Validation Spring表单验证-重复id引用

正如你们在下面的打印屏幕上看到的，我在Intellij 14.0中遇到了这样的错误。 我不知道怎么了

我确信问题是因为这句话是因为当我评论他们时，一切都很顺利。来自服务器的错误未提供任何有价值的信息

当我运行服务器并转到任何页面时，我出现以下错误：

type Exception report

message An exception occurred processing JSP page /WEB-INF/pages/index.jsp at line 44

description The server encountered an internal error that prevented it from fulfilling this request.

exception

org.apache.jasper.JasperException: An exception occurred processing JSP page /WEB-INF/pages/index.jsp at line 44

41:       </div>
42: 
43:       <div class="notetype">
44:         <form:form action="/addNoteType" modelAttribute="noteType">
45:           <div class="form-group">
46:             <label for="notetypeName">Name</label>
47:             <form:input path="name" id="notetypeName" class="form-control" placeholder="Enter NoteType Name" />


Stacktrace:
    org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:568)
    org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:460)
    org.apache.jasper.servlet.JspServlet._serviceJspFile(JspServlet.java:391)
    org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java)
    org.apache.jasper.servlet.JspServlet.service(JspServlet.java:335)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:725)
    org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
    org.springframework.web.servlet.view.InternalResourceView.renderMergedOutputModel(InternalResourceView.java:172)
    org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:303)
    org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1228)
    org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:1011)
    org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:955)
    org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:877)
    org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:966)
    org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:857)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:618)
    org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:842)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:725)
    org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
root cause

java.io.IOException: JspException when evaluating the body
    org.apache.tiles.request.jsp.autotag.JspModelBody.evaluate(JspModelBody.java:64)
    org.apache.tiles.autotag.core.runtime.AbstractModelBody.evaluateWithoutWriting(AbstractModelBody.java:77)
    org.apache.tiles.template.InsertDefinitionModel.execute(InsertDefinitionModel.java:97)
    org.apache.tiles.jsp.taglib.InsertDefinitionTag.doTag(InsertDefinitionTag.java:254)
    org.apache.jsp.WEB_002dINF.pages.index_jsp._jspService(index_jsp.java:104)
    org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:725)
    org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:432)
    org.apache.jasper.servlet.JspServlet._serviceJspFile(JspServlet.java:391)
    org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java)
    org.apache.jasper.servlet.JspServlet.service(JspServlet.java:335)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:725)
    org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
    org.springframework.web.servlet.view.InternalResourceView.renderMergedOutputModel(InternalResourceView.java:172)
    org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:303)
    org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1228)
    org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:1011)
    org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:955)
    org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:877)
    org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:966)
    org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:857)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:618)
    org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:842)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:725)
    org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
root cause

javax.servlet.jsp.JspException: java.io.IOException: JspException when evaluating the body
    org.apache.jsp.WEB_002dINF.pages.index_jsp$Helper.invoke(index_jsp.java:608)
    org.apache.tiles.request.jsp.autotag.JspModelBody.evaluate(JspModelBody.java:62)
    org.apache.tiles.autotag.core.runtime.AbstractModelBody.evaluateWithoutWriting(AbstractModelBody.java:77)
    org.apache.tiles.template.InsertDefinitionModel.execute(InsertDefinitionModel.java:97)
    org.apache.tiles.jsp.taglib.InsertDefinitionTag.doTag(InsertDefinitionTag.java:254)
    org.apache.jsp.WEB_002dINF.pages.index_jsp._jspService(index_jsp.java:104)
    org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:725)
    org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:432)
    org.apache.jasper.servlet.JspServlet._serviceJspFile(JspServlet.java:391)
    org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java)
    org.apache.jasper.servlet.JspServlet.service(JspServlet.java:335)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:725)
    org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
    org.springframework.web.servlet.view.InternalResourceView.renderMergedOutputModel(InternalResourceView.java:172)
    org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:303)
    org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1228)
    org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:1011)
    org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:955)
    org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:877)
    org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:966)
    org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:857)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:618)
    org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:842)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:725)
    org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
root cause

