spring-configuration-metadata.json is missing for additional-spring-configuration-metadata.json after switching from @Configuration to @AutoConfiguration

[marbon87]

We are providing custom AutoConfigurations for company specific configurations and have a few maven modules that contain only auto-configurations and spring-configuration-metadata.json files.
After updating to Spring Boot 2.7 and switching from spring.factories+@Configuration to @AutoConfiguration the file spring-configuration-metadata.json is not generated anymore with the content of additional-spring-configuration-metadata.json.
The reason is that org.springframework.boot.configurationprocessor.ConfigurationMetadataAnnotationProcessor is excuted only if the following annotations are present:

@SupportedAnnotationTypes({ ConfigurationMetadataAnnotationProcessor.CONFIGURATION_PROPERTIES_ANNOTATION,
        ConfigurationMetadataAnnotationProcessor.CONTROLLER_ENDPOINT_ANNOTATION,
        ConfigurationMetadataAnnotationProcessor.ENDPOINT_ANNOTATION,
        ConfigurationMetadataAnnotationProcessor.JMX_ENDPOINT_ANNOTATION,
        ConfigurationMetadataAnnotationProcessor.REST_CONTROLLER_ENDPOINT_ANNOTATION,
        ConfigurationMetadataAnnotationProcessor.SERVLET_ENDPOINT_ANNOTATION,
        ConfigurationMetadataAnnotationProcessor.WEB_ENDPOINT_ANNOTATION,
        "org.springframework.context.annotation.Configuration" })
public class ConfigurationMetadataAnnotationProcessor extends AbstractProcessor {

Before switching to @AutoConfiguration the @Configuration was present and the processor was executed. I am not sure what the best fix would be.
As @SupportedAnnotationTypes does not seem to consider inherited annotations the easiest fix would be to add @AutoConfiguration to the supported annotation types.
But i do not see why any of the annotations would be necessary to enable ConfigurationMetadataAnnotationProcessor as the presents of additional-spring-configuration-metadata.json should enable processing.

[wilkinsona]

@marbon87 Thanks for reporting this. Just to make sure that I've understood the problem, am I right in thinking that you don't have any @ConfigurationProperties-annotated types in the affected modules are you're relying purely on manual metadata?

[marbon87]

@wilkinsona that's correct.
Our modules look like this:

├── pom.xml
├── src
│   ├── main
│   │   ├── java
│   │   │   └── com
│   │   │       └── example
│   │   │           └── demo
│   │   │               └── TestAutoConfiguration.java
│   │   └── resources
│   │       └── META-INF
│   │           └── additional-spring-configuration-metadata.json

@AutoConfiguration
@Import(....)
public class TestAutoConfiguration {
}