Error is Spring MVC - items should be Map, Array or a collection.

Hi All,

I am trying to use spring MVC and get the following error:

org.apache.jasper.JasperException: Attribute 'items' must be a Collection, an Array or a Map
	org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:395)
	org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
	org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:688)
	org.springframework.web.servlet.view.InternalResourceView.renderMergedOutputModel(InternalResourceView.java:236)
	org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:257)
	org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1183)
	org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:902)
	org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:807)
	org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:571)
	org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:501)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:595)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:688)
	com.opensymphony.module.sitemesh.filter.PageFilter.parsePage(PageFilter.java:119)
	com.opensymphony.module.sitemesh.filter.PageFilter.doFilter(PageFilter.java:55)

root cause

java.lang.IllegalArgumentException: Attribute 'items' must be a Collection, an Array or a Map
	org.springframework.web.servlet.tags.form.AbstractMultiCheckedElementTag.writeTagContent(AbstractMultiCheckedElementTag.java:220)
	org.springframework.web.servlet.tags.form.AbstractFormTag.doStartTagInternal(AbstractFormTag.java:90)
	org.springframework.web.servlet.tags.RequestContextAwareTag.doStartTag(RequestContextAwareTag.java:77)
	org.apache.jsp.WEB_002dINF.jsp.AddKPI_jsp._jspx_meth_form_radiobuttons_0(org.apache.jsp.WEB_002dINF.jsp.AddKPI_jsp:633)
	org.apache.jsp.WEB_002dINF.jsp.AddKPI_jsp._jspx_meth_c_forEach_0(org.apache.jsp.WEB_002dINF.jsp.AddKPI_jsp:598)
	org.apache.jsp.WEB_002dINF.jsp.AddKPI_jsp._jspService(org.apache.jsp.WEB_002dINF.jsp.AddKPI_jsp:360)
	org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:688)
	org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:332)
	org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
	org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:688)
	org.springframework.web.servlet.view.InternalResourceView.renderMergedOutputModel(InternalResourceView.java:236)
	org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:257)
	org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1183)
	org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:902)
	org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:807)
	org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:571)
	org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:501)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:595)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:688)
	com.opensymphony.module.sitemesh.filter.PageFilter.parsePage(PageFilter.java:119)
	com.opensymphony.module.sitemesh.filter.PageFilter.doFilter(PageFilter.java:55)

I have a simple jsp page with a drop down that IS POPULATED AS MAP IN THE CONTROLLER.

Here is my jsp page :

<%@ page language="java" pageEncoding="ISO-8859-1"%>
<%@ taglib prefix="form" uri="http://www.springframework.org/tags/form" %>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
	<head>
		<title>Add</title>
		<meta http-equiv="pragma" content="no-cache">
		<meta http-equiv="cache-control" content="no-cache">
		<meta http-equiv="expires" content="0">    
		<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
		<meta http-equiv="description" content="This is my page">
	</head>
	<body>
		<form:form>
    		<table>
     			<tr>
     				<td>Owner</td>
 				<td>
 					<form:select path="subProcessName">
 						<form:option label="Select one ..." value="" />
 						<form:options items="${subProcesses}" />
 					</form:select>
 				</td>
 			</tr>	 	
 		        <tr>
 		        	<td >
                 			<input type="submit" value="Save Changes" />
             			</td>
         		</tr>
     		</table>
		</form:form>
	</body>
</html>

"subProcesses" is a Map that is set in the controller's reference data method.

Many Thanks.

Can you post the controller code?

And to make sure it's a Map - try and print subProcesses.getClass().getName() or subProcesses.toString() in the JSP and see what it thinks it's getting instead of a Map subclass.

Resolved it for the time being .. my replacing some jars notibly spring-web-mvc.jar.

Working on a tight schedule .. so will see later what and why the error

Thanks for help.