26\u5217\u3067\u5b9f\u884c\u3057\u305f\u3053\u3068\u3067\u30011\u3064\u306e\u30e1\u30bd\u30c3\u30c9\u51e6\u7406\u6642\u9593\u5206\u3067\uff12\u3064\u306e\u30e1\u30bd\u30c3\u30c9\u3092\u5b9f\u884c\u3067\u304d\u307e\u3057\u305f\ud83c\udf89<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-3\">\u975e\u540c\u671f\u51e6\u7406\uff08\u306a\u3093\u3061\u3083\u3063\u3066\u7de8\uff09<\/h3>\n\n\n\n<p>\u975e\u540c\u671f\u51e6\u7406\u306e\u5b9f\u88c5\u6642\u306b\u306f\u30e1\u30bd\u30c3\u30c9\u306e\u547c\u3073\u51fa\u3057\u9806\u304c\u91cd\u8981\u306b\u306a\u3063\u3066\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u30e1\u30bd\u30c3\u30c9\u306e\u547c\u3073\u51fa\u3057\u9806\u3092\u5165\u308c\u66ff\u3048\u3066\u5b9f\u884c\u3057\u3066\u307f\u307e\u3059\u3002<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism undefined-numbers lang-java\" data-lang=\"Java\"><code>    @Test\n    void test_future_sample_ng() throws Exception {\n        var start = System.currentTimeMillis();\n        \n        var resultFuture1 = sampleService.sample(1);\n        var result1 = resultFuture1.join(); \/\/ join\u3092\u547c\u3073\u51fa\u3059\u3068\u3001\u51e6\u7406\u304c\u7d42\u308f\u308b\u307e\u3067\u30d6\u30ed\u30c3\u30af\u3059\u308b\n        System.out.println(result1);\n        \n        var resultFuture2 = sampleService.sample(2);\n        var result2 = resultFuture2.join();\n        System.out.println(result2);\n\n        var end = System.currentTimeMillis();\n        System.out.printf(\"time: %s ms%n\", end - start);\n    }<\/code><\/pre><\/div>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism undefined-numbers lang-plain\" data-file=\"\u30ed\u30b0\"><code>start 1.\nend 1.\nresult 1\nstart 2.\nend 2.\nresult 2\ntime: 10020 ms<\/code><\/pre><\/div>\n\n\n\n<p>\u3068\u3001\u540c\u671f\u51e6\u7406\u3068\u540c\u3058\u7d50\u679c\u306b\u306a\u3063\u3066\u3057\u307e\u3044\u307e\u3057\u305f\u3002\u3002\u3002<\/p>\n\n\n\n<p>\u975e\u540c\u671f\u51e6\u7406\u306e\u6069\u6075\u3092\u53d7\u3051\u308b\u306b\u306f\u3001\u300c<span class=\"keiko_yellow\">\u975e\u540c\u671f\u51e6\u7406\u3092\u547c\u3073\u51fa\u3057\u3001<code>join()<\/code>\u3092\u547c\u3073\u51fa\u3059\u524d\u306b\u5225\u306e\u975e\u540c\u671f\u51e6\u7406\u3092\u547c\u3073\u51fa\u3059<\/span>\u300d\u3053\u3068\u304c\u91cd\u8981\u3067\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-4\">\u4f8b\u5916\u51e6\u7406<\/h2>\n\n\n\n<p>\u307e\u305a\u306f\u975e\u540c\u671f\u51e6\u7406\u5074\u306e\u4f8b\u5916\u30b9\u30ed\u30fc\u306e\u5b9f\u88c5\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u901a\u5e38\u306e<code>throw<\/code>\u53e5\u3067\u306f\u306a\u304f\u3001<code>CompletableFuture.failedFuture<\/code>\u306b\u4f8b\u5916\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u8a2d\u5b9a\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u203bRuntimeException\u3092\u7d99\u627f\u3057\u305f\u4f8b\u5916\u3067\u3042\u308c\u3070\u3001<code>throw<\/code>\u53e5\u3067\u3082OK\u3067\u3059\u3002<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism undefined-numbers lang-java\" data-lang=\"Java\"><code>    @Async\n    public CompletableFuture&lt;String&gt; error(int num) {\n        return CompletableFuture.failedFuture(new CustomException(\"error %s\".formatted(num)));\n    }\n\n    class CustomException extends Exception {\n        public CustomException(String message) {\n            super(message);\n        }\n    }<\/code><\/pre><\/div>\n\n\n\n<p>\u547c\u3073\u51fa\u3057\u5143\u3067\u306f\u3001join()\u5b9f\u884c\u6642\u306b\u4f8b\u5916\u51e6\u7406\u3092\u884c\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism undefined-numbers lang-java\" data-lang=\"Java\"><code>    @Test\n    void test_future_sample_exception() {\n\n        var resultFuture1 = futureSampleService.error(1);\n        var resultFuture2 = futureSampleService.error(2);\n\n        \/\/ try - catch\u3067\u4f8b\u5916\u51e6\u7406\n        try {\n            resultFuture1.join();\n        } catch (CompletionException ex) { \/\/ \u4f8b\u5916\u306f\u3059\u3079\u3066CompletionException\u306bwrap\u3055\u308c\u308b\n            System.out.println(ex.getCause().getMessage());\n        }\n\n        \/\/ \u30e1\u30bd\u30c3\u30c9\u30c1\u30a7\u30fc\u30f3\u3067\u4f8b\u5916\u51e6\u7406\n        var result = resultFuture2.exceptionally(ex -&gt; {\n            \/\/ \u4f8b\u5916\u306f\u3059\u3079\u3066CompletionException\u306bwrap\u3055\u308c\u308b\n            