Multiple fat jars in gradle(kotlin dsl)

build.gradle.kts

tasks {
    task("buildClient", type=Jar::class) {
        archiveFileName.set("client.jar")
        manifest {
            attributes(mapOf("Main-Class" to "RunClientKt"))
        }
        isZip64 = true
        from (project.configurations.runtimeClasspath.get().map {if (it.isDirectory) it else zipTree(it) })
        with(getByName("jar") as CopySpec)
    }

    task("buildServer", type=Jar::class) {
        archiveFileName.set("server.jar")
        manifest {
            attributes(mapOf("Main-Class" to "RunServerKt"))
        }
        isZip64 = true
        from (project.configurations.runtimeClasspath.get().map {if (it.isDirectory) it else zipTree(it) })
        with(getByName("jar") as CopySpec)
    }
}