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POSpring MVC ManyToMany in MultipleSelect
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  1. POSpring MVC ManyToMany in MultipleSelect
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    copied!<p>I came across to problem with ManyToMany relations between Restaurant and Tag class. I got:</p> <pre><code>public class Tag { @Id private int id; private String name; @ManyToMany @JoinTable(name="restaurant_tag", joinColumns={@JoinColumn(name="tag_id")}, inverseJoinColumns={@JoinColumn(name="restaurant_id")}) private List&lt;Restaurant&gt; restaurants; </code></pre> <p>and:</p> <pre><code>public class Restaurant { @Id @GeneratedValue private int id; (...) @ManyToMany @JoinTable(name="restaurant_tag", joinColumns={@JoinColumn(name="restaurant_id")}, inverseJoinColumns={@JoinColumn(name="tag_id")}) private List&lt;Tag&gt; tags; </code></pre> <p>In my jsp I got:</p> <pre><code>&lt;form:select multiple="true" path="tags"&gt; &lt;form:options items="${tagList }" itemValue="id" itemLabel="name" /&gt; &lt;/form:select&gt; </code></pre> <p>In my controller I got:</p> <pre><code>public ModelAndView myrestaurantadd(HttpServletRequest request, HttpServletResponse response, Restaurant restaurant) throws Exception { restaurantDAO.saveRestaurant(restaurant); } </code></pre> <p>When I click save button, I got error:</p> <p>Field error in object 'command' on field 'tags': rejected value [[Ljava.lang.String;@5babd8cb]; codes [typeMismatch.command.tags,typeMismatch.tags,typeMismatch.java.util.List,typeMismatch]; arguments [org.springframework.context.support.DefaultMessageSourceResolvable: codes [command.tags,tags]; arguments []; default message [tags]]; default message [Failed to convert property value of type [java.lang.String[]] to required type [java.util.List] for property 'tags'; nested exception is java.lang.IllegalArgumentException: Cannot convert value of type [java.lang.String] to required type [beans.Tag] for property 'tags[0]': no matching editors or conversion strategy found]] with root cause org.springframework.validation.BindException: org.springframework.validation.BeanPropertyBindingResult: 1 errors</p>
 

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