dgm.groovy

@Grab(group = "org.reflections", module = "reflections", version = "0.9.11")

import groovy.json.JsonOutput
import org.codehaus.groovy.reflection.GeneratedMetaMethod
import org.reflections.Reflections
import org.reflections.util.ConfigurationBuilder

def reflections = new Reflections(new ConfigurationBuilder().build())

def json = reflections.getSubTypesOf(GeneratedMetaMethod).collect {
    [name: it.name, allDeclaredConstructors: true, allPublicConstructors: true, allDeclaredMethods: true, allPublicMethods: true]
}

println JsonOutput.prettyPrint(JsonOutput.toJson(json))

More details https://e.printstacktrace.blog/2019/01/graalvm-groovy-grape-creating-native-image-of-standalone-script/