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java.lang.IllegalStateException: Neither BindingResult nor plain target object for bean name 'user'

2017-08-07 15:24 507 查看
场景：在《spring+mybatis企业应用实战》一书中第五章，当使用spring mvc国际化时，因为在jsp中没有引入一个实体类（在Page 90页有个loginForm.jsp代码），导致运行时抛出异常：java.lang.IllegalStateException: Neither BindingResult nor plain target object for bean name 'user' available as request attribute，具体异常如下：严重: Neither BindingResult nor plain target object for bean name 'user' available as request attribute
java.lang.IllegalStateException: Neither BindingResult nor plain target object for bean name 'user' available as request attribute
at org.springframework.web.servlet.support.BindStatus.<init>(BindStatus.java:144)
at org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag.getBindStatus(AbstractDataBoundFormElementTag.java:168)
at org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag.getPropertyPath(AbstractDataBoundFormElementTag.java:188)
at org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag.getName(AbstractDataBoundFormElementTag.java:154)
at org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag.autogenerateId(AbstractDataBoundFormElementTag.java:141)
at org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag.resolveId(AbstractDataBoundFormElementTag.java:132)
at org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag.writeDefaultAttributes(AbstractDataBoundFormElementTag.java:116)
at org.springframework.web.servlet.tags.form.AbstractHtmlElementTag.writeDefaultAttributes(AbstractHtmlElementTag.java:422)
at org.springframework.web.servlet.tags.form.InputTag.writeTagContent(InputTag.java:142)
at org.springframework.web.servlet.tags.form.AbstractFormTag.doStartTagInternal(AbstractFormTag.java:84)
at org.springframework.web.servlet.tags.RequestContextAwareTag.doStartTag(RequestContextAwareTag.java:80)
at org.apache.jsp.WEB_002dINF.views.home_jsp._jspx_meth_form_005finput_005f0(home_jsp.java:245)
at org.apache.jsp.WEB_002dINF.views.home_jsp._jspx_meth_form_005fform_005f0(home_jsp.java:166)
at org.apache.jsp.WEB_002dINF.views.home_jsp._jspService(home_jsp.java:87)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:432)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:395)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:339)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)出问题的页面代码：
<%@page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8" %>
<%@taglib prefix="form" uri="http://www.springframework.org/tags/form" %>
<%@taglib prefix="spring" uri="http://www.springframework.org/tags" %>
<html>
<head>
<meta http-equiv="content-type" content="text/html;charset=UTF-8">
<title>测试基于浏览器请求的国际化</title>
</head>
<body><h2><spring:message code="title"/></h2>
<form:form modelAttribute="user" method="post" action="login">
<table>
<tr>
<td><spring:message code="loginname"/></td>
<td><form:input path="loginname"/></td>
</tr>
<tr>
<td><spring:message code="password"/></td>
<td><form:input path="password"/></td>
</tr>
<tr>
<td><input type="submit" value="<spring:message code="submit"/>"></td>
</tr>
</table>
</form:form></body>
</html>
原因：觉得应该是 modelAttribute="user" 这句问题，可以查看标签说明（在spring-form.tld）中这么描述：
<attribute>
<description>Name of the model attribute under which the form object is exposed.
Defaults to 'command'.</description>
<name>modelAttribute</name>
<required>false</required>
<rtexprvalue>true</rtexprvalue>
</attribute>（可以参考这篇博客：http://blog.csdn.net/fclwd/article/details/9401531）
解决：在jsp中添加：<jsp:useBean id="user" class="com.demo.domain.User" scope="request"/>

                                            

                                        

                        
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