如何解决java.lang.IllegalStateException：BeanResult'UserDto'的BindingResult或普通目标对象都不能用作请求属性
Http页面
HTTP Status 500 – Internal Server Error
Type Exception Report
Message Request processing failed; nested exception is org.apache.tiles.impl.CannotRenderException: An exception occurred processing [WEB-INF/layout/baseLayout.jsp] at line [28]
Description The server encountered an unexpected condition that prevented it from fulfilling the request.
Exception
org.springframework.web.util.NestedServletException: Request processing failed; nested exception is org.apache.tiles.impl.CannotRenderException: An exception occurred processing [WEB-INF/layout/baseLayout.jsp] at line [28]
25: </tr>
26:
27: <tr>
28: <td><tiles:insertAttribute name="body" />
29: </td>
30: </tr>
31:
Stacktrace:
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:963)
org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:842)
javax.servlet.http.HttpServlet.service(HttpServlet.java:634)
org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:827)
javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
Root Cause
org.apache.tiles.impl.CannotRenderException: An exception occurred processing [WEB-INF/layout/baseLayout.jsp] at line [28]
25: </tr>
26:
27: <tr>
28: <td><tiles:insertAttribute name="body" />
29: </td>
30: </tr>
31:
tiles.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE tiles-definitions PUBLIC
"-//Apache Software Foundation//DTD Tiles Configuration 2.0//EN"
"http://tilles.apache.org/dtds/tiles-config_2_0.dtd">
<!-- scenario 1 -->
<tiles-definitions>
<definition name="baseTemplate" id="baseTemplate" template="/WEB-INF/layout/baseLayout.jsp">
<put-attribute name="header" value="/WEB-INF/layout/header.jsp" />
<put-attribute name="menu" value="/WEB-INF/layout/menu.jsp" />
<put-attribute name="body" value="${body}" />
<put-attribute name="footer" value="/WEB-INF/layout/footer.jsp" />
</definition>
<definition name="login" id="login" extends="baseTemplate">
<put-attribute name="body" value="/WEB-INF/jsp/login.jsp" />
</definition>
<definition name="regis" id="regis" extends="baseTemplate">
<put-attribute name="body" value="/WEB-INF/jsp/registration.jsp" />
</definition>
</tiles-definitions>
registration.jsp
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<%@taglib uri="http://www.springframework.org/tags/form" prefix="form"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/fmt" prefix="fmt"%>
<html>
<body>
<form:form method="POST" modelAttribute="UserDto"
action="submitRegis.do">
<table width="100%" border="0">
<tr>
<td>name <form:input path="name" />
</td>
</tr>
<tr>
<td>age <form:input path="age" />
</td>
</tr>
<tr>
<td>email <form:input path="email" />
</td>
</tr>
<tr>
<td>password <form:password path="password" />
</td>
</tr>
<tr>
<td><input type="submit" value="submit"></td>
</tr>
</table>
</form:form>
</body>
</html>
RegistrationController
@Controller
public class RegistrationControl {
@RequestMapping("/registering")
public String showRegistrationPage(Map<String,Object>map) {
System.out.println("Inside Registration Control");
UserDto usr=new UserDto();
map.put("userDto",usr);
return "regis";
}
** UserDto.java **
package com.pp.model;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Table;
@Entity
@Table(name = "user_dto")
public class UserDto {
@Id
@Column
@GeneratedValue(strategy = GenerationType.AUTO)
String email;
@Column
String password;
@Column
String name;
@Column
String age;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getAge() {
return age;
}
public void setAge(String age) {
this.age = age;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
}
在同一个项目中，我也有登录页面，但似乎工作正常，直到进行任何绑定例外。当我只是在注册页面而不是在属性中传递消息时，它就起作用了。
我不使用模型属性，因为现在我只在HTML页面上使用它。
解决方法
在registration.jsp中的modelAttribute是UserDto，而在RegistrationController中的map.put("userDto",usr);中，键是userDto。这就是为什么它无法绑定。
ModelAttribute和Key应该彼此匹配。
@Controller
public class RegistrationControl {
@RequestMapping("/registering")
public String showRegistrationPage(Map<String,Object>map) {
System.out.println("Inside Registration Control");
UserDto usr=new UserDto();
map.put("UserDto",usr);
return "regis";
}
现在一切正常。
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