{"id":1046,"date":"2011-10-13T19:29:54","date_gmt":"2011-10-13T10:29:54","guid":{"rendered":"http:\/\/blog.rutake.com\/techmemo\/?p=1046"},"modified":"2015-07-29T15:54:28","modified_gmt":"2015-07-29T06:54:28","slug":"classnotfoundexception%e3%81%ae%e5%8e%9f%e5%9b%a0%e3%81%a8%e5%af%be%e7%ad%96","status":"publish","type":"post","link":"https:\/\/blog.rutake.com\/techmemo\/2011\/10\/13\/classnotfoundexception%e3%81%ae%e5%8e%9f%e5%9b%a0%e3%81%a8%e5%af%be%e7%ad%96\/","title":{"rendered":"ClassNotFoundException\u306e\u539f\u56e0\u3068\u5bfe\u7b56"},"content":{"rendered":"

English Post: ClassNotFoundException cause and solution.<\/a><\/p>\n

ClassNotFoundException\u306e\u539f\u56e0\u306fNoClassDefFoundError\u306a\u3069\u306b\u6bd4\u3079\u308b\u3068\u308f\u304b\u308a\u3084\u3059\u3044\u3002<\/p>\n

ClassForName\u3057\u3066\u3044\u308b\u3068\u3053\u308d\u304c\u539f\u56e0\u306a\u306e\u3067\u3001\u305f\u3044\u3066\u3044\u306f\u5f15\u6570\u306e\u30af\u30e9\u30b9\u540d\u306e\u30b9\u30da\u30eb\u30df\u30b9\u3002<\/p>\n

\u3053\u306e\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3059\u308b\u3068\u304d\u306f\u3001\u9593\u63a5\u7684\u306b\u3057\u3066\u3044\u308bClassForName\u3092\u4f7f\u3063\u3066\u3044\u308b\u30b1\u30fc\u30b9\u304c\u307b\u3068\u3093\u3069\u3060\u308d\u3046\u3002<\/p>\n

\u4e00\u4f8b\u3068\u3057\u3066\u3001web.xml\u306eServlet\u3084Filter\u306e\u5b9a\u7fa9\u3067\u30af\u30e9\u30b9\u540d\u304c\u9593\u9055\u3063\u3066\u3044\u308b\u3068\u3053\u308c\u307e\u305fTomcat\u8d77\u52d5\u6642\u306bClassNotFoundException\u3067\u843d\u3061\u308b\u3002
\n\u305d\u306e\u5834\u5408\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u30e1\u30c3\u30bb\u30fc\u30b8\u304c\u3067\u3066Tomcat\u306e\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u8d77\u52d5\u306b\u5931\u6557\u3059\u308b\u3002\u3053\u306e\u5834\u5408\u8a72\u5f53Servlet\u306f\u5229\u7528\u4e0d\u53ef\u80fd\u3068\u306a\u308b\u306e\u3067\u3001\u300cthe requested resource is not available.\u300d\u306e404\u30a8\u30e9\u30fc\u306e\u771f\u306e\u539f\u56e0\u3068\u306a\u308b\u3053\u3068\u3082\u591a\u3044\u3002<\/p>\n

\u81f4\u547d\u7684: \u30d5\u30a3\u30eb\u30bf xxxFilter \u306e\u8d77\u52d5\u4e2d\u306e\u4f8b\u5916\u3067\u3059
\njava.lang.ClassNotFoundException: com.rutake.xxxFilter<\/p>\n

<\/a><\/p>\n

Java\u30bd\u30fc\u30b9\u30b3\u30fc\u30c9\u3067\u3084\u308a\u304c\u3061\u306a\u306e\u306f\u30d1\u30c3\u30b1\u30fc\u30b8\u540d\u3092\u7565\u3057\u3066\u3001ClassNotFoundException\u3092\u767a\u751f\u3055\u305b\u308b\u30b1\u30fc\u30b9\u3002<\/p>\n

