Data-Centric Applications with Vaadin 8

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@Datapublic 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 ...