我只是在学习Spring 3的注解fu，我偶然发现了newb的噩梦异常。将不胜感激。
这是表单jsp代码：
<form:form method="POST" action="login.htm" modelAttribute="login"> .... <form:input path="email" size="20" /> ....
控制器代码（此时，我只是在测试水域，因此不直接指向任何页面，仅返回一个空字符串）：
@Controller @SessionAttributes public class LoginController { @RequestMapping(value = "/login", method = RequestMethod.POST) public String login( @ModelAttribute("login") Login login, BindingResult result) { System.out.println(" email entered "+ login.getEmail()+ "\n"); return "test"; }
“登录”是具有适当的setter和getter的表单Bean。
我认为调度程序Servlet中的这段代码应注意注释扫描：
<context:component-scan base-package="com.testAnnFu.controller" />
这是当我尝试加载登陆jsp页面时引发的可耻异常。
SEVERE: Neither BindingResult nor plain target object for bean name 'login' available as request attribute 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: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.jsp.landing_jsp._jspx_meth_form_input_0(landing_jsp.java from :208) at org.apache.jsp.WEB_002dINF.jsp.landing_jsp._jspx_meth_form_form_0(landing_jsp.java from :164) at org.apache.jsp.WEB_002dINF.jsp.landing_jsp._jspService(landing_jsp.java from :107) 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.ApplicationDispatcher.doInvoke(ApplicationDispatcher.java:787) at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:649) at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:483) at org.apache.catalina.core.ApplicationDispatcher.doDispatch(ApplicationDispatcher.java:454) at org.apache.catalina.core.ApplicationDispatcher.dispatch(ApplicationDispatcher.java:350) at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:300) at org.springframework.web.servlet.view.InternalResourceView.renderMergedOutputModel(InternalResourceView.java:238) at org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:250) at org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1047) at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:817) at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:719) at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:669) at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:574) at javax.servlet.http.HttpServlet.service(HttpServlet.java:734) 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:680) WARNING: ApplicationDispatcher[/sssmgt] PWC1231: Servlet.service() for servlet jsp threw exception 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: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.jsp.landing_jsp._jspx_meth_form_input_0(landing_jsp.java from :208) at org.apache.jsp.WEB_002dINF.jsp.landing_jsp._jspx_meth_form_form_0(landing_jsp.java from :164) at org.apache.jsp.WEB_002dINF.jsp.landing_jsp._jspService(landing_jsp.java from :107) 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.ApplicationDispatcher.doInvoke(ApplicationDispatcher.java:787) at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:649) at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:483) at org.apache.catalina.core.ApplicationDispatcher.doDispatch(ApplicationDispatcher.java:454) at org.apache.catalina.core.ApplicationDispatcher.dispatch(ApplicationDispatcher.java:350) at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:300) at org.springframework.web.servlet.view.InternalResourceView.renderMergedOutputModel(InternalResourceView.java:238) at org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:250) at org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1047) at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:817) at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:719) at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:669) at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:574) at javax.servlet.http.HttpServlet.service(HttpServlet.java:734) 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:680) WARNING: StandardWrapperValve[dispatcher]: PWC1406: Servlet.service() for servlet dispatcher threw exception 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: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.jsp.landing_jsp._jspx_meth_form_input_0(landing_jsp.java from :208) at org.apache.jsp.WEB_002dINF.jsp.landing_jsp._jspx_meth_form_form_0(landing_jsp.java from :164) at org.apache.jsp.WEB_002dINF.jsp.landing_jsp._jspService(landing_jsp.java from :107) 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.ApplicationDispatcher.doInvoke(ApplicationDispatcher.java:787) at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:649) at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:483) at org.apache.catalina.core.ApplicationDispatcher.doDispatch(ApplicationDispatcher.java:454) at org.apache.catalina.core.ApplicationDispatcher.dispatch(ApplicationDispatcher.java:350) at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:300) at org.springframework.web.servlet.view.InternalResourceView.renderMergedOutputModel(InternalResourceView.java:238) at org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:250) at org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1047) at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:817) at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:719) at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:669) at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:574) at javax.servlet.http.HttpServlet.service(HttpServlet.java:734) 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:680)
我取消了 form：input 部分，并拥有一个裸露的jsp页面，该页面似乎已加载。只有当我介绍输入内容时，事情才会出错。
我知道我对整个注释内容如何连接并映射到ModelAttribute的理解存在严重错误。我翻遍了StOv中的所有组合和帖子，寻找类似的例外情况，但是我显然错过了一些东西。有人会在这里指出我的失误吗？
在控制器中，您需要添加登录对象作为模型的属性：
model.addAttribute("login", new Login());
像这样：
@RequestMapping(value = "/", method = RequestMethod.GET) public String displayLogin(Model model) { model.addAttribute("login", new Login()); return "login"; }
