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I'm looking for a library that allows me to load images in the same way as Picasso or Glide for Android/Java, I'm working in a desktop application using JavaFX 2 and image loading is clogging the main thread. I thought about creating a custom functionality from scratch, but I suppose they are a mature set of tool to avoid extra work. I had tried to load the image inside its thread, but it is not working.

@Override
public void initialize(URL url, ResourceBundle resourceBundle) 
 final String thumbnail = data.getSong().getThumbnail();

 Runnable runnable = () -> 
 Image image = new Image(thumbnail);
 imageView.setImage(image);
 ;
 runnable.run();

For repetitive images image loading I would recommend using one of javafx animation tools.
PauseTransition is one option:

import javafx.animation.PauseTransition;
import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;
import javafx.util.Duration;

public class SlideShow extends Application

 private static int counter =0;
 private ImageView iv;
 private Image[] images;
 private Button swapImage;

 private final String[] urls = 
 "https://emojipedia-us.s3.dualstack.us-west-1.amazonaws.com/thumbs/160/lg/57/tropical-fish_1f420.png",
 "https://www.shareicon.net/data/128x128/2015/03/28/14104_animal_256x256.png",
 "https://cdn1.iconfinder.com/data/icons/DarkGlass_Reworked/128x128/apps/gnome-fish.png",
 "http://www.iconsalot.com/asset/icons/freepik/pet-shop-13/128/010-fish-2-icon.png"
 ;

 @Override
 public void start(Stage primaryStage) throws Exception
 
 images = new Image[urls.length];
 for(int i=0; i< urls.length; i++) 
 images[i] = new Image(urls[i], true);
 

 iv = new ImageView(images[counter++]);
 swapImage = new Button("Start");
 swapImage.setOnAction(e->update());
 BorderPane root = new BorderPane(iv);
 root.setBottom(new StackPane(swapImage));
 Scene scene = new Scene(root,200,200);
 primaryStage.setScene(scene);
 primaryStage.show();
 

 private void update() 

 swapImage.setDisable(true);
 PauseTransition pause = new PauseTransition(Duration.seconds(1));
 pause.setOnFinished(event ->
 swapImage();
 pause.play();
 );
 pause.play(); 
 

 private void swapImage() 
 counter = counter % images.length;
 iv.setImage(images[counter++]);
 

 public static void main(String[] args) 
 Application.launch(args);
 

Alternatively you could use Timeline by modifying update() :

private void update() 

 swapImage.setDisable(true);
 KeyFrame keyFrame = new KeyFrame(
 Duration.seconds(1),
 event -> swapImage()
 );

 Timeline timeline = new Timeline();
 timeline.setCycleCount(Animation.INDEFINITE);
 timeline.getKeyFrames().add(keyFrame);
 timeline.play();