{"id":456,"date":"2022-07-17T10:53:47","date_gmt":"2022-09-26T09:05:36","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/index.php\/2023\/11\/30\/java%e3%81%aeclassnotfoundexception%e3%81%af%e3%80%81java-lang-classnotfoundexception%e3%81%a8%e3%81%84%e3%81%86%e3%82%a8%e3%83%a9%e3%83%bc%e3%81%a7%e3%81%99%e3%80%82\/"},"modified":"2025-07-31T23:44:15","modified_gmt":"2025-07-31T14:44:15","slug":"java%e3%81%aeclassnotfoundexception%e3%81%af%e3%80%81java-lang-classnotfoundexception%e3%81%a8%e3%81%84%e3%81%86%e3%82%a8%e3%83%a9%e3%83%bc%e3%81%a7%e3%81%99%e3%80%82","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/java%e3%81%aeclassnotfoundexception%e3%81%af%e3%80%81java-lang-classnotfoundexception%e3%81%a8%e3%81%84%e3%81%86%e3%82%a8%e3%83%a9%e3%83%bc%e3%81%a7%e3%81%99%e3%80%82\/","title":{"rendered":"Java\u306eClassNotFoundException\u306f\u3001java.lang.ClassNotFoundException\u3068\u3044\u3046\u30a8\u30e9\u30fc\u3067\u3059\u3002"},"content":{"rendered":"<h2>Java\u306eClassNotFoundException<\/h2>\n<ul class=\"post-ul\">\n<li>Java ClassNotFoundException occurs when the application tries to load a class but Classloader is not able to find it in the classpath.<\/li>\n<li>Common causes of java.lang.ClassNotFoundException are using Class.forName or ClassLoader.loadClass to load a class by passing String name of a class and it\u2019s not found on the classpath.<\/li>\n<li>ClassNotFoundException is a checked exception, so it has to be catch or thrown to the caller.<\/li>\n<li>ClassNotFoundException always occurs at runtime because we are indirectly loading the class using Classloader. Java compiler has no way to know if the class will be present in the classpath at runtime or not.<\/li>\n<li>One of the most common example of ClassNotFoundException is when we try to load JDBC drivers using Class.forName but forget to add it\u2019s jar file in the classpath.<\/li>\n<\/ul>\n<h2>Java\u306eClassNotFoundException\u306e\u4f8b<\/h2>\n<p>\u7c21\u5358\u306a\u4f8b\u3092\u898b\u3066\u3001ClassNotFoundException\u304c\u767a\u751f\u3059\u308b\u5834\u5408\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n<pre class=\"post-pre\"><code>package com.scdev.exceptions;\r\n\r\npublic class DataTest {\r\n\r\n  public static void main(String[] args) {\r\n    try {\r\n      Class.forName(\"com.scdev.MyInvisibleClass\");\r\n\r\n      ClassLoader.getSystemClassLoader().loadClass(\"com.scdev.MyInvisibleClass\");\r\n\r\n      ClassLoader.getPlatformClassLoader().loadClass(\"com.scdev.MyInvisibleClass\");\r\n    } catch (ClassNotFoundException e) {\r\n      e.printStackTrace();\r\n    }\r\n  }\r\n\r\n}\r\n<\/code><\/pre>\n<p>\u4e0a\u8a18\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u5b9f\u884c\u3059\u308b\u3068\u3001com.scdev.MyInvisibleClass\u304c\u5b58\u5728\u3057\u306a\u3044\u3053\u3068\u306b\u6ce8\u610f\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u305d\u306e\u7d50\u679c\u3001\u4ee5\u4e0b\u306e\u4f8b\u5916\u306e\u30b9\u30bf\u30c3\u30af\u30c8\u30ec\u30fc\u30b9\u304c\u8868\u793a\u3055\u308c\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code>java.lang.ClassNotFoundException: com.scdev.MyInvisibleClass\r\n\tat java.base\/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:582)\r\n\tat java.base\/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:185)\r\n\tat java.base\/java.lang.ClassLoader.loadClass(ClassLoader.java:496)\r\n\tat java.base\/java.lang.Class.forName0(Native Method)\r\n\tat java.base\/java.lang.Class.forName(Class.java:292)\r\n\tat com.scdev.exceptions.DataTest.main(DataTest.java:7)\r\n<\/code><\/pre>\n<p>\u4e0a\u8a18\u306e\u4f8b\u3067\u306f\u3001\u3059\u3079\u3066\u306e3\u3064\u306e\u6587\u304cjava.lang.ClassNotFoundException\u3092\u30b9\u30ed\u30fc\u3057\u307e\u3059\u3002<\/p>\n<h2>ClassNotFoundException\u3092\u89e3\u6c7a\u3059\u308b\u65b9\u6cd5<\/h2>\n<p>ClassNotFoundException\u3092\u4fee\u6b63\u3059\u308b\u306e\u306f\u975e\u5e38\u306b\u7c21\u5358\u3067\u3059\u3002\u306a\u305c\u306a\u3089\u3001\u4f8b\u5916\u306e\u30b9\u30bf\u30c3\u30af\u30c8\u30ec\u30fc\u30b9\u304c\u660e\u78ba\u306b\u30af\u30e9\u30b9\u304c\u898b\u3064\u304b\u3089\u306a\u3044\u3053\u3068\u3092\u793a\u3057\u3066\u3044\u308b\u304b\u3089\u3067\u3059\u3002\u30af\u30e9\u30b9\u30d1\u30b9\u306e\u8a2d\u5b9a\u3092\u78ba\u8a8d\u3057\u3066\u3001\u5b9f\u884c\u6642\u306b\u30af\u30e9\u30b9\u304c\u5b58\u5728\u3059\u308b\u3053\u3068\u3092\u78ba\u8a8d\u3059\u308b\u3060\u3051\u3067\u3059\u3002<\/p>\n<h2>ClassNotFoundException\u3068NoClassDefFoundError\u306e\u9055\u3044\u306b\u3064\u3044\u3066\u8aac\u660e\u3057\u307e\u3059\u3002<\/h2>\n<p>NoClassDefFoundError\u306f\u3001\u5b9f\u884c\u6642\u306b\u30af\u30e9\u30b9\u304c\u898b\u3064\u304b\u3089\u306a\u3044\u3068\u304d\u306b\u767a\u751f\u3059\u308b\u30e9\u30f3\u30bf\u30a4\u30e0\u30a8\u30e9\u30fc\u3067\u3059\u3002ClassNotFoundException\u3068\u975e\u5e38\u306b\u4f3c\u3066\u3044\u307e\u3059\u3002\u8a73\u3057\u304f\u306fJava NoClassDefFoundError\u3092\u53c2\u7167\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u53c2\u8003\uff1aAPI\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Java\u306eClassNotFoundException Java ClassNotFoundException occurs when the application tries to load a class but  [&hellip;]<\/p>\n","protected":false},"author":6,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[26,61],"class_list":["post-456","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-26","tag-61"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - 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