The example application

Throughout the chapter, we'll develop a Report Viewer. The following is a screenshot of the finished application:

The data model

The data model is based on a simple SQL table, Call, that contains columns for the ID, client name, phone number, city, start time, duration, and status. The following is a JPA Entity representing this table:

@Entity
@Data
public class Call {

@Id
    @GeneratedValue
private Long id;

private String client;

private String phoneNumber;

@Enumerated(EnumType.STRING)
private City city;

private LocalDateTime startTime;

private Integer duration;

@Enumerated(EnumType.STRING)
private Status status;
}

Status and City are simple Java enums that define some test values:

public enum Status {
RECEIVED, MISSED
}

public enum City {
    BOGOTA, TURKU, LONDON, BERLIN, HELSINKI, TOKYO, SAN_FRANCISCO, SIDNEY, LAGOS, VANCOUVER, SANTIAGO, BEIJING
}

Notice the @Enumerated annotations in the city and status fields of the Call class. This is used to persist the...