JPA abstract entity - better way

AbstractEntity.java

import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.MappedSuperclass;
import java.io.Serializable;

@MappedSuperclass
public abstract class AbstractEntity<PK extends Serializable> {

    public static final String GENERATOR = "customSequence";

    @Id
    @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = GENERATOR)
    private PK id;

    public PK getId() {
        return id;
    }

    public void setId(PK id) {
        this.id = id;
    }

    @Override
    public int hashCode() {
        if (getId() != null) {
            return getId().hashCode();
        }
        return super.hashCode();
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj) {
            return true;
        }
        if (obj == null) {
            return false;
        }
        if (getClass() != obj.getClass()) {
            return false;
        }
        AbstractEntity<?> other = (AbstractEntity<?>) obj;
        if (getId() == null || other.getId() == null) {
            return false;
        }
        if (!getId().equals(other.getId())) {
            return false;
        }
        return true;
    }

}

User.java

import javax.persistence.*;

@Entity
@SequenceGenerator(name = AbstractEntity.GENERATOR, sequenceName="SQ_USERS")
@AttributeOverride(name="id", column=@Column(name = "USER_ID"))
public class User extends AbstractEntity<Long> {

    @Column(name = "USR_NAME", nullable = false)
    private String name;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

}

And how do you implement another entity with a different sequence name?