Java Spring 3 RadioButtonsTag属性'；项目'；必须是数组、集合或映射异常

我将在JSP中以单选按钮的形式填充字符串列表。我将列表添加到ModelMap中，但仍然发生了以下异常。请问我错过了什么

属性“items”必须是数组、集合或映射： java.lang.IllegalArgumentException:属性“items”必须是 数组、集合或映射

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嗯。。。一切似乎都很好。。。您是否尝试过（测试）使用

字符串[]

？仅供参考，您能否将

ModelMap

更改为

Model

，并查看是否有任何更改？另请参见此示例：-其执行方式略有不同。

@Controller
public class EmployeeController {

    @Autowired
    private EmployeeManager employeeManager;

    @RequestMapping(value = {"/"}, method = RequestMethod.GET)
    public String homePage(ModelMap map) {
        map.addAttribute("employee", new Employee());
        populateDepartments(map);
        return "addEmployee";
    }

    private void populateDepartments(ModelMap map){
        List<String> departments = new ArrayList<String>();
        departments.add("Dept 1");
        departments.add("Dept 2");
        map.addAttribute("departments",departments);
    }
}

<form:form method="post" action="add" commandName="employee">

    <table>
    <tr>
        <td><form:label path="name">Name</td>
        <td><form:input path="name" /></td>
        <td>Address</td>
        <td><form:input path="address" /></td>
        <td>Departments</td>
        <td><form:radiobuttons path="empDepartment" items="${departments}"/></td> 
    </tr>    
    <tr>
        <td colspan="2">
            <input type="submit" value="Add"/>
        </td>
    </tr>
    </table>
 </form:form>

@Entity
public class Employee {

    @Id
    @GeneratedValue(strategy=GenerationType.AUTO)
    private Integer id;
    private String name;
    private String address;

    @Transient
    private String empDepartment;
}