29.2. JPA vs Hibernate entity name

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When using the [`Session#createCriteria(String entityName)` or `StatelessSession#createCriteria(String entityName)`](https://docs.jboss.org/hibernate/orm/5.2/javadocs/org/hibernate/SharedSessionContract.html#createCriteria-java.lang.String-),
the **entityName** means the fully-qualified name of the underlying entity and not the name denoted by the `name` attribute of the JPA `@Entity` annotation.

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Considering you have the following entity:

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<pre class="prettyprint highlight">`@Entity(name = "ApplicationEvent")
public static class Event {

    @Id
    private Long id;

    private String name;
}`</pre>
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If you provide the JPA entity name to a legacy Criteria query:

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<pre class="prettyprint highlight">`List&lt;Event&gt; events =
    entityManager.unwrap( Session.class )
.createCriteria( "ApplicationEvent" )
.list();`</pre>
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Hibernate is going to throw the following `MappingException`:

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<pre class="prettyprint highlight">`org.hibernate.MappingException: Unknown entity: ApplicationEvent`</pre>
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On the other hand, the Hibernate entity name (the fully qualified class name) works just fine:

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<pre class="prettyprint highlight">`List&lt;Event&gt; events =
    entityManager.unwrap( Session.class )
.createCriteria( Event.class.getName() )
.list();`</pre>
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For more about this topic, check out the [HHH-2597](https://hibernate.atlassian.net/browse/HHH-2597) JIRA issue.

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