HTTP状态500-java.lang.IllegalStateException:bean name'；的BindingResult和普通目标对象都不是；myUser'；可用作请求属性

我有个问题。xml不加载Welcome.jsp，而且我写的controller@RequestMapping值也是正确的，我假设它是URL，并且必须将req映射到提到的jsp

Web.xml TeamName.java

---

我认为你应该返回

返回“Welcome”返回“Welcome.jsp”，因为mvc-dispatcher.xml已经为网页创建了后缀，在这种情况下为.jsp

为了进入您在浏览器localhost:8080/Welcome.jsp中输入的页面（当然，如果您使用的是本地主机serwer和端口8080）
@RequestMapping只有在dispatcher中存在相应的HandlerMapping（用于类型级注释）和/或HandlerAdapter（用于方法级注释）时才会被处理。默认情况下是这样。
您能详细说明一下吗？我是否在controller.javaI中丢失了任何内容？我做了以下更改，但未找到SAM错误页面：RequestMapping（value=“/Welcome”，method=RequestMethod.GET）public String showForm（映射模型）{return“Welcome”；}@RequestMapping（value=“/Welcome”，method=RequestMethod.POST）public String validateForm（@modeldattribute（“myUser”）@Valid TeamName myUser，BindingResult结果，映射模型）{if（result.hasErrors（））{返回“欢迎”；}在Jsp中：从错误判断，问题可能出在Jsp表单中
在Jsp:
->换句话说，操作应该在结尾用/Welcome指示您的一些网页谢谢您的回复！一个考虑因素，即使我尝试在服务器上运行Welcome.Jsp，它也返回状态：404。这与此有关吗控制器视图？为什么要尝试localhost:8080/HealthyCommunitySimulator/welcome.jsp？它没有映射，这就是为什么得到404，它应该像base（localhost:8080）+requestMapping from controller（在您的例子中是/welcome）=localhost:8080/welcome我现在在带有路径的上下文中得到Servlet[jsp]的以下错误：Servlet.service（）[/HealthyCommunitySimulator]引发异常[java.lang.IllegalStateException:bean名称“myUser”的BindingResult和普通目标对象都不能作为请求属性使用]使用根原因java.lang.IllegalStateException:BindingResult和bean名称“myUser”的普通目标对象都不能作为请求属性。您可以检查编译错误。还可以检查像Web.xml、Welcome.jsp这样的文件名的大小写。这些都应该是在所有小的情况下（Web.xml、Welcome.jsp）。没有编译错误，如下所示：java.lang.IllegalStateException:bean名称“myUser”的BindingResult和普通目标对象都不能作为请求属性使用。您看到的异常是因为缺少模型属性。您应该添加一个
model.put（“myUser”，new myUser（））；
在
GET
处理程序方法中，以便表单可以绑定到它。更改为：
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"  xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
<display-name>Archetype Created Web Application</display-name>
<context-param>  
<param-name>contextConfigLocation</param-name>  
<param-value>/WEB-INF/mvc-dispatcher-servlet.xml</param-value>  
</context-param> 
<listener>  
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>  
</listener> 
<listener>
<listener-lass>org.apache.tiles.extras.complete.CompleteAutoloadTilesListener
</listener-class>
</listener>
<servlet>  
<servlet-name>mvc-dispatcher</servlet-name>  
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>  
<load-on-startup>1</load-on-startup>  
</servlet> 
<servlet>
<servlet-name>Tiles Dispatch Servlet</servlet-name>
<servlet-class>org.apache.tiles.web.util.TilesDispatchServlet</servlet-class>
</servlet>
<servlet-mapping>  
<servlet-name>mvc-dispatcher</servlet-name>  
<url-pattern>/</url-pattern>  
</servlet-mapping>
<servlet-mapping>
<servlet-name>Tiles Dispatch Servlet</servlet-name>
<url-pattern>*.tiles</url-pattern>
</servlet-mapping>
<welcome-file-list> 
<welcome-file>/WEB-INF/pages/Welcome.jsp</welcome-file>
</welcome-file-list>
</web-app>

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"  
xmlns:context="http://www.springframework.org/schema/context"  
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"  
xmlns:mvc="http://www.springframework.org/schema/mvc"
xsi:schemaLocation="  
http://www.springframework.org/schema/beans       
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd  
http://www.springframework.org/schema/context   
http://www.springframework.org/schema/context/spring-context-3.0.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd">
<context:component-scan base-package="com.dev.controller" />  
<bean  
class="org.springframework.web.servlet.view.InternalResourceViewResolver">  
<property name="prefix">  
<value>/WEB-INF/pages/</value>  
</property>  
<property name="suffix">  
<value>.jsp</value>  
</property>  
</bean>  
</beans>

 <%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
    <%@ taglib uri="http://tiles.apache.org/tags-tiles" prefix="tiles" %>
    <%@taglib uri="http://www.springframework.org/tags" prefix="spring"%>
    <%@taglib uri="http://www.springframework.org/tags/form" prefix="form"%>
    <tiles:insertDefinition name="myapp.homepage" />
    <html>
    <head>
    </head>
    <body>
    <div id="welcomeTitle" class="title">
    <h1>Health Care Simulation - Welcome</h1>
    </div>
    <div id="centerBody" class="body">
    <form:form method="post" action="Welcome" modelAttribute="myUser">
    Enter Team Name:<font color="red"><form:errors path="teamName" /></font>
    <form:input path="teamName" />
    <input type="submit" value="Submit" />
    </form:form>
    </div>
    </body>
    </html>

@RequestMapping(value = "/welcome")
@Controller
public class WelcomeController {

    @ModelAttribute("myUser")

    public TeamName getLoginForm(@RequestParam String user) {
        System.out.println("test");
        TeamName myUser = new TeamName();
        myUser.setTeamName(user);
        return myUser;
    }

    @RequestMapping(method = RequestMethod.GET)
    public String showForm(@ModelAttribute("myUser") TeamName myUser)       
            /*Map model*/ {
        System.out.println("test1");
        //myUser.addAttribute("myUser",myUser ); 
        /*TeamName myUser = new TeamName();
        model.put("myUser", myUser);*/
        return "myUser";
    }
    @RequestMapping(method = RequestMethod.POST)
    public String validateForm(
        @ModelAttribute("myUser") @Valid TeamName myUser,
        BindingResult result, Map model) {
        System.out.println("test1");
        if (result.hasErrors()) {
            return "welcome";
        }

        model.put("myUser", myUser);

        return "success";

    }

}

import javax.validation.constraints.Size;
import org.hibernate.validator.constraints.NotEmpty;
public class TeamName {

    @NotEmpty
    @Size(min = 1, max = 20)
    private String teamName;

    public String getTeamName() {
        return teamName;
    }

    public void setTeamName(String teamName) {
        this.teamName = teamName;
    }
}