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POUnable to fix: 'java.lang.String' to required type 'java.util.Collection'
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  1. POUnable to fix: 'java.lang.String' to required type 'java.util.Collection'
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    copied!<p>I'm getting this error when I submit my form and cannot figure out why this is happening. I believe the taglib should be handling this. I've tried changing the value passed in my jsp to <code>itemValue="id"</code> but it has no affect.</p> <pre><code>org.springframework.validation.BindException: org.springframework.validation.BeanPropertyBindingResult: 1 errors Field error in object 'content' on field 'stateCollection': rejected value [com.myapp.cmt.model.State[ id=3 ]]; codes [typeMismatch.content.stateCollection,typeMismatch.stateCollection,typeMismatch.java.util.Collection,typeMismatch]; arguments [org.springframework.context.support.DefaultMessageSourceResolvable: codes [content.stateCollection,stateCollection]; arguments []; default message [stateCollection]]; default message [Failed to convert property value of type 'java.lang.String' to required type 'java.util.Collection' for property 'stateCollection'; nested exception is java.lang.IllegalStateException: Cannot convert value of type [java.lang.String] to required type [com.myapp.cmt.model.State] for property 'stateCollection[0]': no matching editors or conversion strategy found] </code></pre> <p><strong>My jsp</strong></p> <pre><code>&lt;strong&gt;State&lt;/strong&gt;&lt;br/&gt; &lt;form:checkboxes path="stateCollection" items="${states}" itemLabel="name"/&gt; </code></pre> <p><strong>My Content</strong></p> <pre><code>public class Content implements Serializable { ....... @JoinTable(name = "content_to_state", joinColumns = { @JoinColumn(name = "content_id", referencedColumnName = "id")}, inverseJoinColumns = { @JoinColumn(name = "state_id", referencedColumnName = "id")}) @ManyToMany private Collection&lt;State&gt; stateCollection; ..... @XmlTransient public Collection&lt;State&gt; getStateCollection() { return stateCollection; } public void setStateCollection(Collection&lt;State&gt; stateCollection) { this.stateCollection = stateCollection; } ..... </code></pre> <p><strong>My Controller</strong></p> <pre><code>... @RequestMapping(value = "/{guid}/save", method = RequestMethod.POST) public ModelAndView saveContent(@ModelAttribute("content") Content content, @PathVariable("guid") String guid) { try { // Save the modified object contentService.save(content); } catch (IllegalOrphanException ex) { ... </code></pre> <p><strong>My content service</strong></p> <pre><code>... @Transactional public void save(Content content) throws IllegalOrphanException, NonexistentEntityException, RollbackFailureException, Exception { try { utx.begin(); em.merge(content); utx.commit(); } catch (Exception ex) { } finally { if (em != null) { em.close(); } } } ... </code></pre>
 

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