java.io.IOException: JspException when evaluating the body
    org.apache.tiles.request.jsp.autotag.JspModelBody.evaluate(JspModelBody.java:64)
    org.apache.tiles.autotag.core.runtime.AbstractModelBody.evaluateAsString(AbstractModelBody.java:59)
    org.apache.tiles.template.PutAttributeModel.execute(PutAttributeModel.java:96)
    org.apache.tiles.jsp.taglib.PutAttributeTag.doTag(PutAttributeTag.java:226)
    org.apache.jsp.WEB_002dINF.pages.index_jsp$Helper.invoke0(index_jsp.java:393)
    org.apache.jsp.WEB_002dINF.pages.index_jsp$Helper.invoke(index_jsp.java:594)
    org.apache.tiles.request.jsp.autotag.JspModelBody.evaluate(JspModelBody.java:62)
    org.apache.tiles.autotag.core.runtime.AbstractModelBody.evaluateWithoutWriting(AbstractModelBody.java:77)
    org.apache.tiles.template.InsertDefinitionModel.execute(InsertDefinitionModel.java:97)
    org.apache.tiles.jsp.taglib.InsertDefinitionTag.doTag(InsertDefinitionTag.java:254)
    org.apache.jsp.WEB_002dINF.pages.index_jsp._jspService(index_jsp.java:104)
    org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:725)
    org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:432)
    org.apache.jasper.servlet.JspServlet._serviceJspFile(JspServlet.java:391)
    org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java)
    org.apache.jasper.servlet.JspServlet.service(JspServlet.java:335)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:725)
    org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
    org.springframework.web.servlet.view.InternalResourceView.renderMergedOutputModel(InternalResourceView.java:172)
    org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:303)
    org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1228)
    org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:1011)
    org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:955)
    org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:877)
    org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:966)
    org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:857)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:618)
    org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:842)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:725)
    org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
root cause

javax.servlet.jsp.JspException: java.lang.IllegalStateException: Neither BindingResult nor plain target object for bean name 'notepad' available as request attribute
    org.apache.jsp.WEB_002dINF.pages.index_jsp$Helper.invoke(index_jsp.java:608)
    org.apache.tiles.request.jsp.autotag.JspModelBody.evaluate(JspModelBody.java:62)
    org.apache.tiles.autotag.core.runtime.AbstractModelBody.evaluateAsString(AbstractModelBody.java:59)
    org.apache.tiles.template.PutAttributeModel.execute(PutAttributeModel.java:96)
    org.apache.tiles.jsp.taglib.PutAttributeTag.doTag(PutAttributeTag.java:226)
    org.apache.jsp.WEB_002dINF.pages.index_jsp$Helper.invoke0(index_jsp.java:393)
    org.apache.jsp.WEB_002dINF.pages.index_jsp$Helper.invoke(index_jsp.java:594)
    org.apache.tiles.request.jsp.autotag.JspModelBody.evaluate(JspModelBody.java:62)
    org.apache.tiles.autotag.core.runtime.AbstractModelBody.evaluateWithoutWriting(AbstractModelBody.java:77)
    org.apache.tiles.template.InsertDefinitionModel.execute(InsertDefinitionModel.java:97)
    org.apache.tiles.jsp.taglib.InsertDefinitionTag.doTag(InsertDefinitionTag.java:254)
    org.apache.jsp.WEB_002dINF.pages.index_jsp._jspService(index_jsp.java:104)
    org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:725)
    org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:432)
    org.apache.jasper.servlet.JspServlet._serviceJspFile(JspServlet.java:391)
    org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java)
    org.apache.jasper.servlet.JspServlet.service(JspServlet.java:335)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:725)
    org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
    org.springframework.web.servlet.view.InternalResourceView.renderMergedOutputModel(InternalResourceView.java:172)
    org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:303)
    org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1228)
    org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:1011)
    org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:955)
    org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:877)
    org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:966)
    org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:857)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:618)
    org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:842)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:725)
    org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
root cause

