Inject List of Custom Object to map using spring boot configuration properties-CodePudding

Getting issue with ConfigurationProperties. I have a configuration like this

com:
  test:
    app:
      units:
        unit:
          - query:
              matchType: "sadas"
          - query:
              matchType: "sadas"

Wanted to inject this application.yaml to this Map<String,List<Query>>. My Configuration code is like this.


@Component
@ConfigurationProperties(prefix = "com.test.app")
public class UnitsConfiguration {

    private Map<String,List<Query>> units;
//settter, getter
}



public class Query {
    private String matchType;
//settter, getter
}

Error I am getting while running this.

***************************
APPLICATION FAILED TO START
***************************

Description:

Binding to target [Bindable@7e357c39 type = java.util.List<Query>, value = 'none', annotations = array<Annotation>[[empty]]] failed:

    Property: com.test.app.units.unit[0].query.matchtype
    Value: "sadas"
    Origin: class path resource [application.yaml] - 20:26
    Reason: The elements [com.test.app.units.unit[0].query.matchtype,com.test.app.units.unit[1].query.matchtype] were left unbound.

CodePudding user response：

It looks like your YAML is not defined correctly. Here is working YAML along with Java code

Here is formatted YAML

server:
  credentials:
    - list1:
      - key1:
        username: root
        password: rootpass
      - key2:
        username: root
        password: rootpass
    - list2:
      - key21:
        username: root
        password: rootpass
      - key22:
        username: root
        password: rootpass

Here is a Java code

@Component
@ConfigurationProperties(prefix = "server")
public class ServerProperties {

    private Map<String, List<Credential>> credentials = new HashMap<>();
    //getter and setter    

    public static class Credential {

        private String username;
        private String password;

        // Getter/Setter
    }
}

CodePudding user response：

If you want to have some nested things you need to initalize it and mark them as such. Also add getter/setter to this one:

@NestedConfigurationProperty
private final Map<String,List<Query>> units = new HashMap<>();