[hibernate-issues] [Hibernate-JIRA] Commented: (HHH-4278) Polymorphic query on abstract function

[Paul Benedict (JIRA)]

    [ http://opensource.atlassian.com/projects/hibernate/browse/HHH-4278?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=34243#action_34243 ] 

Paul Benedict commented on HHH-4278:
------------------------------------

I am curious myself why this is rejected. The property is abstract but any concrete instance would have it implemented.

> Polymorphic query on abstract function
> --------------------------------------
>
>                 Key: HHH-4278
>                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-4278
>             Project: Hibernate Core
>          Issue Type: Bug
>          Components: annotations
>            Reporter: radu
>            Priority: Blocker
>
> I have the following classes adnnotated with hibernate:
> <pre><code>
> @Entity
> @Inheritance(strategy=InheritanceType.JOINED)
> public abstract class Symbol 
>     implements Serializable {
>     
>     @Id
>     @GeneratedValue(strategy = GenerationType.AUTO)
>     private Integer id;
>     @AccessType("property")
>     public abstract String getCode();
>     
>     @AccessType("property")
>     public abstract void setCode(String code);
>  }
>  
> @javax.persistence.Entity
> @AttributeOverride( name="code", column = @Column(name="field1") )
> public class Child1 extends Symbol {
>     
>     @Basic
>     @Column(nullable = false)
>     private String field1;
>     
>     @AccessType("property")
>     public String getCode() {
>         return getField1();
>     }
>     
>     @AccessType("property")
>     public void setCode(String code) {
>         setField1(code);
>     }
>     
>     public void setField1(String field1) {
>         this.field1 = field1;
>     }
>     public String getField1() {
>         return field1;
>     }
> }
> @javax.persistence.Entity
> @AttributeOverride( name="code", column = @Column(name="field2") )
> public class Child2 extends Symbol {
>     
>     @Basic
>     @Column(nullable = false)
>     private String field2;
>     
>     @AccessType("property")
>     public String getCode() {
>         return getField2();
>     }
>     
>     @AccessType("property")
>     public void setCode(String code) {
>         setField1(code);
>     }
>     
>     public void setField1(String field2) {
>         this.field2 = field2;
>     }
>     public String getField2() {
>         return field2;
>     }
> }
> </code></pre>
> As objectual rules about polymorphisms the following query should be valid and to retrieve correct field value:
> session.createQuery("from Symbol s where s.code = :code");
> but it give me the error:
> org.hibernate.QueryException: could not resolve property: code of: ...
> Please give some advices how to work around this problem if this situation does not follow hibernate concept or JPA specs and is not possible to implement it.
> Idea is that it should be possible to work at hight level without changing database or existing classes.
> Thanks

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