gradle クラスパスが長すぎて bootRun が動かない時、

build.gradle

task pathingJar(type Jar){
   dependsOn confogirations.runtime
   appendix = "pathing"
   doFirst {
      manifest {
         attributes "Class-Path": configurations.compile.files.collect {
            it.toURI().toURL().toString().replaceFirst("file:/", '/')
         }.join(" ")
      }
   }
}

bootRun {
   dependsOn pathingJar
   doFirst {
      classpath = files(sourceSets.main.output.files, pathingJar.archivePath)
   }
}

（参考）
https://stackoverflow.com/questions/5434482/how-can-i-create-a-pathing-jar-in-gradle

https://stackoverflow.com/questions/39756475/execution-of-gradle-bootrun-fails

https://qiita.com/loopsketch/items/eb7218d9bf60954abe30