org.apache.jasper.JasperException：表達式參數名在模板/ simple/select.ftl的第85行第85行中是未定義的。

Question

我在struts-2中使用<s:select>，但使用multiple="true"，但它給出了一個例外。如果我刪除multiple="true"那麼它運行良好。我無法理解錯誤。

我的JSP頁面：

<div id="form" style="text-align: center;"> 

       <s:select id="list" size="3" multiple="true" list="{'Jan', 'Feb', 'Mar', 'Apr'}"></s:select> 
       <button id="submit" type="submit">Submit</button> 
      </div> 

的例外是：

org.apache.jasper.JasperException: Expression parameters.name is undefined on line 92, column 85 in template/simple/select.ftl. - Class: freemarker.core.TemplateObject 
File: TemplateObject.java 
Method: assertNonNull 
Line: 124 - freemarker/core/TemplateObject.java:124:-1 
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:585) 
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:470) 
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390) 
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334) 
javax.servlet.http.HttpServlet.service(HttpServlet.java:728) 
org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:393) 
org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:88) 
root cause 
Expression parameters.name is undefined on line 92, column 85 in template/simple/select.ftl. - Class: freemarker.core.TemplateObject 
File: TemplateObject.java 
Method: assertNonNull 
Line: 124 - freemarker/core/TemplateObject.java:124:-1 
org.apache.struts2.components.UIBean.end(UIBean.java:521) 
org.apache.struts2.views.jsp.ComponentTagSupport.doEndTag(ComponentTagSupport.java:42) 
org.apache.jsp.index_jsp._jspx_meth_s_005fselect_005f0(index_jsp.java:300) 
org.apache.jsp.index_jsp._jspService(index_jsp.java:171) 
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70) 
javax.servlet.http.HttpServlet.service(HttpServlet.java:728) 
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:432) 
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390) 
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334) 
javax.servlet.http.HttpServlet.service(HttpServlet.java:728) 
org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:393) 
org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:88) 
root cause 

freemarker.core.InvalidReferenceException: Expression parameters.name is undefined on line 92, column 85 in template/simple/select.ftl. 
    freemarker.core.TemplateObject.assertNonNull(TemplateObject.java:124) 
    freemarker.core.Expression.getStringValue(Expression.java:118) 
    freemarker.core.Expression.getStringValue(Expression.java:93) 
    freemarker.core.StringBuiltins$StringBuiltIn._getAsTemplateModel(StringBuiltins.java:71) 
    freemarker.core.Expression.getAsTemplateModel(Expression.java:89) 
    freemarker.core.Expression.getStringValue(Expression.java:93) 
    freemarker.core.DollarVariable.accept(DollarVariable.java:76) 
    freemarker.core.Environment.visit(Environment.java:210) 
    freemarker.core.MixedContent.accept(MixedContent.java:92) 
    freemarker.core.Environment.visit(Environment.java:210) 
    freemarker.core.ConditionalBlock.accept(ConditionalBlock.java:79) 
    freemarker.core.Environment.visit(Environment.java:210) 
    freemarker.core.MixedContent.accept(MixedContent.java:92) 
    freemarker.core.Environment.visit(Environment.java:210) 
    freemarker.core.Environment.include(Environment.java:1483) 
    freemarker.core.Include.accept(Include.java:169) 
    freemarker.core.Environment.visit(Environment.java:210) 
    freemarker.core.MixedContent.accept(MixedContent.java:92) 
    freemarker.core.Environment.visit(Environment.java:210) 
    freemarker.core.Environment.process(Environment.java:190) 
    freemarker.template.Template.process(Template.java:237) 
    org.apache.struts2.components.template.FreemarkerTemplateEngine.renderTemplate(FreemarkerTemplateEngine.java:157) 
    org.apache.struts2.components.UIBean.mergeTemplate(UIBean.java:565) 
    org.apache.struts2.components.UIBean.end(UIBean.java:519) 
    org.apache.struts2.views.jsp.ComponentTagSupport.doEndTag(ComponentTagSupport.java:42) 
    org.apache.jsp.index_jsp._jspx_meth_s_005fselect_005f0(index_jsp.java:300) 
    org.apache.jsp.index_jsp._jspService(index_jsp.java:171) 
    org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70) 
    javax.servlet.http.HttpServlet.service(HttpServlet.java:728) 
    org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:432) 
    org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390) 
    org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334) 
    javax.servlet.http.HttpServlet.service(HttpServlet.java:728) 
    org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:393) 
    org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:88) 

Answer 1

對不起你們......我有我的答案。

我不得不給名我的選擇列表。