pom

from wants a file or path. What you're feeding it, generatePomFileForMavenJavaPublication is a task, which is most definitely not a file or path, so that's not going to work.

What you can do is make generatePomFileForMavenJavaPublication a prerequisite for jar and pick up the pom it creates in your build directory.

Something like the following should accomplish this:

jar {
    dependsOn generatePomFileForMavenJavaPublication
    from("$builddir/pom.xml") //Or whatever path it goes to in the generate task.
    into("META-INF/maven/$project.group/$project.name")
}

http://buransky.com/scala/publish-jar-artifact-using-gradle-to-artifactory/ http://buransky.com/scala/publish-jar-artifact-using-gradle-to-artifactory/