jshellWithClassPaths.gradle

task showClassPaths(type: Exec) {
    def classFiles = []
    configurations.compileClasspath.each { classFiles.add(it.toString()) }
    def classPaths = classFiles.collect { "--class-path ${it}" }.join(" ")
    executable "bash"
    args "-c", "echo 'jshell ${classPaths}'"
}