[hibernate-issues] [Hibernate-JIRA] Commented: (HHH-5792) Unable to JOIN embedded objects in Criteria API

[Thomas Pischke (JIRA)]

    [ http://opensource.atlassian.com/projects/hibernate/browse/HHH-5792?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=42611#action_42611 ] 

Thomas Pischke commented on HHH-5792:
-------------------------------------

Found a workaround by using the Metamodel.  With Metamodel syntax it is possible to Join an embedded object to its parent, and to use the resulting Join object to further join collections and reference contained in the embedded object.

> Unable to JOIN embedded objects in Criteria API
> -----------------------------------------------
>
>                 Key: HHH-5792
>                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-5792
>             Project: Hibernate Core
>          Issue Type: Bug
>          Components: entity-manager, query-criteria
>    Affects Versions: 3.6.0
>            Reporter: scLee
>            Priority: Blocker
>         Attachments: Client.java, CriteriaApiTest.java, Name.java
>
>
> Exception is thrown when trying to JOIN embedded attribute in Criteria API. E.g. having the following entity:
> {quote}
> @Entity
> public class Client implements Serializable {    
>     @Id
>     public int id;
>     @Embedded
>     public Name name;
> }
> @Embeddable
> public class Name implements Serializable {
>     @Column
>     public String firstName;
>     @Column
>     public String lastName;
> }
> {quote}
> The following code
> {quote}
>         CriteriaQuery< Client > cq = cb.createQuery( Client.class );
>         Root< Client > root = cq.from( Client.class );
>         cq.where( cb.equal( root.*join*( "name" ).get( "firstName" ), "foo" ) );
> {quote}
> throws this exception:
> {quote}
> java.lang.ClassCastException: org.hibernate.ejb.metamodel.SingularAttributeImpl cannot be cast to javax.persistence.metamodel.ManagedType
> 	at org.hibernate.ejb.criteria.path.AbstractFromImpl.locateManagedType(AbstractFromImpl.java:151)
> 	at org.hibernate.ejb.criteria.path.AbstractFromImpl.locateAttributeInternal(AbstractFromImpl.java:145)
> 	at org.hibernate.ejb.criteria.path.AbstractPathImpl.locateAttribute(AbstractPathImpl.java:216)
> 	at org.hibernate.ejb.criteria.path.AbstractFromImpl.join(AbstractFromImpl.java:449)
> 	at org.hibernate.ejb.criteria.path.AbstractFromImpl.join(AbstractFromImpl.java:433)
> 	at foo.CriteriaApiTest.embeddableInPath(CriteriaApiTest.java:45)
> {quote}

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