Spring MVC 3：java.lang.IllegalStateException
你好 有人可以帮助我理解我在以下代码中做错了什么，导致我收到此错误：
Caused by: java.lang.IllegalStateException: Neither BindingResult nor plain target object for bean name 'user' 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:174)
at org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag.getPropertyPath(AbstractDataBoundFormElementTag.java:194)
at org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag.getName(AbstractDataBoundFormElementTag.java:160)
at org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag.autogenerateId(AbstractDataBoundFormElementTag.java:147)
at org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag.resolveId(AbstractDataBoundFormElementTag.java:138)
at org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag.writeDefaultAttributes(AbstractDataBoundFormElementTag.java:122)
at org.springframework.web.servlet.tags.form.AbstractHtmlElementTag.writeDefaultAttributes(AbstractHtmlElementTag.java:408)
at org.springframework.web.servlet.tags.form.InputTag.writeTagContent(InputTag.java:140)
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.WEB_002dINF.views.signUp_jsp._jspx_meth_form_005finput_005f0(signUp_jsp.java:179)
at org.apache.jsp.WEB_002dINF.views.signUp_jsp._jspx_meth_form_005fform_005f0(signUp_jsp.java:111)
at org.apache.jsp.WEB_002dINF.views.signUp_jsp._jspService(signUp_jsp.java:74)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:374)
... 59 more
UserManagementController.java
@Controller
public class UserManagementController {
//displays sign up page(GET)
@RequestMapping(method=RequestMethod.GET, value="/signUp.html")
public ModelAndView signUpForm() {
System.out.println("Sign up");
return new ModelAndView("/signUp", "user", new User());
}
}
signUp.jsp
<body>
<h3>Sign up</h3>
<table>
<form:form commandName="user" >
<tr>
<td>First name:</td>
<td><form:input path="firstName"/></td>
</tr>
<tr>
<td>Last name:</td>
<td><form:input path="lastName"/></td>
</tr>
<tr>
<td>Username:</td>
<td><form:input path="username"/></td>
</tr>
<tr>
<td>Password:</td>
<td><form:input path="password"/></td>
</tr>
<tr>
<td>Email:</td>
<td><form:input path="email"/></td>
</tr>
<tr>
<td></td>
<td><input type="submit" value="Submit"></td>
</tr>
</form:form>
</table>
</body>
有人可以帮助我理解它吗？
谢谢。
Hi
Could someone help me understand what am I doing wrong in the following code due to which I am getting this error:
Caused by: java.lang.IllegalStateException: Neither BindingResult nor plain target object for bean name 'user' 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:174)
at org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag.getPropertyPath(AbstractDataBoundFormElementTag.java:194)
at org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag.getName(AbstractDataBoundFormElementTag.java:160)
at org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag.autogenerateId(AbstractDataBoundFormElementTag.java:147)
at org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag.resolveId(AbstractDataBoundFormElementTag.java:138)
at org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag.writeDefaultAttributes(AbstractDataBoundFormElementTag.java:122)
at org.springframework.web.servlet.tags.form.AbstractHtmlElementTag.writeDefaultAttributes(AbstractHtmlElementTag.java:408)
at org.springframework.web.servlet.tags.form.InputTag.writeTagContent(InputTag.java:140)
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.WEB_002dINF.views.signUp_jsp._jspx_meth_form_005finput_005f0(signUp_jsp.java:179)
at org.apache.jsp.WEB_002dINF.views.signUp_jsp._jspx_meth_form_005fform_005f0(signUp_jsp.java:111)
at org.apache.jsp.WEB_002dINF.views.signUp_jsp._jspService(signUp_jsp.java:74)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:374)
... 59 more
UserManagementController.java
@Controller
public class UserManagementController {
//displays sign up page(GET)
@RequestMapping(method=RequestMethod.GET, value="/signUp.html")
public ModelAndView signUpForm() {
System.out.println("Sign up");
return new ModelAndView("/signUp", "user", new User());
}
}
signUp.jsp
<body>
<h3>Sign up</h3>
<table>
<form:form commandName="user" >
<tr>
<td>First name:</td>
<td><form:input path="firstName"/></td>
</tr>
<tr>
<td>Last name:</td>
<td><form:input path="lastName"/></td>
</tr>
<tr>
<td>Username:</td>
<td><form:input path="username"/></td>
</tr>
<tr>
<td>Password:</td>
<td><form:input path="password"/></td>
</tr>
<tr>
<td>Email:</td>
<td><form:input path="email"/></td>
</tr>
<tr>
<td></td>
<td><input type="submit" value="Submit"></td>
</tr>
</form:form>
</table>
</body>
Could someone help me understand it?
Thanks.
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评论（1）
我错误地使用了
ModelAndView的错误导入。我本来应该使用 org.springframework.web.servlet.ModelAndView，但我错误地使用了 org.springframework.web.portlet.ModelAndView。
我现在已经可以使用代码了。
谢谢 ：）
I was mistakenly using the wrong import for
ModelAndView.I was supposed to use
org.springframework.web.servlet.ModelAndViewbut the one I was mistakenly using wasorg.springframework.web.portlet.ModelAndView.I've got the code working now.
Thanks :)