bean not found within scope

本文介绍了解决jsp:useBean标签中使用type属性而非class属性导致的问题。当使用type属性时,可能会遇到bean未找到的异常。通过将type更改为class可以避免此问题。

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当登入信息销毁时,获取bean中的用户信息时出错
java.lang.InstantiationException: bean login not found within scope

解决方法:
Java code

1<jsp:useBean id="person" type="bean.Bean_person" scope="request"/>

把它改成
Java code

1<jsp:useBean id="person" class="bean.Bean_person" scope="request"/>

也就是将type改为class

例外情况 org.apache.jasper.JasperException: 在 [36] 行处理 [/jsp/admin/login.jsp] 时发生异常 33: </script> 34: </head> 35: <body> 36: <jsp:useBean id="infoList" scope="request" type="java.util.List"/> 37: <c:if test="${!empty infoList}"> 38: <c:forEach items="${infoList}" var="i"> 39: <script type="text/javascript"> Stacktrace: org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:602) org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:489) org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:382) org.apache.jasper.servlet.JspServlet.service(JspServlet.java:330) javax.servlet.http.HttpServlet.service(HttpServlet.java:733) org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) com.shine.bookshop.filter.FilterLogin.doFilter(FilterLogin.java:45) com.shine.bookshop.filter.FilterEnconding.doFilter(FilterEnconding.java:41) 根本原因。 javax.servlet.ServletException: java.lang.InstantiationException: bean infoList not found within scope org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextImpl.java:906) org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:835) org.apache.jsp.jsp.admin.login_jsp._jspService(login_jsp.java:206) org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:71) javax.servlet.http.HttpServlet.service(HttpServlet.java:733) org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:466) org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:382) org.apache.jasper.servlet.JspServlet.service(JspServlet.java:330) javax.servlet.http.HttpServlet.service(HttpServlet.java:733) org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) com.shine.bookshop.filter.FilterLogin.doFilter(FilterLogin.java:45) com.shine.bookshop.filter.FilterEnconding.doFilter(FilterEnconding.java:41) 根本原因。 java.lang.InstantiationException: bean infoList not found within scope org.apache.jsp.jsp.admin.login_jsp._jspService(login_jsp.java:164) org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:71) javax.servlet.http.HttpServlet.service(HttpServlet.java:733) org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:466) org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:382) org.apache.jasper.servlet.JspServlet.service(JspServlet.java:330) javax.servlet.http.HttpServlet.service(HttpServlet.java:733) org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) com.shine.bookshop.filter.FilterLogin.doFilter(FilterLogin.java:45) com.shine.bookshop.filter.FilterEnconding.doFilter(FilterEnconding.java:41)
最新发布
06-20
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