JavaFX - Loading images and memory problems

Question

I've got a problem with loading images into my application. I'm trying to make a simple image browser. On the left I've got a list of folders. After clicking on folder's name on the list images should appear on the right(flow pane). Every image is in a HBox with a border. But I'm getting error like this quickly:

java.lang.outofmemoryerror java heap space

I looked on task manager - if I load only 6 photos the app takes 500mb of memory! And another thing - if I change folder on the list the memory remains taken. While choosing another folder I'm creating new flowPane

flowPane = new FlowPane();

So the old one with all the ImageViews should be deleted by the garbage collector, right?

How can I manage images in my app effectively?

  for(int i = 0 ; i < zdjecia.length; i++){
        ImageView iv2 = new ImageView();
        Image image = new Image("file:"+zdjecia[i].getAbsolutePath());
         iv2.setImage(image);
         if( image.getHeight() > image.getWidth()){
                iv2.fitHeightProperty().bind(szerokoscZdjecia.multiply(0.8).subtract(6));
        }else
                iv2.fitWidthProperty().bind(szerokoscZdjecia.subtract(6));

         iv2.setPreserveRatio(true);
         iv2.setSmooth(true);
         iv2.setCache(false);

         String styl = "-fx-border-color: #b2b3b3;"
                 + "-fx-border-width: 2;";

         HBox boxNaFotke = new HBox();
         boxNaFotke.prefWidthProperty().bind(szerokoscZdjecia);
         boxNaFotke.prefHeightProperty().bind(szerokoscZdjecia.multiply(0.8));
         boxNaFotke.setAlignment(Pos.CENTER);
         boxNaFotke.setStyle(styl);
         boxNaFotke.getChildren().add(iv2);
         fotki.add(boxNaFotke);
         flowPane.getChildren().add(boxNaFotke);
    }

Answer 1

If you scale the Image using the constructor, the amount of the needed memory will be reduced dramatically.

Some example from the documentation:

// load an image and resize it to 100x150 without preserving its original aspect ratio
// The image is located in my.res package of the classpath
Image image2 = new Image("my/res/flower.png", 100, 150, false, false);

// load an image and resize it to width of 100 while preserving its
// original aspect ratio, using faster filtering method
// The image is downloaded from the supplied URL through http protocol
Image image3 = new Image("http://sample.com/res/flower.png", 100, 0, false, false);