@ConfigurationProperties referencing properties that themselves reference other properties

Question

project.name=my-project
base.url=http://localhost:8080
cas.url=http://my-server:8010/cas
cas.callback.url=${base.url}/${project.name}

Basically I want to use the above in a spring-boot ConfigurationProperties but the casCallbackUrl is always null.

@Component
@ConfigurationProperties(prefix = "cas")
@Getter
@Setter
public class CasSettings {

    @NotBlank
    private String url; //this is resolved correctly

    @NotBlank
    private String callbackUrl; //callbackUrl is null

}

update

Well I got it working by camelCasing the property names, but according to the documentation you should be able to use dot notation for property names.

from:

cas.callback.url=${base.url}/${project.name}

to:

cas.callbackUrl=${base.url}/${project.name}

Why is spring-boot not picking up the dot notation?

Answer 1

The dot represents a separate object within the configuration properties object. cas.callback-url would work.