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I add the following to Grails Plugin build files:

tasks.named('bootJar') {
    enabled = false // Don't need a bootJar for plugin
}
tasks.named('jar', Jar) {
    enabled = true // Need a jar for plugin
    archiveClassifier = '' // Don't want the '-plain' classifier
}

I think we should add this by default from the CLI application or the Grails Gradle Plugin. However, recently I was trying to set remove the classier from one of the plugin and encountered some issues with building project.