環境：用SpringMVC Maven的Netbeans的Glassfish的錯誤用SpringMVC：既不BindingResult也不對豆名 '用戶' 可作爲請求屬性純目標對象
SEVERE: Neither BindingResult nor plain target object for bean name 'user' available as request attribute java.lang.IllegalStateException: Neither BindingResult nor plain target object for bean name 'user' available as request attribute at org.springframework.web.servlet.support.BindStatus.(BindStatus.java:141) at org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag.getBindStatus(AbstractDataBoundFormElementTag.java:178) at org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag.getPropertyPath(AbstractDataBoundFormElementTag.java:198) at org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag.getName(AbstractDataBoundFormElementTag.java:164) at org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag.autogenerateId(AbstractDataBoundFormElementTag.java:151) at org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag.resolveId(AbstractDataBoundFormElementTag.java:142) at org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag.writeDefaultAttributes(AbstractDataBoundFormElementTag.java:126) 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:102) at org.springframework.web.servlet.tags.RequestContextAwareTag.doStartTag(RequestContextAwareTag.java:79) at org.apache.jsp.user_jsp._jspx_meth_form_input_0(user_jsp.java:178) at org.apache.jsp.user_jsp._jspx_meth_form_form_0(user_jsp.java:120) at org.apache.jsp.user_jsp._jspService(user_jsp.java:76) at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:111) at javax.servlet.http.HttpServlet.service(HttpServlet.java:847) at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:403) at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:492) at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:378) at javax.servlet.http.HttpServlet.service(HttpServlet.java:847) at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1539) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:281) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175) at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:655) at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:595) at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:98) at com.sun.enterprise.web.PESessionLockingStandardPipeline.invoke(PESessionLockingStandardPipeline.java:91) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:162) at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:330) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:231) at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:174) at com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:828) at com.sun.grizzly.http.ProcessorTask.doProcess(ProcessorTask.java:725) at com.sun.grizzly.http.ProcessorTask.process(ProcessorTask.java:1019) at com.sun.grizzly.http.DefaultProtocolFilter.execute(DefaultProtocolFilter.java:225) at com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter(DefaultProtocolChain.java:137) at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:104) at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:90) at com.sun.grizzly.http.HttpProtocolChain.execute(HttpProtocolChain.java:79) at com.sun.grizzly.ProtocolChainContextTask.doCall(ProtocolChainContextTask.java:54) at com.sun.grizzly.SelectionKeyContextTask.call(SelectionKeyContextTask.java:59) at com.sun.grizzly.ContextTask.run(ContextTask.java:71) at com.sun.grizzly.util.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:532) at com.sun.grizzly.util.AbstractThreadPool$Worker.run(AbstractThreadPool.java:513) at java.lang.Thread.run(Thread.java:722)
user.jsp：
<form:form action="createuser.do" modelAttribute="user" method="POST">
<table align="center" >
<tr>
<td>User Name :</td>
<td><form:input path="userName"/></td>
</tr>
<tr>
<td><input type="submit" value="Submit" /></td>
</tr>
</table>
</form:form>
我的控制器：
@Controller
public class UserController {
@RequestMapping(value = "/createuser.do", method = RequestMethod.POST)
public void create(@ModelAttribute("user") User user, BindingResult result) {
System.out.print("user name: "+user.getUserName());
}
}
當我訪問「http：// localhost：8080/NBGFMN/use」時，瀏覽器出現此錯誤r.jsp」 java.lang.IllegalStateException：既不BindingResult也不對豆名‘用戶’可作爲請求屬性純目標對象
如果刪除form:input path="userName"）從JSP，在jsp顯示正確，當我點擊提交按鈕的控制檯輸出「用戶名：null」。
有這麼多帖子在stackoverflow關於這個相同的錯誤，但沒有解決方案爲我工作。
添加以下GET方法和的welcome.jsp
@RequestMapping(value = "/welcome.do", method = RequestMethod.GET)
public ModelAndView printHello()
{
ModelAndView m = new ModelAndView("welcome");
m.addObject("ppp", "hello");
return m;
}
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>JSP Page</title>
</head>
<body>
<c:out value="${ppp}" ></c:out>
</body>
</html>
，並獲得 「HTTP：//本地主機：8080/NBGFMN/welcome.do」 它完美。
我添加以下GET（創建一個用戶），它的工作原理：
@RequestMapping(value = "/createuser.do", method = RequestMethod.GET)
public String create(ModelMap mm)
{
mm.addAttribute("auser", new User("Andy"));
return "welcome";
}
<body>
<c:out value="${auser.userName}" ></c:out>
</body>
我訪問的 「http：//本地主機：8080/NBGFMN/createuser.do」，瀏覽器的輸出 「安迪」
但表單POST仍然不起作用。
你可以添加'GET'handler嗎？您是在那裏添加模型屬性還是通過'@ModelAttribute（「user」）'註釋的方法？ – Wolfram 2012-07-20 13:43:06
嗨，我添加了下面的GET方法和welcome.jsp，它完美的工作。至於@ModelAttribute（「用戶」），是的，我擁有它。我在網上谷歌這個錯誤信息，看到所有人都說，但它不適合我。我試過SpringMVC-3.0.7和最新的3.1.2，仍然沒有工作 – wlin 2012-07-20 13:50:33