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From "Fay Wang (JIRA)" <j...@apache.org>
Subject [jira] Created: (OPENJPA-578) Specifying a default for VersionStrategy in persistence.xml has no effect when a version field is present in the entity class.
Date Mon, 21 Apr 2008 03:22:21 GMT
Specifying a default for VersionStrategy in persistence.xml has no effect when a version field
is present in the entity class.
------------------------------------------------------------------------------------------------------------------------------

                 Key: OPENJPA-578
                 URL: https://issues.apache.org/jira/browse/OPENJPA-578
             Project: OpenJPA
          Issue Type: Bug
          Components: jdbc
    Affects Versions: 1.0.2
            Reporter: Fay Wang
             Fix For: 1.2.0
         Attachments: openjpa.patch

Specifying a default for VersionStrategy in persistence.xml has no effect when a version field
is present in the entity class.

According the OpenJPA documentation the following property should override the default value
of VersionStrategy and the specified RowChangeTimestampStrategy should be applied for all
entity classes. 

 <property name="openjpa.jdbc.MappingDefaults" 
  	        value="jpa(VersionStrategy=com.ibm.websphere.persistence.RowChangeTimestampStrategy)"
/>

JPA accepts this property but then it has no effect on Entity mappings if the version field
is present.

import javax.persistence.*;
import org.apache.openjpa.persistence.jdbc.VersionStrategy;

@Entity
public class EntityA {
	@Id int id;
	String name;
	double amt;
	@Version java.sql.Timestamp lastUpdate;

For EntityA, the version strategy should be RowChangeTimestampStrategy. Instead, the NumberVersionStrategy
is adopted. 
If the @Version is removed from EntityA, the version strategy becomes RowChangeTimestampStrategy.



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