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POReceive an EnumSet from a spring form checkbox element?
 

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  1. POReceive an EnumSet from a spring form checkbox element?
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    <p>I've seen a few related questions on this topic but none that seem to exactly match what I'm after.</p> <p>I have a form where I'd like the user to be able to select a number of items from a checkbox list (backed by an enum), and to receive that as a Set. I have the following (using days as an example)</p> <p>My enum:</p> <pre><code>public enum Day { MONDAY, TUESDAY, WEDNESDAY, THURSDAY, FRIDAY, SATURDAY, SUNDAY } </code></pre> <p>Sending the enum values to the page in the controller to be displayed as the options:</p> <pre><code>model.addAttribute("allDays", Day.values()); </code></pre> <p>Writing the options as checkboxes and mapping to correct form field:</p> <pre><code>&lt;form:form method="get" modelAttribute="filterForm" commandName="filterForm"&gt; &lt;c:forEach items="${allDays}" var="item"&gt; &lt;form:checkbox path="days" value="${item.name()}" label="${item.name()}"/&gt; &lt;/c:forEach&gt; &lt;/form:form&gt; </code></pre> <p>The form object backing the form:</p> <pre><code>public class FilterForm { private EnumSet&lt;Day&gt; days; public EnumSet&lt;Day&gt; getDays() { return days; } public void setDays(EnumSet&lt;Day&gt; days) { this.days = days; } } </code></pre> <p>This works as far as showing the options correctly, but when I try to submit, I get an error:</p> <blockquote> <p>org.springframework.validation.BindException: org.springframework.validation.BeanPropertyBindingResult: 1 errors Field error in object 'filterForm' on field 'days': rejected value [0,1]; codes [typeMismatch.filterForm.days,typeMismatch.days,typeMismatch.java.util.EnumSet,typeMismatch]; arguments [org.springframework.context.support.DefaultMessageSourceResolvable: codes [filterForm.days,days]; arguments []; default message [days]]; default message [Failed to convert property value of type 'java.lang.String[]' to required type 'java.util.EnumSet' for property 'days'; nested exception is org.springframework.core.convert.ConversionFailedException: Failed to convert from type java.lang.String[] to type java.util.EnumSet for value '{0, 1}'; nested exception is java.lang.IllegalArgumentException: Could not instantiate Collection type: java.util.EnumSet] org.springframework.web.method.annotation.ModelAttributeMethodProcessor.resolveArgument(ModelAttributeMethodProcessor.java:111) org.springframework.web.method.support.HandlerMethodArgumentResolverComposite.resolveArgument(HandlerMethodArgumentResolverComposite.java:75) org.springframework.web.method.support.InvocableHandlerMethod.getMethodArgumentValues(InvocableHandlerMethod.java:156) org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:117) org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:96) org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:617) org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:578) org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:80) org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:923) org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:852) org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:882) org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:778) javax.servlet.http.HttpServlet.service(HttpServlet.java:621) javax.servlet.http.HttpServlet.service(HttpServlet.java:728)</p> </blockquote> <p>Any idea what the problem is or if there is a better way to achieve this? Thanks</p>
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