public String getPreloaderClass(Artifact rootArtifact, Project project) {
    final Artifact artifact = getPreloaderArtifact(rootArtifact, project);
    if (artifact != null) {
      final JavaFxPreloaderArtifactProperties properties =
        (JavaFxPreloaderArtifactProperties)artifact.getProperties(JavaFxPreloaderArtifactPropertiesProvider.getInstance());
      return properties.getPreloaderClass();
    }
    return null;
  }
public String getPreloaderClass(Artifact rootArtifact, Project project)