```
@Target(value={METHOD,FIELD})
 @Retention(value=RUNTIME)
public @interface Version
```
Specifies the version field or property of an entity class that serves as its optimistic lock value. The version is used to ensure integrity when performing the merge operation and for optimistic concurrency control.
Only a single Version property or field should be used per class; applications that use more than one Version property or field will not be portable.
The Version property should be mapped to the primary table for the entity class; applications that map the Version property to a table other than the primary table will not be portable.
The following types are supported for version properties: int, Integer, short, Short, long, Long, java.sql.Timestamp.
```
    Example:

    @Version
    @Column(name="OPTLOCK")
    protected int getVersionNum() { return versionNum; }
 
```
Since:

Java Persistence 1.0

Document created the 11/06/2005, last modified the 18/08/2025
Source of the printed document:https://www.gaudry.be/en/java-api-javaee-rf-javax/persistence/Version.html

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References

Manuel PHP : https://docs.oracle.com, Version (Java(TM) EE 7 Specification APIs)

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Annotation Type Version

References