[java]
\n\/\/ \u30d1\u30c3\u30b1\u30fc\u30b8\u540d\u307e\u3067\u542b\u3081\u3066\u66f8\u304b\u306a\u3044\u3068\u30c0\u30e1\u306a\u306e\u3067\u4ee5\u4e0b\u306fClassNotFoundException\u304c\u51fa\u308b
\nClass.forName(“String”).newInstance();
\n\/\/ \u3053\u308c\u306a\u3089ClassNotFoundException\u306f\u51fa\u306a\u3044
\nClass.forName(“java.lang.String”).newInstance();
\n[\/java]<\/p>\n

\u30d1\u30c3\u30b1\u30fc\u30b8\u540d\u307e\u3067\u542b\u3081\u3066\u30af\u30e9\u30b9\u306e\u30b9\u30da\u30eb\u304c\u6b63\u3057\u3044\u306e\u306a\u3089NoClassDefFoundError\u3068\u540c\u3058\u5bfe\u51e6\u6cd5\u3067jar\u30e9\u30a4\u30d6\u30e9\u30ea\u306e\u4e2d\u8eab\u3092\u30c1\u30a7\u30c3\u30af\uff01<\/p>\n

\u30c1\u30a7\u30c3\u30af\u30dd\u30a4\u30f3\u30c8\u306f\u4ee5\u4e0b\u306e\uff12\u70b9<\/p>\n

\u30fb\u30af\u30e9\u30b9\u30d1\u30b9\u306b\u8a72\u5f53\u30af\u30e9\u30b9\u306ejar\u304c\u542b\u307e\u308c\u3066\u3044\u308b\u304b
\n\u30fb\u305d\u306ejar\u30d5\u30a1\u30a4\u30eb\u306e\u4e2d\u306b\u6b63\u3057\u304f\u30af\u30e9\u30b9\u304c\u683c\u7d0d\u3055\u308c\u3066\u3044\u308b\u304b<\/p>\n

\u5927\u6982JDBC\u30c9\u30e9\u30a4\u30d0\u30fc\u306e\u7f6e\u304d\u5fd8\u308c\u3060\u3063\u305f\u308a\u3001\u30af\u30e9\u30b9\u540d\u304c\u5909\u66f4\u306b\u306a\u3063\u3066\u3044\u305f\u308a\u74b0\u5883\u8a2d\u5b9a\u306e\u30df\u30b9\u306b\u8d77\u56e0\u3059\u308b\u30a8\u30e9\u30fc\u306a\u306e\u3067\u308f\u304b\u3093\u306a\u304b\u3063\u305f\u3089\u6280\u8853\u9762\u53d6\u308a\u307e\u3068\u3081\u306e\u4eba\u306b\u805e\u3044\u3066\u307f\u308b\u3079\u3057\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"

English Post: ClassNotFoundException cau … \u7d9a\u304d\u3092\u8aad\u3080 →<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[10],"tags":[208],"_links":{"self":[{"href":"https:\/\/blog.rutake.com\/techmemo\/wp-json\/wp\/v2\/posts\/1046"}],"collection":[{"href":"https:\/\/blog.rutake.com\/techmemo\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.rutake.com\/techmemo\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.rutake.com\/techmemo\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.rutake.com\/techmemo\/wp-json\/wp\/v2\/comments?post=1046"}],"version-history":[{"count":7,"href":"https:\/\/blog.rutake.com\/techmemo\/wp-json\/wp\/v2\/posts\/1046\/revisions"}],"predecessor-version":[{"id":2056,"href":"https:\/\/blog.rutake.com\/techmemo\/wp-json\/wp\/v2\/posts\/1046\/revisions\/2056"}],"wp:attachment":[{"href":"https:\/\/blog.rutake.com\/techmemo\/wp-json\/wp\/v2\/media?parent=1046"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.rutake.com\/techmemo\/wp-json\/wp\/v2\/categories?post=1046"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.rutake.com\/techmemo\/wp-json\/wp\/v2\/tags?post=1046"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}