From the MPP guide: "By default, a sources JAR is ...

# multiplatform

[Shan]

From the MPP guide: "By default, a sources JAR is added to each publication in addition to its main artifact." Does this mean I don't need to include from(components["java"]) and artifact(tasks["sourcesJar"]) within my maven publication in my MPP build file?

[serebit]

Correct, so long as you add the generated maven publication it’ll include the sources jar

[Shan]

Do you happen to know what the generated publication names are? I can't seem to find it in the documentation and I need them for the signing plugin

[Shan]

going to try with just sign(publishing.publications) and see if that works for now

[h0tk3y]

The publication names match the target names. There is one publication per target that you define, plus, a publication named metadata for the built-in target of the same name, plus, if you publish a library with Gradle module metadata, there is a 'root' publication named kotlinMultiplatform (this one does not have a sources JAR).

You can get the existing publications from the project through debug output from the build script, like:
println(publishing.publications.names)

[h0tk3y]

sign(publishing.publications) should work just fine.

[h0tk3y]

There are sources JARs, indeed, but no Javadoc JARs that are required by Maven Central.

[h0tk3y]

Here's my sample project that is set up for publishing to Maven Central. Shame on me, I never tried to actually publish it to Maven Central, but I did set it up using the tutorials: https://github.com/h0tk3y/k-new-mpp-samples/tree/master/publish-to-maven-central