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copied!<p>Ok so apparently I had to make a propertyEditor for Developer. There is a good explanation on this site:</p> <p><a href="http://static.springsource.org/spring/docs/2.0.x/reference/validation.html" rel="nofollow">http://static.springsource.org/spring/docs/2.0.x/reference/validation.html</a></p> <p>Edit extra information:</p> <p>So apparently when you check a checkbox it will give you the value as a string. Ofcourse the Collection had to be made with developer objects. </p> <p>So I created a developerEditor:</p> <pre><code>package domainmodel; import java.beans.PropertyEditorSupport; public class DeveloperEditor extends PropertyEditorSupport { private GameOrganizer gameOrganizer; public void setGameOrganizer(GameOrganizer gameOrganizer) { this.gameOrganizer = gameOrganizer; } @Override public void setAsText(String id) { long id2 = Long.parseLong(id); Developer type = gameOrganizer.getDeveloper(id2); setValue(type); } } </code></pre> <p>And with the checkboxes I gave as itemvalue the id of the object</p> <pre><code><form:checkboxes id="selectdeveloper" items="${allDevelopers}" itemValue="id" path="developers" itemLabel="name" /> </code></pre> <p>Then in the formcontroller I override the initBinder method. So that when I Spring has to fill in a developer object it will first convert it from string to a Developer Object using my editor.</p> <pre><code> private DeveloperEditor developerEditor; public void setDeveloperEditor(DeveloperEditor developerEditor){ this.developerEditor = developerEditor; developerEditor.setGameOrganizer(gameOrganizer); } @Override protected void initBinder(HttpServletRequest request, ServletRequestDataBinder binder) { binder.registerCustomEditor(Developer.class, developerEditor); } </code></pre> <p>That's it folks. If anyone has any questions I will be glad to answer them.</p>

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