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POHow to update the collection of @onetomany relationship
 

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  1. POHow to update the collection of @onetomany relationship
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    <p>I have the following code:</p> <pre><code>public class Parent{ @OneToMany(mappedBy="parent", targetEntity= Child.class, fetch = FetchType.LAZY, cascade= CascadeType.ALL, orphanRemoval=true) List&lt;Child&gt; children; } public class Child{ @ManyToOne( targetEntity=Cotizacion.class, optional=false, fetch=FetchType.LAZY ) @JoinColumn( name = "ID_PARENT", nullable = false ) private Parent parent; } </code></pre> <p>Now in the client side i'm using GWT editor framework to edit the whole parent object, i mean.</p> <pre><code>Editor&lt;ParentProxy&gt; ListEditor&lt;List&lt;ChildProxy&gt;&gt; </code></pre> <p>I have the requirement to edit the whole object on the same editor, so if i update a Child from the Parent and then flush() the driver the changes are propagated correctly.</p> <p>The problem. On the server side i get the Parent with the children collection as persistedbag as null. (the Locator find() method is called for every Children). So if i do a change in the client side that is not propagated to the server side into the data base.</p> <p>Note 1.- I check the whole object on the client side and the changes were made by the editor driver.</p> <p>Note 2.- I tryed to retreive the whole object on the find() method of the Locator and doesn't work.</p> <p>Note 3.- If i send the list as other parameter in my RequestContext and then update every child on the server side (DAO) it updates them correctly.</p> <p><strong>UPDATE:</strong> if i add a null to the children i get the whole list on server side instead of the persistedbag and the the update on the Child ocurrs.</p> <p>Ex. parent.getChilds().add(null);</p> <p>How RequestFactory makes the delta changes on the entities?</p> <p>Any help would be apreciated.</p> <p><strong>UPDATE 2:</strong>solution of thomas.</p> <p>The classes (listeners):</p> <pre><code> public class HibernateUtil implements ServletContextListener {} public class AppSessionManager implements Filter {} </code></pre> <p>The line that hibernate needs:</p> <pre><code> &lt;property name="current_session_context_class"&gt;thread&lt;/property&gt; </code></pre> <p>The web.xml config:</p> <pre><code> &lt;!-- Servlet context listerner --&gt; &lt;listener&gt; &lt;listener-class&gt;xxx.yyy.server.tools.HibernateUtil&lt;/listener-class&gt; &lt;/listener&gt; &lt;!-- Servlet for filter --&gt; &lt;filter&gt; &lt;filter-name&gt;HibernateFilter&lt;/filter-name&gt; &lt;filter-class&gt;xxx.yyy.server.tools.AppSessionManager&lt;/filter-class&gt; &lt;/filter&gt; &lt;filter-mapping&gt; &lt;filter-name&gt;HibernateFilter&lt;/filter-name&gt; &lt;url-pattern&gt;/gwtRequest&lt;/url-pattern&gt; &lt;/filter-mapping&gt; </code></pre> <p>the entity locator:</p> <pre><code>public class BaseEntityLocator extends Locator&lt;BaseEntity, Integer&gt; { /* * Method to fetch an object and merge the updates * * @see com.google.web.bindery.requestfactory.shared.Locator#find(java.lang.Class, java.lang.Object) */ @Override public BaseEntity find(Class&lt;? extends BaseEntity&gt; clazz, Integer id) { Session session = HibernateUtil.getSessionFactory().getCurrentSession(); try { BaseEntity baseEntity = (BaseEntity) session.get(clazz, id); return baseEntity; } catch (RuntimeException e) { throw e; } } ... } </code></pre> <p>Result? no more LazyInitializationException and other problems updating relations of type one to many. Hope this helps some one else.</p>
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Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

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