Bean 名称 spring mvc 的 BindingResult 和普通目标对象都不是

【问题标题】：Neither BindingResult nor plain target object for bean name spring mvcBean 名称 spring mvc 的 BindingResult 和普通目标对象都不是
【发布时间】：2015-04-03 06:38:59
【问题描述】：

我的小项目有问题。

这是我的控制器

@Controller
@RequestMapping( "/loginPage" )
public class LoginController
{
private static final String VN_LOGIN_FORM      = "login/LoginForm";
private static final String VN_HOME_FORM       = "redirect:../home.html";
String VN_LOGIN_FAIL_FROM = "redirect:../loginPage /login.html";

//   @Autowired
private AccountService      act;

private EmployeeService     em;

@RequestMapping( value = "login", method = RequestMethod.GET )
public String getRegistrationForm( Model model )
{
    model.addAttribute( "user", new AccountForm( ) );
    return VN_LOGIN_FORM;
}

@RequestMapping( value = "", method = RequestMethod.POST )
public String postRegistrationForm( @ModelAttribute( "user" ) AccountForm form )
{
    Account temp = toAccount( form );
    Account found = act.getAccount( temp.getUsername( ) );
    java.util.List<Employee> list = em.getNewEmployees( );

    if ( found != null && found.getPassword( ).equals( temp.getPassword( ) ) )
    {
        return VN_HOME_FORM;
    }
    return VN_LOGIN_FAIL_FROM;

}

@InitBinder
public void initBinder( WebDataBinder binder )
{
    binder.setAllowedFields( new String[ ] { "username", "password", "confirmPassword", "firstName", "lastName", "email",
            "marketingOk", "acceptTerms" } );
}

private static Account toAccount( AccountForm form )
{
    Account account = new Account( );
    account.setUsername( form.getUsername( ) );
    account.setPassword( form.getPassword( ) );
    return account;
}

}

这是我的 jps 页面。

    <form:form action="." modelAttribute="user" method="POST"
    class="login">
    <form:errors path="*">
        <div class="warning alert">
            <spring:message code="error.global" />
        </div>
    </form:errors>
    <div>
        <label for="username">${username}</label>
        <form:input name="username" id="login" path="username"
            cssErrorClass="short error" value="username" />
    </div>
    <br>
    <div>
        <label for="password">${password}</label>
        <form:password path="password" name="password" value="1111111111" />
    </div>
    <div class="login-submit">
        <button type="submit" value="" class="login-button">Submit</button>
    </div>
    <br>
    <div class="forgot-password">
        <button type="submit" class="btn-reset">Forgot your
            password?</button>
        <button type="submit" class="btn-reset">Reset</button>
    </div>
</form:form>

