Setting up manifest in fat Jar: Multi-Release = true

[hmf]

Hello,

I uses the Mill command to generate the fat jar. The add works correctly however I get the warning:

WARNING: sun.reflect.Reflection.getCallerClass is not supported. This will impact performance.

According to Stackoverflow this seems to be an issue with the log4j logger using the new java 9+ modules: https://stackoverflow.com/questions/53049346/is-log4j2-compatible-with-java-11

The solution seems to be setting the manifest's Multi-Release = true. Below is an example using Maven:

plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-shade-plugin</artifactId>
    <version>3.2.1</version>
    <executions>
        <execution>
            <phase>package</phase>
            <goals>
                <goal>shade</goal>
            </goals>
            <configuration>
                <transformers>
                    <transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
                        <mainClass>foo.bar.Generate</mainClass>
                        <manifestEntries>
                            <Multi-Release>true</Multi-Release>
                        </manifestEntries>
                    </transformer>
                    <transformer implementation="org.apache.maven.plugins.shade.resource.ServicesResourceTransformer"/>
                </transformers>
            </configuration>
        </execution>
    </executions>
</plugin>

Can one do this in Mill? If so how? Couldn't find documentation on this, may have missed it.

TIA

[lefou]

Have you tried to add the manifest entry via manifest target?

override def manifest = super.manifest().add("Mulit-Release" -> "true")

[hmf]

I have not.

Ok, I see the update 0.5.1 - 2019-09-05 has Add ability to define JAR manifests.

Thank you for the super fast response.