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POjsf - spring - hibernate transaction management
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  1. POjsf - spring - hibernate transaction management
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    copied!<p>I'm having trouble figuring the best way to manage transactions in a jsf - spring - hibernate situation. What clued me in was I got the following error message:</p> <pre><code>failed to lazily initialize a collection of role: [class name], no session or session was closed </code></pre> <p>My managed bean called the spring bean which did a call to the dao which uses hibernate and retrieved a collection that had a one-to-many relationship. When I tried to examine the collections I got the error (I know that if I traverse the collection in the dao that will preserve the data but I want to go beyond that).</p> <p>Here is the managed bean code:</p> <pre><code>@Transactional private void loadAppointments() { employees = userService.getEmployees(); } </code></pre> <p>(Note: It is when I try and traverse employees that I get the error.)</p> <p>Here is the spring bean call:</p> <pre><code>public Set&lt;Employee&gt; getEmployees() { return getUserDAO().getEmployees(); } </code></pre> <p>and here is the dao code:</p> <pre><code>List&lt;Employee&gt; employees = getSessionFactory().getCurrentSession().createQuery(" from Employee ").list(); return new HashSet&lt;Employee&gt;(employees); </code></pre> <p>here is part of my applicationContext.xml relating to transactions:</p> <pre><code>&lt;!-- Enable the configuration of transactional behavior based on annotations --&gt; &lt;tx:annotation-driven transaction-manager="txManager"/&gt; &lt;!-- Transaction Manager is defined --&gt; &lt;bean id="txManager" class="org.springframework.orm.hibernate4.HibernateTransactionManager"&gt; &lt;property name="sessionFactory" ref="SessionFactory"/&gt; &lt;/bean&gt; </code></pre> <p>I'm not sure why the @Transactional annotation failed in the Spring bean, could someone explain it to me?</p> <p>One person recommended using JPATransactionManager, but I have no experience with it and I was wondering if anyone else had any recommendations. What's the best / easiest way to control a transaction from my Spring bean? Is there an article or something which lays out the options? This seems to be a fairly dense subject so all help appreciated.</p> <p>Edit: com.dave.model.User com.dave.model.Client com.dave.model.Appointment com.dave.model.Employee com.dave.model.Certificate org.hibernate.dialect.MySQLDialect true </p>
 

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