[jira] Commented: (OPENJPA-1564) How to Utilizing the variable define in non-entity base class, in the entity sub class.

["Rajeev Chaudhary (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/OPENJPA-1564?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12870692#action_12870692 ] 

Rajeev Chaudhary commented on OPENJPA-1564:
-------------------------------------------

To Inherit the properties of a base class, we only add "@MappedSuperclass" as shown below. Also this class BaseFacDto should also be defined in the persistance.xml. 
@MappedSuperclass
public abstract class BaseFacDto implements  Serializable{

}



> How to Utilizing the variable define in non-entity base class, in the entity sub class.
> ---------------------------------------------------------------------------------------
>
>                 Key: OPENJPA-1564
>                 URL: https://issues.apache.org/jira/browse/OPENJPA-1564
>             Project: OpenJPA
>          Issue Type: Question
>            Reporter: Rajeev Chaudhary
>   Original Estimate: 24h
>  Remaining Estimate: 24h
>
> I have BaseFacDto class with defined properties. I have sub-class FacDto (entity) extending BaseFacDto. 
> public abstract class BaseFacDto {
> 	@Column(name="FAC_NAME")
> 	public String facName;
> ---
> }
> @Entity
> @Table(name="FAC")
> public class FacDto extends BaseFacDto implements Serializable {
> 	public FacDto(){}
> 	@Id @Column(name="FAC_ID", nullable = false)
> 	private String facId;
> 	@Column(name="FAC_ADDRESS")
> 	private String facAddress;
> 	@Column(name="LABID")
> }
> Questions:
> 1. When the query   fac = clep.find(FacDto.class, facId);    I don't see FAC_NAME in the logged SQL generated.  Since Base class has this variable, so sub-class also get it by inheritance.  Please verify. I have define it like this in base class
>        @Column(name="FAC_NAME")
> 	private String facName; 
> 2. I also tried this thing. I created the variable in the sub-class without getter-setter. Now I see the FAC_NAME in the sql log. But the issue now is when I execute getter methods ( inherited from base class). the value is always null.
>         @Column(name="FAC_NAME")
> 	private String facName;
> 3. How OpenJPA different from JPA. I see that all OpenJpa sample uses the javax.persistance.jar (JPA jar). I am little confused over this. Please clarify
> http://openjpa.apache.org/quick-start.html
> Please help. 
> Thanks in advance
> Rajeev

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