Edit C:\Program Files\Java\jdk1.8.0_121\javafx\scene\layout\BackgroundConverter.java

/*
 * Copyright (c) 2012, 2013, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
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 */

package javafx.scene.layout;

import com.sun.javafx.css.StyleConverterImpl;
import com.sun.javafx.css.StyleManager;
import com.sun.javafx.scene.layout.region.RepeatStruct;
import java.util.Map;
import javafx.css.CssMetaData;
import javafx.css.ParsedValue;
import javafx.css.StyleConverter;
import javafx.css.Styleable;
import javafx.geometry.Insets;
import javafx.scene.image.Image;
import javafx.scene.paint.Paint;

/**
 * Converts the CSS for -fx-background items into a Background.
 */
class BackgroundConverter extends StyleConverterImpl<ParsedValue[], Background> {

static final StyleConverter<ParsedValue[], Background> INSTANCE = new BackgroundConverter();

@Override public Background convert(Map<CssMetaData<? extends Styleable, ?>,Object> convertedValues) {
        final Paint[] fills = (Paint[]) convertedValues.get(Background.BACKGROUND_COLOR);
        final String[] imageUrls = (String[]) convertedValues.get(Background.BACKGROUND_IMAGE);
        final boolean hasFills = fills != null && fills.length > 0;
        final boolean hasImages = imageUrls != null && imageUrls.length > 0;

// If there are neither background fills nor images, then there is nothing for us to construct.
        if (!hasFills && !hasImages) return null;

// Iterate over all of the fills, and create BackgroundFill objects for each.
        BackgroundFill[] backgroundFills = null;
        if (hasFills) {
            backgroundFills = new BackgroundFill[fills.length];

Object tmp = convertedValues.get(Background.BACKGROUND_INSETS);
            final Insets[] insets = tmp == null ? new Insets[0] : (Insets[]) tmp;

tmp = convertedValues.get(Background.BACKGROUND_RADIUS);
            final CornerRadii[] radii = tmp == null ? new CornerRadii[0] : (CornerRadii[]) tmp;

final int lastInsetsIndex = insets.length - 1;
            final int lastRadiiIndex = radii.length - 1;
            for (int i=0; i<fills.length; i++) {
                Insets in = insets.length > 0 ? insets[i <= lastInsetsIndex ? i : lastInsetsIndex] : Insets.EMPTY;
                CornerRadii ra = radii.length > 0 ? radii[i <= lastRadiiIndex ? i : lastRadiiIndex] : CornerRadii.EMPTY;
                backgroundFills[i] = new BackgroundFill(fills[i], ra, in);
            }
        }

// Iterate over all of the image, and create BackgroundImage objects for each.
        BackgroundImage[] backgroundImages = null;
        if (hasImages) {
            // TODO convert image urls into image objects!
            backgroundImages = new BackgroundImage[imageUrls.length];

Object tmp = convertedValues.get(Background.BACKGROUND_REPEAT);
            final RepeatStruct[] repeats = tmp == null ? new RepeatStruct[0] : (RepeatStruct[]) tmp;

tmp = convertedValues.get(Background.BACKGROUND_POSITION);
            final BackgroundPosition[] positions = tmp == null ? new BackgroundPosition[0] : (BackgroundPosition[]) tmp;

tmp = convertedValues.get(Background.BACKGROUND_SIZE);
            final BackgroundSize[] sizes = tmp == null ? new BackgroundSize[0] : (BackgroundSize[]) tmp;

final int lastRepeatIndex = repeats.length - 1;
            final int lastPositionIndex = positions.length - 1;
            final int lastSizeIndex = sizes.length - 1;
            for (int i = 0; i < imageUrls.length; i++) {
                // RT-21335: skip background and border images whose image url is null
                if (imageUrls[i] == null) continue;

final Image image = StyleManager.getInstance().getCachedImage(imageUrls[i]);
                if (image == null) continue;

final RepeatStruct repeat = (repeats.length > 0) ?
                        repeats[i <= lastRepeatIndex ? i : lastRepeatIndex] : null; // min
                final BackgroundPosition position = (positions.length > 0) ?
                        positions[i <= lastPositionIndex ? i : lastPositionIndex] : null; // min
                final BackgroundSize size = (sizes.length > 0) ?
                        sizes[i <= lastSizeIndex ? i : lastSizeIndex] : null; // min
                backgroundImages[i] = new BackgroundImage(image,
                        repeat == null ? null : repeat.repeatX,
                        repeat == null ? null : repeat.repeatY,
                        position, size);
            }
        }

// Give the background fills and background images to a newly constructed BackgroundConverter,
        // and return it.
        return new Background(backgroundFills, backgroundImages);
    }
}

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