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POMultiple Select in Spring 3.0 MVC
 

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    <p>Ok so I've been trying to accomplish multiple selects in Spring MVC for a while and have had no luck.</p> <p>Basically what I have is a Skill class:</p> <pre><code>public class Skill { private Long id; private String name; private String description; //Getters and Setters } </code></pre> <p>And an Employee who has multiple Skills:</p> <pre><code>public class Employee { private Long id; private String firstname; private String lastname; private Set&lt;Skill&gt; skills; //Getters and Setters } </code></pre> <p>All of these are mapped to Hibernate but that shouldn't be an issue.</p> <p>Now I would like to be able to do in the JSP is to select Skills for an Employee from a <code>&lt;select multiple="true"&gt;</code> element. </p> <p>I have tried this in the JSP with no luck:</p> <pre><code>&lt;form:select multiple="true" path="skills"&gt; &lt;form:options items="skillOptionList" itemValue="name" itemLabel="name"/&gt; &lt;form:select&gt; </code></pre> <p>Here is my Controller:</p> <pre><code>@Controller @SessionAttributes public class EmployeeController { @Autowired private EmployeeService service; @RequestMapping(value="/addEmployee", method = RequestMethod.POST) public String addSkill(@ModelAttribute("employee") Employee emp, BindingResult result, Map&lt;String, Object&gt; map) { employeeService.addEmployee(emp); return "redirect:/indexEmployee.html"; } @RequestMapping("/indexEmployee") public String listEmployees(@RequestParam(required=false) Integer id, Map&lt;String, Object&gt; map) { Employee emp = (id == null ? new Employee() : employeeService.loadById(id)); map.put("employee", emp); map.put("employeeList", employeeService.listEmployees()); map.put("skillOptionList", skillService.listSkills()); return "emp"; } } </code></pre> <p>But this does not seem to work. I get the following Exception:</p> <pre><code>SEVERE: Servlet.service() for servlet jsp threw exception javax.servlet.jsp.JspException: Type [java.lang.String] is not valid for option items </code></pre> <p>I feel like it should be possible where we can have a form for a Model that has multiple select from a list of options provided. What is the best practice to have <code>form:select</code> and <code>form:options</code> in Spring 3.0 MVC?</p> <p>Thanks!</p> <p><strong>Solution:</strong></p> <p>Ok so just in case anyone wonders what the solution is. In addition to user 01001111 fix:</p> <pre><code>&lt;form:select multiple="true" path="skills"&gt; &lt;form:options items="${skillOptionList}" itemValue="name" itemLabel="name"/&gt; &lt;form:select&gt; </code></pre> <p>We need to add a <code>CustomCollectionEditor</code> to the controller as follows:</p> <pre><code>@Controller @SessionAttributes public class EmployeeController { @Autowired private EmployeeeService employeeService; @Autowired private SkillService skillService; @InitBinder protected void initBinder(WebDataBinder binder) { binder.registerCustomEditor(Set.class, "skills", new CustomCollectionEditor(Set.class) { @Override protected Object convertElement(Object element) { Long id = null; if(element instanceof String &amp;&amp; !((String)element).equals("")){ //From the JSP 'element' will be a String try{ id = Long.parseLong((String) element); } catch (NumberFormatException e) { System.out.println("Element was " + ((String) element)); e.printStackTrace(); } } else if(element instanceof Long) { //From the database 'element' will be a Long id = (Long) element; } return id != null ? employeeService.loadSkillById(id) : null; } }); } } </code></pre> <p>This allows Spring to add Sets of Skills between the JSP and Model.</p>
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