DefaultValue annotation does not set a default value for parameter

Found the usage of DefaultValue annotation in tutorial code snippets (e.g. https://talend.github.io/component-runtime/main/0.0.4/tutorial-create-components-rest-api.html)
And in documentation:

@Documentation("Provide a default value the UI can use - only for primitive fields.")
...
public @interface DefaultValue {

but as clarified with igonchar currently the only way to provide a default value is to initialize the field explicitly:

private Boolean configurationValue = true;

Need to clarify what is the correct way to set default value and the purpose of DefaultValue annotation.