这是异常跟踪：

09:31:49,069 ERROR [org.springframework.web.servlet.tags.form.InputTag] (http-localhost-127.0.0.1-8080-1) 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.<init>(BindStatus.java:141) [spring-webmvc-3.1.0.RELEASE.jar:3.1.0.RELEASE]
at org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag.getBindStatus(AbstractDataBoundFormElementTag.java:178) [spring-webmvc-3.1.0.RELEASE.jar:3.1.0.RELEASE]
at org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag.getPropertyPath(AbstractDataBoundFormElementTag.java:198) [spring-webmvc-3.1.0.RELEASE.jar:3.1.0.RELEASE]
at org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag.getName(AbstractDataBoundFormElementTag.java:164) [spring-webmvc-3.1.0.RELEASE.jar:3.1.0.RELEASE]
at org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag.writeDefaultAttributes(AbstractDataBoundFormElementTag.java:127) [spring-webmvc-3.1.0.RELEASE.jar:3.1.0.RELEASE]
at org.springframework.web.servlet.tags.form.AbstractHtmlElementTag.writeDefaultAttributes(AbstractHtmlElementTag.java:421) [spring-webmvc-3.1.0.RELEASE.jar:3.1.0.RELEASE]
at org.springframework.web.servlet.tags.form.InputTag.writeTagContent(InputTag.java:142) [spring-webmvc-3.1.0.RELEASE.jar:3.1.0.RELEASE]
at org.springframework.web.servlet.tags.form.AbstractFormTag.doStartTagInternal(AbstractFormTag.java:102) [spring-webmvc-3.1.0.RELEASE.jar:3.1.0.RELEASE]
at org.springframework.web.servlet.tags.RequestContextAwareTag.doStartTag(RequestContextAwareTag.java:79) [spring-webmvc-3.1.0.RELEASE.jar:3.1.0.RELEASE]
at org.apache.jsp.WEB_002dINF.views.login.LoginForm_jsp._jspx_meth_form_005finput_005f0(LoginForm_jsp.java:364)
at org.apache.jsp.WEB_002dINF.views.login.LoginForm_jsp._jspService(LoginForm_jsp.java:174)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70) [jbossweb-7.0.13.Final.jar:]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:847) [jboss-servlet-api_3.0_spec-1.0.0.Final.jar:1.0.0.Final]
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:369) [jbossweb-7.0.13.Final.jar:]
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:326) [jbossweb-7.0.13.Final.jar:]
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:253) [jbossweb-7.0.13.Final.jar:]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:847) [jboss-servlet-api_3.0_spec-1.0.0.Final.jar:1.0.0.Final]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:329) [jbossweb-7.0.13.Final.jar:]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:248) [jbossweb-7.0.13.Final.jar:]
at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:840) [jbossweb-7.0.13.Final.jar:]
at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:622) [jbossweb-7.0.13.Final.jar:]
at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:560) [jbossweb-7.0.13.Final.jar:]
at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:488) [jbossweb-7.0.13.Final.jar:]
at org.springframework.web.servlet.view.InternalResourceView.renderMergedOutputModel(InternalResourceView.java:238) [spring-webmvc-3.1.0.RELEASE.jar:3.1.0.RELEASE]
at org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:262) [spring-webmvc-3.1.0.RELEASE.jar:3.1.0.RELEASE]
at org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1157) [spring-webmvc-3.1.0.RELEASE.jar:3.1.0.RELEASE]
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:927) [spring-webmvc-3.1.0.RELEASE.jar:3.1.0.RELEASE]
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:827) [spring-webmvc-3.1.0.RELEASE.jar:3.1.0.RELEASE]
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:882) [spring-webmvc-3.1.0.RELEASE.jar:3.1.0.RELEASE]
at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:778) [spring-webmvc-3.1.0.RELEASE.jar:3.1.0.RELEASE]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:734) [jboss-servlet-api_3.0_spec-1.0.0.Final.jar:1.0.0.Final]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:847) [jboss-servlet-api_3.0_spec-1.0.0.Final.jar:1.0.0.Final]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:329) [jbossweb-7.0.13.Final.jar:]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:248) [jbossweb-7.0.13.Final.jar:]
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:275) [jbossweb-7.0.13.Final.jar:]
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:161) [jbossweb-7.0.13.Final.jar:]
at org.jboss.as.web.security.SecurityContextAssociationValve.invoke(SecurityContextAssociationValve.java:153) [jboss-as-web-7.1.1.Final.jar:7.1.1.Final]
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:155) [jbossweb-7.0.13.Final.jar:]
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) [jbossweb-7.0.13.Final.jar:]
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) [jbossweb-7.0.13.Final.jar:]
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:368) [jbossweb-7.0.13.Final.jar:]
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:877) [jbossweb-7.0.13.Final.jar:]
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:671) [jbossweb-7.0.13.Final.jar:]
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:930) [jbossweb-7.0.13.Final.jar:]
at java.lang.Thread.run(Thread.java:745) [rt.jar:1.7.0_71]

这是来自我的 beans-web.xml 的信息

<mvc:view-controller path="/loginPage/login.html" view-name="login/LoginForm" />

我如何访问该页面：

http://localhost:8080/spring-mvc/loginPage/login.html

我不明白问题出在哪里。

【问题讨论】：

标签： java jsp spring-mvc


【解决方案1】：

看起来您在beans-web.xml 中只配置了&lt;mvc:view-controller&gt;。为了让 spring 注入用户对象，控制器也需要被扫描。注册控制器和处理程序映射需要以下标签。如果您已配置以下内容，请在您的 OP 中发布您的完整配置。

<mvc:annotation-driven/>
<context:component-scan base-package="you controller package goes here" />

如果您的调度程序 servlet 设置为处理 *.html，那么您不需要 &lt;mvc:view-controller&gt;。简单地通过控制器应该可以解决您的问题。

【讨论】：

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