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EclipseLink JPA Inheritance Decision
@Entity
@Table(name="Person")
@Inheritance(strategy=InheritanceType.SINGLE_TABLE)
@DiscriminatorColumn(name="TYPE", discriminatorType=DiscriminatorType.STRING,length=20)
@DiscriminatorValue("P")
public class Person{

    @Id
    protected BigInteger id;
    protected String FirstName;
    ...
}

@Entity
@DiscriminatorValue("S")
public class Student extends Person{

    protected Integer YearInSchool;
    ...
}