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POHibernate Session closings with Hadoop
 

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    <p>I'm an intermediate Hibernate user. I am trying to get some traction with Hadoop at my company. I'm using a library called spring-hadoop (https://github.com/SpringSource/spring-hadoop) to configure my application and inject my dependencies.</p> <p>I'm having a lot of trouble getting Hadoop to respect my hibernate sessions. I'm hitting the legendary LazyInitializationException.</p> <blockquote> <p>org.hibernate.LazyInitializationException: could not initialize proxy - no Session at org.hibernate.proxy.AbstractLazyInitializer.initialize(AbstractLazyInitializer.java:108) at org.hibernate.proxy.AbstractLazyInitializer.getImplementation(AbstractLazyInitializer.java:150) at org.hibernate.proxy.pojo.cglib.CGLIBLazyInitializer.invoke(CGLIBLazyInitializer.java:150) at p.model.ServicePoint$$EnhancerByCGLIB$$181013ec.getReadResolution() at p.service.ResourceService.getStartDate(ResourceService.java:77)</p> </blockquote> <p>Resolution is a lazy init field on a ServicePoint object that is retrieved with hibernate in the first part of the map task.</p> <p>The exception is thrown later on in the map task when I try to work with the ServicePoint object. It is not thrown in the reduce task. Modifying the ServicePoint hibernate mapping is not an option.</p> <p>I've tried a bunch of approaches suggested by my giant "Java Persistencee with Hibernate" book such as:</p> <ol> <li>Opening a session at the beginning of Map:</li> </ol> <blockquote> <p>Session session = this.sessionFactory.openSession(); session.beginTransaction();</p> </blockquote> <ol> <li>Adding stuff like this to my sessionFactory bean:</li> </ol> <blockquote> <p>prop key="hibernate.connection.release_mode">on_close &lt; /prop></p> </blockquote> <p>Before i pull out all stops and try stuff like Conversation Interceptors, can anyone give me a suggestion ? Nothing works and the exception keeps coming.</p> <p>Thanks, Raj</p>
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    1. USrajat banerjee
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