spring MVC form:radiobutton typical usage not working - spring-mvc

Question

here is the addVariable.jsp
<h3>Add Process Variable</h3>
<br>
<form:form action="/cpms/vrms/add" commandName="processVariable">
<table>
<tr>
<td>Variable Name </td>
<td><form:input path="variableName" /></td>
</tr>
<tr>
<td>Symbol </td>
<td><form:input path="symbol" /></td>
</tr>
<tr>
<td>Description </td>
<td><form:textarea path="variableDescription" rows="3" cols="20" /></td>
</tr>
<tr>
<td>Unit</td>
<td><form:input path="unit" /></td>
</tr>
<tr>
<td>Type</td>
<td>
<form:radiobuttons path="dataType" items="${dataTypes}"/>
</td>
</tr>
<tr>
<td>Source</td>
<td><form:radiobuttons path="source" items="${sourceList}"/></td>
</tr>
<tr>
<td>Is Input?</td>
<td>
<form:radiobuttons path="input" value="true" />
<form:radiobuttons path="input" value="false" />
</td>
</tr>
<tr>
<td>Is Constant?</td>
<td>
<form:radiobuttons path="constant" value="true"/> Yes
<form:radiobuttons path="constant" value="false"/> No
</td>
</tr>
<tr>
<td colspan="2">
<input type="submit" value="Add Variable" />
</td>
</tr>
</table>
The VariableManagementController
public class VariableManagementController {
#Autowired
private IVariableManagementService variableManagementService;
private static final String ADD_FORM_PATH="cpms/vrms/addVariable";
#RequestMapping(value="/cpms/vrms/add/form",method=RequestMethod.GET)
String addProcessVariable(Model model){
DATA_TYPE[] dataTypes = DATA_TYPE.values();
SOURCE[] sourceList = SOURCE.values();
model.addAttribute("dataTypes",dataTypes);
model.addAttribute("sourceList",sourceList);
model.addAttribute("processVariable", new ProcessVariable());
return ADD_FORM_PATH;
}
The ProcessVariable bean
public class ProcessVariable {
private String variableId;
private String variableName;
private String variableDescription;
private String symbol;
private String unit;
private DATA_TYPE dataType;
private SOURCE source;
private boolean constant; //if isConstant=true then isOutput must be false
private boolean input;
//getters and setters
When i hit a link with target http://localhost:9090/wcc/cpms/vrms/add/form i get following exception.
org.apache.jasper.JasperException: An exception occurred processing JSP page /WEB-INF/jsp/cpms/vrms/addVariable.jsp at line 46
43: <tr>
44: <td>Is Input?</td>
45: <td>
46: <form:radiobuttons path="input" value="true" />
47: <form:radiobuttons path="input" value="false" />
48: </td>
49: </tr>
.
.
.
root cause
java.lang.IllegalArgumentException: Attribute 'items' is required and must be a Collection, an Array or a Map
I dont want to add an attribute in my model from within the controller for boolean values. It should have worked like this. I am using spring mvc 3.1.2
I dont think so using items=${inputTypes} is mandatory. i can simply use hardcoded values for my boolean values

Answer 1

If you are not using a list use
<form:radiobutton />
eg.
<form:radiobutton path="sex" value="M"/>Male
<form:radiobutton path="sex" value="F"/>Female
Here is a post explaning something similar:
http://www.mkyong.com/spring-mvc/spring-mvc-radiobutton-and-radiobuttons-example/