java.lang.IllegalStateException: Neither BindingResult nor plain target object for bean name 'notepad' available as request attribute
    org.springframework.web.servlet.support.BindStatus.<init>(BindStatus.java:144)
    org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag.getBindStatus(AbstractDataBoundFormElementTag.java:168)
    org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag.getPropertyPath(AbstractDataBoundFormElementTag.java:188)
    org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag.getName(AbstractDataBoundFormElementTag.java:154)
    org.springframework.web.servlet.tags.form.AbstractDataBoundFormElementTag.writeDefaultAttributes(AbstractDataBoundFormElementTag.java:117)
    org.springframework.web.servlet.tags.form.AbstractHtmlElementTag.writeDefaultAttributes(AbstractHtmlElementTag.java:422)
    org.springframework.web.servlet.tags.form.InputTag.writeTagContent(InputTag.java:142)
    org.springframework.web.servlet.tags.form.AbstractFormTag.doStartTagInternal(AbstractFormTag.java:84)
    org.springframework.web.servlet.tags.RequestContextAwareTag.doStartTag(RequestContextAwareTag.java:80)
    org.apache.jsp.WEB_002dINF.pages.index_jsp._jspx_meth_form_005finput_005f0(index_jsp.java:224)
    org.apache.jsp.WEB_002dINF.pages.index_jsp.access$5(index_jsp.java:206)
    org.apache.jsp.WEB_002dINF.pages.index_jsp$Helper.invoke2(index_jsp.java:440)
    org.apache.jsp.WEB_002dINF.pages.index_jsp$Helper.invoke(index_jsp.java:600)
    org.apache.tiles.request.jsp.autotag.JspModelBody.evaluate(JspModelBody.java:62)
    org.apache.tiles.autotag.core.runtime.AbstractModelBody.evaluateAsString(AbstractModelBody.java:59)
    org.apache.tiles.template.PutAttributeModel.execute(PutAttributeModel.java:96)
    org.apache.tiles.jsp.taglib.PutAttributeTag.doTag(PutAttributeTag.java:226)
    org.apache.jsp.WEB_002dINF.pages.index_jsp$Helper.invoke0(index_jsp.java:393)
    org.apache.jsp.WEB_002dINF.pages.index_jsp$Helper.invoke(index_jsp.java:594)
    org.apache.tiles.request.jsp.autotag.JspModelBody.evaluate(JspModelBody.java:62)
    org.apache.tiles.autotag.core.runtime.AbstractModelBody.evaluateWithoutWriting(AbstractModelBody.java:77)
    org.apache.tiles.template.InsertDefinitionModel.execute(InsertDefinitionModel.java:97)
    org.apache.tiles.jsp.taglib.InsertDefinitionTag.doTag(InsertDefinitionTag.java:254)
    org.apache.jsp.WEB_002dINF.pages.index_jsp._jspService(index_jsp.java:104)
    org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:725)
    org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:432)
    org.apache.jasper.servlet.JspServlet._serviceJspFile(JspServlet.java:391)
    org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java)
    org.apache.jasper.servlet.JspServlet.service(JspServlet.java:335)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:725)
    org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
    org.springframework.web.servlet.view.InternalResourceView.renderMergedOutputModel(InternalResourceView.java:172)
    org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:303)
    org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1228)
    org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:1011)
    org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:955)
    org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:877)
    org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:966)
    org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:857)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:618)
    org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:842)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:725)
    org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
note The full stack trace of the root cause is available in the Apache Tomcat/8.0.12 logs.

