juliusz-cwiakalski / micronaut-properties-local-date-issue

Micronaut Micronaut -properties -loca -date -issue Application

Overview

This repository demonstrates pitfalls with Micronaut 3.6.0 properties mapping when using java.time.LocalDate properties in application.yml.

Described problems has been raised as Micronaut issue #7863.

See also YAML timestamp specification.

Tests use following properties class

@ConfigurationProperties("jcw")
@Data
@Introspected
public class Config {

  LocalDate localDateProperty;
  List<DatesListItem> dates;

  @Builder
  @Data
  @Introspected
  public static class DatesListItem {

    private String id;
    private String stringDate;
    private Date javaUtilDate;
    private LocalDate localDate;
  }

}

Problem 1: LocalDate property expressed as YAML date reports that Property doesn't exist

Example config

jcw:
  local-date-property: 2022-01-01

Test that demonstrates the issue LocalDateAsYamlDateTest.

Problem 2: LocalDate property expressed as YAML string reports that Unable to convert value [2022-01-01] to target type [LocalDate] due to: Text '2022-01-01' could not be parsed at index 4

Example config

jcw:
  local-date-property: '2022-01-01'

Test that demonstrates the issue LocalDateAsYamlStringTest.

Problem 3: List elements containing LocalDate property specified as YAML date are silently discarded

Example config

jcw:
  dates:
    - id: stringDate
      stringDate: 2022-01-01
    - id: javaUtilDate
      javaUtilDate: 2022-01-01
    # below entry is not mapped by micronaut because local date is specified as yaml timestamp
    # see https://yaml.org/type/timestamp.html
    - id: localDateAsDate
      localDate: 2022-01-01
    - id: localDateAsString
      localDate: '2022-01-01'
    -

Test that demonstrates the issue DatesOnListTest#shouldContainLocalDateExpressedAsDateInYaml .