if (ex instanceof CompletionException completionException) {\n                return completionException.getCause().getMessage();\n            } else {\n                return \"unexpected\";\n            }\n        }).join();\n        System.out.println(result);\n    }<\/code><\/pre><\/div>\n\n\n\n<div class=\"wp-block-sgb-say\"><div class=\"sgb-block-say sgb-block-say--left\"><div class=\"sgb-block-say-avatar\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/hirabay.net\/wp-content\/uploads\/2023\/01\/8587387ec297d96871b842816a3e545b.png\" alt=\"\u3072\u3089\u3079\u30fc\" width=\"80\" height=\"80\" style=\"border-color:#eaedf2\"><div class=\"sgb-block-say-avatar__name\">\u3072\u3089\u3079\u30fc<\/div><\/div><div class=\"sgb-block-say-text\"><div class=\"sgb-block-say-text__content\" style=\"color:#333;border-color:#d5d5d5;background-color:#FFF\">\n<p>\u547c\u3073\u51fa\u3057\u5143\u3067\u4f8b\u5916\u51e6\u7406\u3092\u884c\u3046\u3068\u7d50\u69cb\u3054\u3061\u3083\u3064\u304f\u306e\u3067\u3001<br>\u975e\u540c\u671f\u51e6\u7406\u306e\u4e2d\u3067\u4f8b\u5916\u51e6\u7406\u3092\u62bc\u3057\u8fbc\u3081\u308b\u65b9\u304c\u30b9\u30c3\u30ad\u30ea\u3059\u308b\u306e\u304b\u3082\uff1f<\/p>\n<span class=\"sgb-block-say-text__before\" style=\"border-right-color:#d5d5d5\"><\/span><span class=\"sgb-block-say-text__after\" style=\"border-right-color:#FFF\"><\/span><\/div><\/div><\/div><\/div>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-5\">\u5358\u4f53\u30c6\u30b9\u30c8<\/h2>\n\n\n\n<p>\u6700\u5f8c\u306b\u3001JUnit5\u3092\u7528\u3044\u305f\u5358\u4f53\u30c6\u30b9\u30c8\u306e\u5b9f\u88c5\u30b5\u30f3\u30d7\u30eb\u3067\u3059\uff01<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism undefined-numbers lang-java\" data-lang=\"Java\"><code>    @Test\n    void test() throws InterruptedException {\n        var actual1 = futureSampleService.sample(1);\n        assertThat(actual1.join()).isEqualTo(\"result 1\");\n\n        var actual2 = futureSampleService.error(2);\n        var completionException = assertThrows(CompletionException.class, actual2::join);\n        assertThat(completionException.getCause().getMessage()).isEqualTo(\"error 2\");\n    }<\/code><\/pre><\/div>\n","protected":false},"excerpt":{"rendered":"<p>SpringBoot\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3067\u306e\u4e26\u5217\u51e6\u7406\u30fb\u975e\u540c\u671f\u51e6\u7406\u306b\u3064\u3044\u3066\u3001\u5b9f\u88c5\u65b9\u6cd5\u3092\u3054\u7d39\u4ecb\u3057\u307e\u3059\uff01 \u4e26\u5217\u51e6\u7406\u30fb\u975e\u540c\u671f\u51e6\u7406\u3092\u5b9f\u88c5\u3059\u308b\u3068\u3001\u8907\u6570\u306e\u51e6\u7406\u3092\u3044\u3063\u307a\u3093\u306b\u5b9f\u884c\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u306e\u3067\u5168\u4f53\u306e\u51e6\u7406\u901f\u5ea6\u306e\u5411\u4e0a\u304c\u898b\u8fbc\u3081\u307e\u3059\uff01 \u4e00\u65b9\u3001\u76f4 &#8230; <\/p>\n","protected":false},"author":1,"featured_media":710,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6],"tags":[13],"class_list":{"0":"post-708","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-6","8":"tag-springboot"},"jetpack_featured_media_url":"https:\/\/hirabay.net\/wp-content\/uploads\/2024\/01\/a11b4bb3ba448d1fa402ac3dc62cc91f.png","_links":{"self":[{"href":"https:\/\/hirabay.net\/index.php?rest_route=\/wp\/v2\/posts\/708","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/hirabay.net\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/hirabay.net\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/hirabay.net\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/hirabay.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=708"}],"version-history":[{"count":3,"href":"https:\/\/hirabay.net\/index.php?rest_route=\/wp\/v2\/posts\/708\/revisions"}],"predecessor-version":[{"id":713,"href":"https:\/\/hirabay.net\/index.php?rest_route=\/wp\/v2\/posts\/708\/revisions\/713"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/hirabay.net\/index.php?rest_route=\/wp\/v2\/media\/710"}],"wp:attachment":[{"href":"https:\/\/hirabay.net\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=708"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/hirabay.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=708"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/hirabay.net\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=708"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}