java.lang.IllegalStateException：BindingResult和bean名称'login'的普通目标对象都不作为请求属性

理论上，在单击submit之后，应该调用登录方法并检查用户的用户名和密码以进行匹配并重定向它们到另一个.jsp页面，但是当我尝试加载.jsp页面时，出现以下错误。java.lang.IllegalStateException：BindingResult和bean名称'login'的普通目标对象都不作为请求属性

我敢肯定，这个错误与我的.jsp文件有关，但我不确定会出现什么问题。

Jul 31, 2017 8:03:46 PM org.apache.catalina.core.StandardWrapperValve invoke 
SEVERE: Servlet.service() for servlet [jsp] in context with path [/Atomicity] threw exception [An exception occurred processing JSP page [/login.jsp] at line [20] 

17:     class="register-form"> 
18:     <table> 
19:      <tr> 
20:       <td><form:input path="username" /></td> 
21:       <td><form:errors path="username" /></td> 
22:      </tr> 
23:      <tr> 


Stacktrace:] with root cause 
java.lang.IllegalStateException: Neither BindingResult nor plain target object for bean name 'login' 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.login_jsp._jspx_meth_form_005finput_005f0(login_jsp.java:298) 
at org.apache.jsp.login_jsp._jspService(login_jsp.java:165) 
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70) 
at javax.servlet.http.HttpServlet.service(HttpServlet.java:741) 
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:443) 
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:385) 
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:329) 
at javax.servlet.http.HttpServlet.service(HttpServlet.java:741) 
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231) 
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) 
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) 
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) 
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) 
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:199) 
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) 
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:475) 
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140) 
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:80) 
at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:625) 
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87) 
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342) 
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:498) 
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66) 
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:796) 
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1372) 
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) 
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) 
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) 
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) 
at java.lang.Thread.run(Thread.java:745)

[Login.jsp页面]

<!DOCTYPE html> 
<html> 
<head> 
<meta charset="ISO-8859-1"> 
<%@ taglib prefix="spring" uri="http://www.springframework.org/tags"%> 
<%@ taglib prefix="form" uri="http://www.springframework.org/tags/form"%> 
<link rel="shortcut icon" href="favicon1.ico" /> 
<title>Login page</title> 
<link rel="stylesheet" href="css/normalize.css" /> 
<link rel="stylesheet" href="css/mystyle.css" /> 
</head> 
<body> 
<img id="logoImg2" src="img/atomicitylogo.png" alt="atomicity logo"> 
<div class="login-page"> 
    <div class="form"> 
     <form:form action="login" method="POST" commandName="login" 
      class="register-form"> 
      <table> 
       <tr> 
        <td><form:input path="username" /></td> 
        <td><form:errors path="username" /></td> 
       </tr> 
       <tr> 
        <td><form:input path="password" /></td> 
        <td><form:errors path="password" /></td> 
       </tr> 
       <tr> 
        <td colspan="2"><input type="submit" value="Log In" /> 
         <p class="message"> 
       </tr> 
      </table> 
      <p> 
       Not registered? <a href="register.html">Create an account</a> 
      </p> 
     </form:form> 
     </div> 
    </div> 
</body> 
</html>

[LoginComponent.java]

package com.atomicity.components; 

import javax.validation.constraints.NotNull; 

import org.springframework.stereotype.Component; 

@Component(value = "login") 
public class LoginComponent { 

@NotNull 
private String username; 
@NotNull 
private String password; 

public String getUsername() { 
    return username; 
} 

public void setUsername(String username) { 
    this.username = username; 
} 

public String getPassword() { 
    return password; 
} 

public void setPassword(String password) { 
    this.password = password; 
} 
}

[LoginController.java]

package com.atomicity.controllers; 

import javax.validation.Valid; 
import org.springframework.context.ApplicationContext; 
import org.springframework.context.support.AbstractApplicationContext; 
import org.springframework.context.support.ClassPathXmlApplicationContext; 
import org.springframework.stereotype.Controller; 
import org.springframework.ui.Model; 
import org.springframework.validation.BindingResult; 
import org.springframework.web.bind.annotation.ModelAttribute; 
import org.springframework.web.bind.annotation.RequestMapping; 
import org.springframework.web.bind.annotation.RequestMethod; 
import com.atomicity.components.LoginComponent; 
import com.atomicity.dao.UsersDAO; 
import com.atomicity.domain.Users; 

@Controller 
public class LoginController { 

@RequestMapping(value = "/loggingIn", method = RequestMethod.POST) 
public String login(@Valid @ModelAttribute("login") LoginComponent login, BindingResult br, Model m) { 
    ApplicationContext appCon = new ClassPathXmlApplicationContext("beans.xml"); 
    UsersDAO uDAO = (UsersDAO) appCon.getBean("usersDAO"); 
    Users user = uDAO.getUserByName(login.getUsername()); 

    if (user != null) { 
     // Check if password is correct 
     if (user.getPassword().equals(login.getPassword())) { 
      m.addAttribute("firstname", user.getFirstName()); 
      m.addAttribute("lastname", user.getLastName()); 
      m.addAttribute("email", user.getEmail()); 
      m.addAttribute("username", login.getUsername()); 
      ((AbstractApplicationContext) appCon).close(); 
      return "account"; 
     } else { 
      // Wrong Password 
     } 
    } else { 
     // User/Password does not exists 
    } 
    ((AbstractApplicationContext) appCon).close(); 
    return null; 
} 
}

任何帮助是值得欢迎的。

[编辑]删除login.jsp中的表格允许显示页面，所以我认为问题可能存在（或不）。

来源

2017-08-01 Christian Acosta

假设你参考这个[示例]（https://examples.javacodegeeks.com/enterprise-java/spring/mvc/spring-mvc-login-example /）在spring mvc登录表单上获取有关您错过的内容的想法。 –

java.lang.IllegalStateException: Neither BindingResult nor plain target object for bean name 'login' available as request attribute

看着堆栈跟踪它表明你没有通过登录对象的视图。因此，JSP不能正确渲染..

@GetMapping("/login") 
public String login(Model m) { 

    //Use model to expose the LoginComponent object 
    m.addAttribute("login", new LoginComponent()); 
    return "login"; 
}

你可以找到更详细的演练在这里：https://spring.io/guides/gs/handling-form-submission/

来源

2017-08-01 00:26:58

在页面加载之前出现异常。我没有看到该页面，我只是得到了异常。另外，我在控制器中没有GET请求方法。 –

基督徒，请尝试添加获取请求方法。让我知道如果这样的作品 –

我似乎有同样的问题 –

java.lang.IllegalStateException：BindingResult和bean名称'login'的普通目标对象都不作为请求属性

回答

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