SpringBoot yml format configuration does not override field default values

Customized configuration parameters can override the default value through the application.properties file, but cannot override the default value through application.yml。

TcpServiceRegistrarConfigurationProperties

@Configuration
@ConfigurationProperties(prefix = CONFIG_PREFIX)
@Data
public class TcpServiceRegistrarConfigurationProperties {
    public static final String CONFIG_PREFIX = "on.connect.service.registrar";
    public static final String DEFAULT_REGISTRAR_BIND_IP = "127.0.0.1";
    public static final int DEFAULT_REGISTRAR_BIND_PORT = 7000;
    private String ip = DEFAULT_REGISTRAR_BIND_IP;
    private int port = DEFAULT_REGISTRAR_BIND_PORT;
}

application.yml

on:
  connect:
    service:
      registrar:
        ip: localhost
        port: 7002

server:
  port: 8008

The customized parameters cannot override the default values, but server.port can.

application.properties

on.connect.service.registrar.port=7002
on.connect.service.registrar.ip=localhost

It can also be overridden through application.properties。

Comment From: hengboy

I use spring-boot v3.2.1 version

Comment From: hengboy

In the old version v2.7.x, this configuration can also override the default value

Comment From: wilkinsona

The YAML spec requires on to be converted to true. As a result, the properties defined in your YAML file are:

• true.connect.service.registrar.ip
• true.connect.service.registrar.port
• server.port

This conversion is performed by SnakeYAML. It can be avoided by quoting the on key:

'on':
  connect:
    service:
      registrar:
        ip: localhost
        port: 7002