类型异常报告
消息在第44行处理JSP page/WEB-INF/pages/index.JSP时发生异常
说明服务器遇到内部错误，无法满足此请求。
例外
org.apache.jasper.JasperException：处理第44行的JSP页面/WEB-INF/pages/index.JSP时发生异常
41:       
42: 
43:       
44:         
45:           
46:姓名
47:             
堆栈跟踪：
org.apache.jasper.servlet.JspServletWrapper.handleJspException（JspServletWrapper.java:568）
org.apache.jasper.servlet.JspServletWrapper.service（JspServletWrapper.java:460）
org.apache.jasper.servlet.JspServlet.\u serviceJspFile（JspServlet.java:391）
org.apache.jasper.servlet.JspServlet.serviceJspFile（JspServlet.java）
org.apache.jasper.servlet.JspServlet.service（JspServlet.java:335）
javaservlet.http.HttpServlet.service（HttpServlet.java:725）
org.apache.tomcat.websocket.server.WsFilter.doFilter（WsFilter.java:52）
org.springframework.web.servlet.view.InternalResourceView.renderMergedOutputModel（InternalResourceView.java:172）
org.springframework.web.servlet.view.AbstractView.render（AbstractView.java:303）
org.springframework.web.servlet.DispatcherServlet.render（DispatcherServlet.java:1228）
org.springframework.web.servlet.DispatcherServlet.processDispatchResult（DispatcherServlet.java:1011）
org.springframework.web.servlet.DispatcherServlet.doDispatch（DispatcherServlet.java:955）
org.springframework.web.servlet.DispatcherServlet.doService（DispatcherServlet.java:877）
org.springframework.web.servlet.FrameworkServlet.processRequest（FrameworkServlet.java:966）
org.springframework.web.servlet.FrameworkServlet.doGet（FrameworkServlet.java:857）
javaservlet.http.HttpServlet.service（HttpServlet.java:618）
org.springframework.web.servlet.FrameworkServlet.service（FrameworkServlet.java:842）
javaservlet.http.HttpServlet.service（HttpServlet.java:725）
org.apache.tomcat.websocket.server.WsFilter.doFilter（WsFilter.java:52）
根本原因
java.io.IOException:jspeexception在计算主体时
org.apache.tiles.request.jsp.autotag.JspModelBody.evaluate（JspModelBody.java:64）
org.apache.tiles.autotag.core.runtime.AbstractModelBody.EvaluateWithowWriting（AbstractModelBody.java:77）
org.apache.tiles.template.InsertDefinitionModel.execute（InsertDefinitionModel.java:97）
org.apache.tiles.jsp.taglib.InsertDefinitionTag.doTag（InsertDefinitionTag.java:254）
org.apache.jsp.WEB\u 002dINF.pages.index\u jsp.\u jsp服务（index\u jsp.java:104）
org.apache.jasper.runtime.HttpJspBase.service（HttpJspBase.java:70）
javaservlet.http.HttpServlet.service（HttpServlet.java:725）
org.apache.jasper.servlet.JspServletWrapper.service（JspServletWrapper.java:432）
org.apache.jasper.servlet.JspServlet.\u serviceJspFile（JspServlet.java:391）
org.apache.jasper.servlet.JspServlet.serviceJspFile（JspServlet.java）
org.apache.jasper.servlet.JspServlet.service（JspServlet.java:335）
javaservlet.http.HttpServlet.service（HttpServlet.java:725）
org.apache.tomcat.websocket.server.WsFilter.doFilter（WsFilter.java:52）
org.springframework.web.servlet.view.InternalResourceView.renderMergedOutputModel（InternalResourceView.java:172）
org.springframework.web.servlet.view.AbstractView.render（AbstractView.java:303）
org.springframework.web.servlet.DispatcherServlet.render（DispatcherServlet.java:1228）
org.springframework.web.servlet.DispatcherServlet.processDispatchResult（DispatcherServlet.java:1011）
org.springframework.web.servlet.DispatcherServlet.doDispatch（DispatcherServlet.java:955）
org.springframework.web.servlet.DispatcherServlet.doService（DispatcherServlet.java:877）
org.springframework.web.servlet.FrameworkServlet.processRequest（FrameworkServlet.java:966）
org.springframework.web.servlet.FrameworkServlet.doGet（FrameworkServlet.java:857）
javaservlet.http.HttpServlet.service（HttpServlet.java:618）
org.springframework.web.servlet.FrameworkServlet.service（FrameworkServlet.java:842）
javaservlet.http.HttpServlet.service（HttpServlet.java:725）
org.apache.tomcat.websocket.server.WsFilter.doFilter（WsFilter.java:52）
根本原因
javax.servlet.jsp.JspException:java.io.IOException:JspException评估主体时
org.apache.jsp.WEB_002dINF.pages.index_jsp$Helper.invoke（index_jsp.java:608）
org.apache.tiles.request.jsp.autotag.JspModelBody.evaluate（JspModelBody.java:62）
org.apache.tiles.autotag.core.runtime.AbstractModelBody.EvaluateWithowWriting（AbstractModelBody.java:77）
org.apache.tiles.template.InsertDefinitionModel.execute（InsertDefinitionModel.java:97）
org.apache.tiles.jsp.taglib.InsertDefinitionTag.doTag（InsertDefinitionTag.java:254）
org.apache.jsp.WEB\u 002dINF.pages.index\u jsp.\u jsp服务（index\u jsp.java:104）
org.apache.jasper.runtime.HttpJspBase.service（HttpJspBase.java:70）
javaservlet.http.HttpServlet.service（HttpServlet.java:725）
org.apache.jasper.servlet.JspServletWrapper.service（JspServletWrapper.java:432）
org.apache.jasper.servlet.JspServlet.\u serviceJspFile（JspServlet.java:391）
org.apache.jasper.servlet.JspServlet.serviceJspFile（JspServlet.java）
org.apache.jasper.servlet.JspServlet.service（JspServlet.java:335）
javaservlet.http.HttpServlet.service（HttpServlet.java:725）
org.apache.tomcat.websocket.server.WsFilter.doFilter（WsFilter.java:52）
org.springframework.web.servlet.view.InternalResourceView.renderMergedOutputModel（InternalResourceView.java:172）
org.springframework.web.servlet.view.AbstractView.render（Ab
<form:form method="post" modelAttribute="priceIncrease">
  <table width="95%" bgcolor="f8f8ff" border="0" cellspacing="0" cellpadding="5">
    <tr>
      <td align="right" width="20%">Increase (%):</td>
      <td width="20%">
        <form:input path="percentage"/>
      </td>
      <td width="60%">
        <form:errors path="percentage" cssClass="error"/>
      </td>
    </tr>
  </table>
  <br>
  <input type="submit" align="center" value="Execute">
</form:form>

    @RequestMapping(method = RequestMethod.GET)
    public String get(Model model) {
        PriceIncrease priceIncrease = new PriceIncrease();
        priceIncrease.setPercentage(20);
        model.addAttribute("priceIncrease", priceIncrease);
        return "priceincrease";
    }

    @RequestMapping(method = RequestMethod.POST)
    public String post(@Valid @ModelAttribute("priceIncrease") PriceIncrease priceIncrease, BindingResult result, Model model) {

        if (result.hasErrors()) {
            return "priceincrease";
        }

        int increase = priceIncrease.getPercentage();
        productManager.increasePrice(increase);

        return "redirect:home";
    }