Automatically filter `additional-spring-configuration-metadata.json` from Spring Boot-built archives

[wangliang181230]

Exclude additional-spring-configuration-metadata.json from the jars.
This file is not required.

[bclozel]

This file is packaged with your project to provide additional information to developers when working with your library, as explained in our reference documentation.

Not packaging it with the library would make that file useless.

[bclozel]

@wilkinsona pointed out that this information is indeed merged in the main metadata file.

I’m not sure how we can prevent this file from being packaged with the library. Is there anything we can do here? Maybe document how to filter out this file in the build?

[wangliang181230]

Can put the additional-spring-configuration-metadata.json in the src/main/xxx directory? Not the /src/main/resources/META-INF directory.

[wangliang181230]

Outside the /src/main/resources directory, I think it will not be packaged into the library.

[bclozel]

I'm not sure the annotation processor will be able to find these files if they're not shipped as resources.

[wangliang181230]

Can the Maven plugin merge the metadata?

[wangliang181230]

@bclozel The maven-jar-plugin can exclude additional, and is merged to the main metadata.

<build>
    <plugins>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-jar-plugin</artifactId>
            <version>3.2.0</version>
            <configuration>
                <excludes>
                    <exclude>**/META-INF/additional-spring-configuration-metadata.json</exclude>
                </excludes>
            </configuration>
        </plugin>
    </plugins>
</build>