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POHibernate: No session after save of new entity
 

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  1. POHibernate: No session after save of new entity
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    <p>I create a new entity, store it the first time and then want to access the collections of the related classes: </p> <pre><code> @Override protected void onSubmit(final AjaxRequestTarget target, final Form&lt;?&gt; form) { final E entity = (E) form.getModelObject(); getDao().save(entity); //calls session.saveOrUpdate(entity) LOG.debug("Saved entity " + entity); LOG.debug("Show collections " + entity.getField().getListOfSomething()); parent.replaceContentPanel(parent.getDetailsPanel(parent.createReloadableModel(entity)), target); } </code></pre> <p>I get the following error on the second line of logging:</p> <pre><code>org.hibernate.LazyInitializationException: failed to lazily initialize a collection of role: no session or session was closed </code></pre> <p>I have also tried </p> <pre><code>Hibernate.initialize(getDetailsModel().getObject().getField().getListOfSomething()); </code></pre> <p>This leads to a different error: </p> <pre><code>org.hibernate.HibernateException: collection is not associated with any session </code></pre> <p>This is not very surprising when debugging I can see that the collection proxies have no session associated with them. </p> <p>I am using the 'openSessionInView' filter that comes with the Spring framework. The code works fine by the way when I want to update an existing entity. It also works when I set the fetchType to eager on the collection:</p> <pre><code>@OneToMany(mappedBy = "field", fetch = FetchType.EAGER) private List&lt;E&gt; listOfSomething= new ArrayList&lt;E&gt;(); </code></pre> <p>Do I really need to set this to EAGER? I want to avoid this very much and was hoping for a way around it. Is there a way to associate a newly stored entity with the Hibernate session? I have tried both a <code>session.load(entity)</code> and a <code>session.merge(entity)</code> with no success.</p> <p>My entities look like this:</p> <pre><code>@Entity class A { @ManyToOne B b; } @Entity class B { @OneToMany(mappedBy = "b") List&lt;A&gt; aList; @OneToMany(mappedBy = "b") List&lt;C&gt; cList; } @Entity class C { @ManyToOne B b; } </code></pre> <p>What I am doing is creating a <code>c = new C()</code>, selecting <code>b</code> from a <code>DropDownChoice</code> and on submit I want to persist <code>getDao().save(c)</code>. After the submit I want to display my new entity on a different panel which is loaded via ajax. For example I want to display <code>c.getB().getAList()</code> and that is where the exception happens because the <code>b</code>I selected from the <code>DropdownChoice</code>is a detached entity and it's <code>aList</code> was not fetched and cannot be loaded lazily either.</p> <p>I cannot figure out how to get the still existing session into my new <code>C</code> instance. </p> <p>Here's more info from my <code>web.xml</code></p> <pre><code>&lt;filter&gt; &lt;filter-name&gt;opensessioninview&lt;/filter-name&gt; &lt;filter-class&gt;org.springframework.orm.hibernate3.support.OpenSessionInViewFilter&lt;/filter-class&gt; &lt;/filter&gt; &lt;filter-mapping&gt; &lt;filter-name&gt;opensessioninview&lt;/filter-name&gt; &lt;url-pattern&gt;/*&lt;/url-pattern&gt; &lt;/filter-mapping&gt; </code></pre>
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    1. COThe 'openSessionInView'-filter you're using, when/where does the transaction start and commit?
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    2. COHow does your Entity look like? E.g. does the save operation cascade to the collection?
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    3. COPlease include relevant parts of your web.xml (dispatcher servlet and OpenSessionInView filter)
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