Spring Boot + Yaml + @PropertySource + @ConfigurationProperties + List in Property Source file not injecting

Question

I'm trying to inject external.yml properties into a POJO using @ConfigurationProperties and importing my external.yml file using @PropertySource. All other were injected into POJO but not a complex list.

a. I tried using @NestedConfigurationProperty for the complex list and map. b. I tried complex POJO as inner static and outer class. c. Tried @EnableConfigurationProperties annotation. etc

ExternalProp.java

   @Component
   @PropertySource(value = "classpath:external.yml", encoding = "UTF-8")
   @ConfigurationProperties

   @Data
   public class ExternalProp {

    private String bla;
    private List<Person> persons;
    private List<String> other;

    @Data
    public static class Person {

        private int age;
        private String name;
        private Map<String, String> args;
    }

}

external.yml

   bla: bkdfjgkdf
   persons:
   -  age: 12
      name: bla1
      args:
        a0: a0dev
        a1: a1dev
        a2: a2dev
   -  age: 12
      name: bla2
      args:
        b0: b0dev
        b1: b1dev
        b2: b2dev
   strings: bla, bla1

bla: bkdfjgkdf and strings: bla, bla1 have been injected properly but not persons. Where am I making mistake.

And same persons object copied to application.yml file, then, BOOM, getting values properly.

I'm expecting a List of Persons which is having some Map args.

So the problem is when you use PropertySource right? It works if it is in application.yml without PropertySource — vanillaSugar, Aug 08 '19 at 11:32
I just verified, if it is external.properties instead of external.yml it is working fine. — Suresh M Sidy, Aug 08 '19 at 12:13
Possible duplicate of [Spring @PropertySource using YAML](https://stackoverflow.com/questions/21271468/spring-propertysource-using-yaml) — Simon Martinelli, Aug 08 '19 at 13:02
@SimonMartinelli thank you so much, after searching like hours this was my mistake — Phil, Aug 05 '20 at 09:38

score -2 · Answer 1 · answered Mar 19 '20 at 21:42

I believe it has to do with your yml formatting. try this

external.yml

   bla: bkdfjgkdf
   persons:
      -  age: 12
         name: bla1
         args:
           a0: a0dev
           a1: a1dev
           a2: a2dev
      -  age: 12
         name: bla2
         args:
           b0: b0dev
           b1: b1dev
           b2: b2dev
   strings: bla, bla1

Spring Boot + Yaml + @PropertySource + @ConfigurationProperties + List in Property Source file not injecting

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