Java.lang.IllegalStateException：Bean name“loginBean”的BindingResult和普通目标对象都不能用作请求属性

时间：2015-02-19 21:40:55

标签： java spring jsp spring-mvc servlets

每当我在index.jsp文件中使用Spring表单标记库时，我都会收到以下错误。如果我使用HTML标记，表单工作正常。我正在使用Eclipse Kepler，Spring 4.1.1 Release和Tomcat 7.以前的问题指出需要将对象模型绑定到.jsp页面，我相信我已经在控制器中完成了。之前的问题也指出了命名约定中的错误，我认为在这种情况下这不是问题。有什么想法吗？

这是堆栈跟踪：

  

SEVERE：带有路径[/ TrackRecord]的上下文中servlet [jsp]的Servlet.service（）抛出异常[java.lang.IllegalStateException：BindingResult和bean名称'loginBean'的普通目标对象都不可用作请求属性]根本原因

     

java.lang.IllegalStateException：BindingResult和bean名称“loginBean”的普通目标对象都不能用作请求属性   在org.springframework.web.servlet.support.BindStatus。（BindStatus.java:144）       在org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag.getBindStatus（AbstractDataBoundFormElementTag.java:168）       在org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag.getPropertyPath（AbstractDataBoundFormElementTag.java:188）       在org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag.getName（AbstractDataBoundFormElementTag.java:154）       at org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag.autogenerateId（AbstractDataBoundFormElementTag.java:141）       在org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag.resolveId（AbstractDataBoundFormElementTag.java:132）       在org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag.writeDefaultAttributes（AbstractDataBoundFormElementTag.java:116）       在org.springframework.web.servlet.tags.form.AbstractHtmlElementTag.writeDefaultAttributes（AbstractHtmlElementTag.java:422）       在org.springframework.web.servlet.tags.form.InputTag.writeTagContent（InputTag.java:142）       在org.springframework.web.servlet.tags.form.AbstractFormTag.doStartTagInternal（AbstractFormTag.java:84）       在org.springframework.web.servlet.tags.RequestContextAwareTag.doStartTag（RequestContextAwareTag.java:80）

LoginBean.java 

public class LoginBean {

/**
 * default constructor
 */
public LoginBean() {

}
/**
 * constructor
 * @param username
 * @param password
 */
public LoginBean(String username, String password){

}

@Size(min=1, message= "username is required.")
private String username;

@Size(min=1, message= "password is required.")
private String password;

public boolean validate() {
    if (username == null || username.equals("")) {
        return false;
    }

    if (password == null || password.equals("")) {
        return false;
    }
    return true;
}
}

LoginController.java 

@Controller
public class LoginController {

    @RequestMapping(value = "/login", method = RequestMethod.GET)
    public String login(ModelAndView model) {
        model.addObject("loginBean", new LoginBean());
        System.out.println("LoginBean created!");
        return "login";
    }

    @RequestMapping(value = "/addlogin", method = RequestMethod.POST)
    public String addLogin(@ModelAttribute("loginBean") @Valid LoginBean login, BindingResult result, Model model) {
        EmployeeBean employee = (new LoginManager()).authenticate(ILoginService.NAME, login);
        System.out.println("Controller employee = " +  employee);

        if (result.hasErrors()) {
            return "loginerror";
        }

        if (employee.getID() == 0) {
            return "loginerror";
        } else {
            model.addAttribute("employee", employee);
            return "home";
        }
    }
}

的Login.jsp 

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<%@ taglib uri="http://www.springframework.org/tags/form" prefix="form"  %>
<%@ taglib prefix="myTags" tagdir="/WEB-INF/tags" %>

<html>
<head>
</head>
<body>

    <h3>Welcome, Enter Login</h3>

<form:form method="POST" action="addlogin" modelAttribute="loginBean">

Username
<form:input path="username" cssClass="input"/>
<form:errors path="username" cssClass="error"/>
Password
<form:input path="password" cssClass="input"/>
<form:errors path="password" cssClass="error"/>
<input type="submit" value="Submit"/></td>
</form:form>

</body>

</html>

弹簧servlet.xml中

<?xml version="1.0" encoding="UTF-8"?>

<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="
       http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.1.xsd
       http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.1.xsd
       http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.1.xsd">


<!-- Enables the Spring MVC @Controller programming model -->

<mvc:annotation-driven />

<!-- the application context definition for the spring DispatcherServlet -->

<context:component-scan base-package="springcontroller" /> 

<mvc:default-servlet-handler/>

<bean class="org.springframework.web.servlet.mvc.support.ControllerClassNameHandlerMapping"/> 

<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
    <property name="prefix" value="/WEB-INF/jsp/" />
    <property name="suffix" value=".jsp" />
</bean>

<bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
    <property name="webBindingInitializer">
        <!-- Configures Spring MVC DataBinder instances -->
        <bean class="org.springframework.web.bind.support.ConfigurableWebBindingInitializer">
               <property name="validator" ref="validator" />
        </bean>
    </property>
</bean>

<!-- Creates the JSR-303 Validator -->
<bean id="validator"
    class="org.springframework.validation.beanvalidation.LocalValidatorFactoryBean" />

</beans>

的web.xml 

<?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" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" version="2.5">

<display-name>TrackRecord web app</display-name>

<welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
</welcome-file-list>

<filter>
    <filter-name>LoginFilter</filter-name>
    <filter-class>filters.LoginTrackingFilter</filter-class>
</filter>

<filter-mapping>
    <filter-name>LoginFilter</filter-name>
    <url-pattern>/addlogin</url-pattern>
</filter-mapping>


<servlet>
    <servlet-name>spring</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>

<servlet-mapping>
    <servlet-name>spring</servlet-name>
    <url-pattern>/</url-pattern>
</servlet-mapping>

<listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>

<context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>/WEB-INF/spring-servlet.xml</param-value>
</context-param>

<env-entry>
    <env-entry-name>IAddVinylService</env-entry-name>
    <env-entry-type>java.lang.String</env-entry-type>
    <env-entry-value>dao.jdbc.AddVinylServiceJDBCImpl</env-entry-value>
</env-entry>

<env-entry>
    <env-entry-name>ILoginService</env-entry-name>
    <env-entry-type>java.lang.String</env-entry-type>
    <env-entry-value>dao.jdbc.LoginServiceJDBCImpl</env-entry-value>
</env-entry>

<env-entry>
    <env-entry-name>ISearchVinylService</env-entry-name>
    <env-entry-type>java.lang.String</env-entry-type>
    <env-entry-value>dao.jdbc.SearchVinylServiceJDBCImpl</env-entry-value>
</env-entry>

<env-entry>
    <env-entry-name>IDeleteVinylService</env-entry-name>
    <env-entry-type>java.lang.String</env-entry-type>
    <env-entry-value>dao.jdbc.DeleteVinylServiceJDBCImpl</env-entry-value>
</env-entry>

<env-entry>
    <env-entry-name>ApplicationPropertiesXML</env-entry-name>
    <env-entry-type>java.lang.String</env-entry-type>
    <env-entry-value>ApplicationProperties.xml</env-entry-value>
</env-entry>

<env-entry>
    <env-entry-name>ApplicationPropertiesXSD</env-entry-name>
    <env-entry-type>java.lang.String</env-entry-type>
    <env-entry-value>ApplicationProperties.XSD</env-entry-value>
</env-entry>

<resource-ref>
    <description>DB Connection</description>
    <res-ref-name>jdbc/aaa</res-ref-name>
    <res-type>javax.sql.DataSource</res-type>
    <res-auth>Container</res-auth>
</resource-ref>

</web-app>

0 个答案:

没有答案
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