The test below loads an image using IIO. Loading finishes normally, but the listener's imageLoadMetaData method is never called.
Put the attached bikes.bmp into /tmp directory.


import com.sun.javafx.iio.ImageLoadListener;
import com.sun.javafx.iio.ImageLoader;
import com.sun.javafx.iio.ImageMetadata;
import com.sun.javafx.iio.ImageStorage;
import java.io.FileInputStream;
import java.io.InputStream;
import javafx.application.Application;
import javafx.stage.Stage;


public class ImageLoaderTest extends Application implements ImageLoadListener {
    
    public static void main(String[] args) {
        launch(ImageLoaderTest.class, args);
    }

    @Override public void start(Stage stage) {
        try {
            InputStream in = new FileInputStream("/tmp/bikes.bmp");
            ImageStorage.loadAll(in, this, 0, 0, true, false);
            System.out.println("Image loaded");
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
        
    @Override public void imageLoadProgress(ImageLoader l, float p) {
    }
    @Override public void imageLoadWarning(ImageLoader l, String warning) {
    }
    @Override public void imageLoadMetaData(ImageLoader l, ImageMetadata metadata) {
        System.out.printf("Image size is %dx%d\n", metadata.imageWidth, metadata.imageHeight);
    }
}