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POwhy does Hibernate's EntityManager.find() impl throw EntityNotFoundException?
 

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  1. POwhy does Hibernate's EntityManager.find() impl throw EntityNotFoundException?
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    <p>JPA 2.0 <a href="http://docs.oracle.com/javaee/6/api/javax/persistence/EntityManager.html#find%28java.lang.Class,%20java.lang.Object%29" rel="nofollow">javadoc</a> (and probably the spec) say that EntityManager.find() returns null when entity isn't found:</p> <blockquote> <p>the found entity instance or null if the entity does not exist</p> </blockquote> <p>Yet Hibernate's impl throws EntityNotFoundException instead. Why? Observed using Hibernate 3.6.8 and <a href="http://search.maven.org/#artifactdetails%7Corg.hibernate.javax.persistence%7Chibernate-jpa-2.0-api%7C1.0.1.Final%7Cjar" rel="nofollow">hibernate-jpa-2.0-api v1.0.1.Final</a></p> <blockquote> <p>javax.persistence.EntityNotFoundException: Unable to find bar.foo.Entity with id 144487 at org.hibernate.ejb.Ejb3Configuration$Ejb3EntityNotFoundDelegate.handleEntityNotFound(Ejb3Configuration.java:137) at org.hibernate.event.def.DefaultLoadEventListener.returnNarrowedProxy(DefaultLoadEventListener.java:320) at org.hibernate.event.def.DefaultLoadEventListener.proxyOrLoad(DefaultLoadEventListener.java:277) at org.hibernate.event.def.DefaultLoadEventListener.onLoad(DefaultLoadEventListener.java:152) at org.hibernate.impl.SessionImpl.fireLoad(SessionImpl.java:1090) at org.hibernate.impl.SessionImpl.get(SessionImpl.java:1005) at org.hibernate.impl.SessionImpl.get(SessionImpl.java:998) at org.hibernate.ejb.AbstractEntityManagerImpl.find(AbstractEntityManagerImpl.java:779) at org.hibernate.ejb.AbstractEntityManagerImpl.find(AbstractEntityManagerImpl.java:754)</p> </blockquote>
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    1. COShow us your code.
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    2. COthe stack trace provides enough info - it's all HB code, which you can see in hibernate-entitymanager-3.6.8-sources.jar in maven repo
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    3. CONo it doesn't. For example, it doesn't tell if the entity is already loaded in the session or not. It also doesn't say which entity class you're trying to find. But if you don't want to get help, don't provide any info.
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