BindingResult和bean名稱'contact'的普通目標對象都不作爲請求屬性

我試圖用spring mvc + maven + jpa hibernate創建一個簡單的項目。BindingResult和bean名稱'contact'的普通目標對象都不作爲請求屬性

我的JSP頁面：

<%@taglib uri="http://www.springframework.org/tags" prefix="spring"%> 
<%@taglib uri="http://www.springframework.org/tags/form" prefix="form"%> 
<%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%> 

<div> 
<form:form action="contact.html" method="post" commandName="contact" > 

<div> 
<label for="firstname">First Name</label> 
<form:input path="firstname"/> 
<form:errors path="firstname" cssClass="error"/> 
</div> 

<div> 
<label for="lastname">Last Name</label> 
<form:input path="lastname"/> 
<form:errors path="lastname" cssClass="error"/> 
</div> 

<div> 
<label for="telephone">Telephone</label> 
<form:input path="telephone"/> 
<form:errors path="telephone" cssClass="error"/> 
</div> 

<div> 
<label for="email">Email</label> 
<form:input path="email"/> 
<form:errors path="email" cssClass="error"/> 
</div> 

<div> 
<form:button name="submit" value="submit">Add Contact</form:button> 
</div>

我contact.html控制器：

package com.corasent.contacts.controllers; 

import javax.servlet.http.HttpServletRequest; 

import org.springframework.beans.factory.annotation.Autowired; 

import org.springframework.stereotype.Controller; 
import org.springframework.ui.ModelMap; 
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 org.springframework.web.servlet.ModelAndView; 

import com.corasent.contacts.form.Contact; 
import com.corasent.contacts.service.ContactService; 

@Controller 
@RequestMapping("contact.html") 
public class ContactManagerController { 


@Autowired 
ContactService cs; 

@RequestMapping(method = RequestMethod.GET) 
public String contactController() 
{ 
    System.out.println("In controller"); 
    ModelMap map=new ModelMap(); 
    Contact contact=new Contact(); 
    map.addAttribute("contact", contact); 
    return "contacts"; 
} 

@RequestMapping(method=RequestMethod.POST) 
public ModelAndView getInfo(@ModelAttribute Contact contact, BindingResult result, HttpServletRequest req) 
{ 
    ModelAndView mv=new ModelAndView("contacts"); 
    String name=contact.getFirstname(); 
    System.out.println("name is="+name); 
    cs.validate(contact, result); 
    if(result.hasErrors()) 
    { 

     return mv ; 
    } 

    System.out.println("in post method"); 
    return mv; 


} 

public ContactService getCs() { 
    return cs; 
} 

public void setCs(ContactService cs) { 
    this.cs = cs; 
}

}

我知道命令名以J sp是必須傳遞給控制器的bean。同一個bean在控制器中啓動，但似乎不起作用。它給了我上面的錯誤。我也在粘貼stackTrace。

ERROR: org.springframework.web.servlet.tags.form.InputTag - Neither BindingResult nor  plain target object for bean name 'contact' available as request attribute 
java.lang.IllegalStateException: Neither BindingResult nor plain target object for bean name 'contact' available as request attribute 
at org.springframework.web.servlet.support.BindStatus.<init>(BindStatus.java:141) 
at org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag.getBindStatus(AbstractDataBoundFormElementTag.java:179) 
at org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag.getPropertyPath(AbstractDataBoundFormElementTag.java:199) 
at org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag.getName(AbstractDataBoundFormElementTag.java:165) 
at org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag.autogenerateId(AbstractDataBoundFormElementTag.java:152) 
at org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag.resolveId(AbstractDataBoundFormElementTag.java:143) 
at org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag.writeDefaultAttributes(AbstractDataBoundFormElementTag.java:127) 
at org.springframework.web.servlet.tags.form.AbstractHtmlElementTag.writeDefaultAttributes(AbstractHtmlElementTag.java:421) 
at org.springframework.web.servlet.tags.form.InputTag.writeTagContent(InputTag.java:142) 
at org.springframework.web.servlet.tags.form.AbstractFormTag.doStartTagInternal(AbstractFormTag.java:103) 
at org.springframework.web.servlet.tags.RequestContextAwareTag.doStartTag(RequestContextAwareTag.java:80) 
at org.apache.jsp.WEB_002dINF.views.jsp.contacts_jsp._jspx_meth_form_005finput_005f0(contacts_jsp.java:272) 
at org.apache.jsp.WEB_002dINF.views.jsp.contacts_jsp._jspService(contacts_jsp.java:100) 
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70) 
at javax.servlet.http.HttpServlet.service(HttpServlet.java:722) 
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:432) 
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390) 
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334) 
at javax.servlet.http.HttpServlet.service(HttpServlet.java:722) 
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305) 
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) 
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222) 
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123) 
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472) 
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168) 
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99) 
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:929) 
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118) 
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407) 
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1002) 
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:585) 
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:310) 
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1146) 
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) 
at java.lang.Thread.run(Thread.java:679) 
12 Apr, 2013 12:36:53 PM org.apache.catalina.core.StandardWrapperValve invoke 
SEVERE: Servlet.service() for servlet [jsp] in context with path [/contacts] threw  exception [An exception occurred processing JSP page /WEB-INF/views/jsp/contacts.jsp at line 10 

7: 
8: <div> 
9: <label for="firstname">First Name</label> 
10: <form:input path="firstname"/> 
11: <form:errors path="firstname" cssClass="error"/> 
12: </div>

在此先感謝

來源

2013-04-12 Sandhya

嘗試用：

@RequestMapping(method = RequestMethod.GET) 
public String contactController(Model model) 
{ 
    System.out.println("In controller"); 
    // ModelMap map=new ModelMap(); 
    Contact contact=new Contact(); 
    model.addAttribute("contact", contact); 
    return "contacts"; 
}

在代碼中，你要創建一個ModelMap，但由於是在方法的最後被破壞了也沒用。將模型作爲參數傳遞，spring將稍後使用它來填充您的JSP。

你有一個例子here。

來源

2013-04-12 08:12:16 jelies

謝謝@jelies ..但我添加它作爲參數後收到相同的錯誤。 – Sandhya

嘗試將參數的名稱更改爲'model'（請參閱更新）。有時候春天對此非常嚴格。 – jelies

是的，我確實改變它的模型，但沒有運氣。 – Sandhya

嘗試是這樣的：

@RequestMapping(method = RequestMethod.GET) 
public ModelAndView contactController() 
{ 
    System.out.println("In controller"); 
    // First attribute is view name, second model name and last model object 
    return new ModelAndView("contacts","contact", new Contact()); 
}

此外，在您的形式，我會通過modelAttribute改變屬性commandName，我想我已經讀到第一個是一種過時（不完全信任我這裏）

來源

2013-04-12 12:38:12 Dani

BindingResult和bean名稱'contact'的普通目標對象都不作爲請求屬性

回答

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