Change:
<ins> { lib, stdenv, fetchFromGitHub, jdk, gradleGen, makeDesktopItem, copyDesktopItems, perl, writeText, runtimeShell, makeWrapper, glib, wrapGAppsHook }: let # The default one still uses jdk8 (#89731) gradle = (gradleGen.override (old: { java = jdk; })).gradle_latest; pname = "scenebuilder"; version = "15.0.1"; src = fetchFromGitHub { owner = "gluonhq"; repo = pname; rev = version; sha256 = "0dqlpfgr9qpmk62zsnhzw4q6n0swjqy00294q0kb4djp3jn47iz4"; }; deps = stdenv.mkDerivation { name = "${pname}-deps"; inherit src; nativeBuildInputs = [ jdk perl gradle ]; buildPhase = '' export GRADLE_USER_HOME=$(mktemp -d); gradle --no-daemon build -x test ''; # Mavenize dependency paths # e.g. org.codehaus.groovy/groovy/2.4.0/{hash}/groovy-2.4.0.jar -> org/codehaus/groovy/groovy/2.4.0/groovy-2.4.0.jar installPhase = '' find $GRADLE_USER_HOME/caches/modules-2 -type f -regex '.*.(jar|pom)'  | perl -pe 's#(.*/([^/]+)/([^/]+)/([^/]+)/[0-9a-f]{30,40}/([^/s]+))$# ($x = $2) =~ tr|.|/|; "install -Dm444 $1 $out/$x/$3/$4/$5" #e'  | sh ''; outputHashAlgo = "sha256"; outputHashMode = "recursive"; outputHash = "0n93kb8pajlbidvdrsf3hwcwqzvgdm6dnly7wvk3vpargx6k7y1r"; }; # Point to our local deps repo gradleInit = writeText "init.gradle" '' settingsEvaluated { settings -> settings.pluginManagement { repositories { clear() maven { url '${deps}' } } } } logger.lifecycle 'Replacing Maven repositories with ${deps}...' gradle.projectsLoaded { rootProject.allprojects { buildscript { repositories { clear() maven { url '${deps}' } } } repositories { clear() maven { url '${deps}' } } } } ''; desktopItem = makeDesktopItem { name = "Scene Builder"; exec = "scenebuilder"; icon = "scenebuilder"; comment = "A visual, drag'n'drop, layout tool for designing JavaFX application user interfaces."; desktopName = pname; mimeType = "application/java;application/java-vm;application/java-archive"; categories = "Development"; }; in stdenv.mkDerivation rec { inherit pname src version; nativeBuildInputs = [ jdk gradle makeWrapper glib wrapGAppsHook ]; dontWrapGApps = true; # prevent double wrapping buildPhase = '' runHook preBuild export GRADLE_USER_HOME=$(mktemp -d) gradle -PVERSION=${version} --offline --no-daemon --info --init-script ${gradleInit} build -x test runHook postBuild ''; installPhase = '' runHook preInstall mkdir -p $out/bin $out/share/{${pname},icons/hicolor/128x128/apps} cp app/build/libs/SceneBuilder-${version}-all.jar $out/share/${pname}/${pname}.jar cp app/build/resources/main/com/oracle/javafx/scenebuilder/app/SB_Logo.png $out/share/icons/hicolor/128x128/apps/scenebuilder.png runHook postInstall ''; postFixup = '' makeWrapper ${jdk}/bin/java $out/bin/${pname} --add-flags "-jar $out/share/${pname}/${pname}.jar" "''${gappsWrapperArgs[@]}" ''; desktopItems = [ desktopItem ]; meta = with lib; { description = "A visual, drag'n'drop, layout tool for designing JavaFX application user interfaces."; homepage = "https://gluonhq.com/products/scene-builder/"; license = licenses.bsd3; maintainers = with maintainers; [ wirew0rm ]; platforms = platforms.all; }; } </ins>

Discussion:
Project description Scene Builder is a drag n drop layout tool for designing JavaFX application user interfaces. It is now distributed under 3-clause BSD License, without the need of registration or manually accept EULAs. There was a pull request when it had not been open-sourced (). Now it would be easier to package. Metadata homepage URL: source URL: license: bsd3 platforms: unix
I marked this as stale due to inactivity. &rarr;
I am still looking forward to this one.
If you're still interested, you could build scenebuilder from my PR linked above, test if it works for you or if I missed anything and report your results there.