{"id":290,"date":"2013-07-31T15:54:18","date_gmt":"2013-07-31T15:54:18","guid":{"rendered":"http:\/\/www.andreagirardi.it\/blog\/?p=290"},"modified":"2013-07-31T15:58:59","modified_gmt":"2013-07-31T15:58:59","slug":"jsp-error-attribute-qualified-names-must-be-unique-within-an-element","status":"publish","type":"post","link":"https:\/\/www.andreagirardi.it\/blog\/jsp-error-attribute-qualified-names-must-be-unique-within-an-element\/","title":{"rendered":"JSP Error : Attribute qualified names must be unique within an element"},"content":{"rendered":"<p>Today I updated an old Spring MVC application to Apache Tomcat 7 and some other newer jars and, when I started it, I get this error: <\/p>\n<pre lang=\"java\">\r\nSEVERE: Servlet.service() for servlet [mvc-dispatcher] in context with path [\/CG] threw exception [\/WEB-INF\/view\/main.jsp (line: 2, column: 0) \/WEB-INF\/view\/include.jsp (line: 3, column: 75) Attribute qualified names must be unique within an element] with root cause\r\norg.apache.jasper.JasperException: \/WEB-INF\/view\/main.jsp (line: 2, column: 0) \/WEB-INF\/view\/include.jsp (line: 3, column: 75) Attribute qualified names must be unique within an element\r\n<\/pre>\n<p>After some search i find out that using single attribute multiple time in a single tag throw this error(it works with no problem in previous version!!!)<\/p>\n<pre lang=\"java\">\r\n<%@ taglib prefix=\"fmt\" uri=\"http:\/\/java.sun.com\/jsp\/jstl\/fmt\" prefix=\"fmt\" %> \r\n<\/pre>\n<p>I removed the duplicated &#8220;prefix&#8221; tag and everything worked fine! (&#8230;ehm&#8230; everything? Of course not&#8230; but this exception has been fixed)<\/p>\n<div class=\"sharedaddy sd-sharing-enabled\"><div class=\"robots-nocontent sd-block sd-social sd-social-icon-text sd-sharing\"><h3 class=\"sd-title\">Share this:<\/h3><div class=\"sd-content\"><ul><li class=\"share-linkedin\"><a rel=\"nofollow\" data-shared=\"sharing-linkedin-290\" class=\"share-linkedin sd-button share-icon\" href=\"https:\/\/www.andreagirardi.it\/blog\/jsp-error-attribute-qualified-names-must-be-unique-within-an-element\/?share=linkedin\" target=\"_blank\" title=\"Click to share on LinkedIn\"><span>LinkedIn<\/span><\/a><\/li><li class=\"share-reddit\"><a rel=\"nofollow\" data-shared=\"\" class=\"share-reddit sd-button share-icon\" href=\"https:\/\/www.andreagirardi.it\/blog\/jsp-error-attribute-qualified-names-must-be-unique-within-an-element\/?share=reddit\" target=\"_blank\" title=\"Click to share on Reddit\"><span>Reddit<\/span><\/a><\/li><li class=\"share-twitter\"><a rel=\"nofollow\" 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