Concurrent Modification in JPA :

We can handle the concurrent modification issue by using the annotaion @Version in entity class.

 

E.g : 

    @Version

    @Column(name = "LAST_MODIFIED_TIME")

    private Date lastModifiedDate

 

  @version implies a version field in an entity.JPA uses a version field to detect concurrent modifications of a database record.

 

  it throws an exception to the transaction attempting to commit cuncurrent modification.

This prevents you from overwriting the previous commit.