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copied!<blockquote> <p>I am using ExtendedPerssisteenceContext as My Entities contain child Entity Collections of Lazy Loading type.</p> </blockquote> <p>This is not a good reason to use <code>EXTENDED</code>. I would suggest you to make it <code>default</code>, which is <code>TRANSACTION</code>. And it's good to make your <code>EntityManager</code> request-scoped, or method-scoped, in non-enterprise environment or when using application-managed persistence, as this is not a very heavy object to create. Moreover, neither using application-scoped EntityManager is a good idea, as it is not threadsafe. </p> <p>Having said that, as you are using JBoss, you should let the container handle the lifecycle of <code>EntityManager</code>, in case you are using JTA. Hence, just inject that with everything <code>default</code></p> <p><strong>Note:</strong></p> <p>Only stateful session beans can have a container-managed, extended entity manager.</p> <p><strong>Links:</strong></p> <ul> <li><a href="http://javanotepad.blogspot.com/2007/08/managing-jpa-entitymanager-lifecycle.html" rel="nofollow noreferrer">http://javanotepad.blogspot.com/2007/08/managing-jpa-entitymanager-lifecycle.html</a></li> <li><a href="https://blogs.oracle.com/enterprisetechtips/entry/extended_persistence_context_in_stateful" rel="nofollow noreferrer">https://blogs.oracle.com/enterprisetechtips/entry/extended_persistence_context_in_stateful</a></li> </ul> <p><strong>Suggestions:</strong></p> <p>Your business method should know whether to load the children or not. But that's the ideal case. A number of times we can't say that and completely depends on the user input -- we can't predict that well. Therefore, there are two solutions available, </p> <ol> <li>make a separate AJAX call to load children </li> <li>Use the filter called open-session-in-view. I would prefer the former.</li> </ol> <p><strong>Links:</strong></p> <ul> <li><a href="https://community.jboss.org/wiki/OpenSessionInView" rel="nofollow noreferrer">https://community.jboss.org/wiki/OpenSessionInView</a></li> <li><a href="http://static.springsource.org/spring/docs/1.2.9/api/org/springframework/orm/hibernate3/support/OpenSessionInViewFilter.html" rel="nofollow noreferrer">http://static.springsource.org/spring/docs/1.2.9/api/org/springframework/orm/hibernate3/support/OpenSessionInViewFilter.html</a></li> <li><a href="https://stackoverflow.com/questions/1103363/why-is-hibernate-open-session-in-view-considered-a-bad-practice">Why is Hibernate Open Session in View considered a bad practice?</a></li> </ul>

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