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POSpring MVC usage of form:checkbox to bind data
 

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    <p>I know there have been already questions around this topic, but I have not figured out how to solve the following issue:</p> <p>I have a user/roles relationship and I want to list all available roles in a JSP as checkbox items, where the users assigned checkboxes are selected. However, the matching items are not checked (here I am using Spring 3.1).</p> <p>Extract from the User object:</p> <pre><code>private Set&lt;RoleEntity&gt; roles = new HashSet&lt;RoleEntity&gt;(); </code></pre> <p>Extract from the Spring Controller (adding user object and role list to Model):</p> <pre><code>UserEntity userEntity = userEntityService.findById(UserEntity.class, new Long(id)); model.addAttribute("userAttribute", userEntity); List&lt;RoleEntity&gt; roleList = roleEntityService.findAll(); model.addAttribute("roleList", roleList); </code></pre> <p>Extract from the JSP:</p> <pre><code>&lt;form:form modelAttribute="userAttribute" method="POST" action="${saveUrl}"&gt; ... &lt;table align="center"&gt; &lt;tr&gt; &lt;td&gt;ID&lt;/td&gt; &lt;td&gt;Role Name&lt;/td&gt; &lt;/tr&gt; &lt;c:forEach items="${roleList}" var="role" varStatus="status"&gt; &lt;tr&gt; &lt;td&gt;&lt;form:checkbox path="roles" value="${role}" label="${role.id}" /&gt;&lt;/td&gt; &lt;td&gt;&lt;c:out value="${role.name}" /&gt;&lt;/td&gt; &lt;/tr&gt; &lt;/c:forEach&gt; &lt;/table&gt; ... &lt;/form:form&gt; </code></pre> <p>The Spring MVC documentation says this: When the bound value is of type array or java.util.Collection, the input(checkbox) is marked as 'checked' if the configured setValue(Object) value is present in the bound Collection.</p> <p>Isn't that the case here? What am I missing here?</p> <p>Thanks a lot.</p> <p>Paul</p>
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