How to import application.yml property in an annotation in dto class

Question

Application.yml

 datetime:
      format: yyyy/MM/dd HH:mm:ss

transaction.java

@Entity
@Getter
@Setter
@NoArgsConstructor
public class Transaction{

    @Id
    @NotNull
    @Enumerated(EnumType.STRING)
    private TransactionSourceEnum transactionSource;

    @Id
    @NotNull
    @Column(unique = true)
    private String transactionId;

    private String responseCode;

    private String failureReason;

    @NotNull
    @JsonFormat(pattern = "yyyy/MM/dd HH:mm:ss")
    private Date transactionCreSysDate;

}

I tried this

@JsonFormat(pattern = "${datetime.format}")

It won't work. I want to replace the JsonFormat pattern with datetime.format

Answer 1

The real solution would be to use the property during the configuration of ObjectMapper.

In spring the simplest way to do that is to define value for the property

spring.jackson.date-format=${datetime.format}

The main drawback of this solution is that it only allows configuring one date format per application. Because, as you noted, it is not possible to use SPEL inside @JsonFormat annotation. And it is also impossible to use non-constant fields in the annotation parameters. I don't think there is a simple solution that would allow for configuring date format with configuration property.