Edit C:\Program Files\Java\jdk1.8.0_121\com\sun\javafx\css\CssError.java

/*
 * Copyright (c) 2012, 2014, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
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 */

package com.sun.javafx.css;

import javafx.css.CssMetaData;
import javafx.css.Styleable;
import javafx.scene.Scene;

import java.lang.ref.Reference;
import java.lang.ref.WeakReference;

/**
 * Encapsulate information about the source and nature of errors encountered
 * while parsing CSS or applying styles to Nodes.
 */
public class CssError {

// RT-20643 - hold a ref so CssError doesn't leak Scene.
    private static Reference<Scene> SCENE_REF;

/**
     * Set the static scene variable. This scene will be set on all CssErrors
     * generated after the call is made. The argument may be null. Null should
     * be passed when the code exits a method from which CssErrors may be
     * created. This is intended internal use and should not be called from
     * outside the css code.
     */
    public static void setCurrentScene(Scene scene) {

// Treat as a no-op if noone cares about CssErrors
        if (StyleManager.getErrors() == null) return;

if (scene != null) {
            // don't make new ref for same scene
            final Scene oldScene = SCENE_REF != null ? SCENE_REF.get() : null;
            if (oldScene != scene) {
                SCENE_REF = new WeakReference<Scene>(scene);
            }
        } else {
            SCENE_REF = null;
        }
    }

/** @return The error message from the CSS code. */
    public final String getMessage() {
        return message;
    }

public CssError(String message) {
        this.message = message;
        // RT-20643
        this.sceneRef = SCENE_REF;
    }

/**
     * @return The Scene in which this error occurred, if known, or null.
     */
    public Scene getScene() {
        return sceneRef != null ? sceneRef.get() : null;
    }

// RT-20643 - track the scene that this error belongs to
    // Note that CssError has the potential to leak Scene so the Scene
    // variable is held as a Reference.
    private final Reference<Scene> sceneRef;
    protected final String message;

@Override
    public String toString() {
        return "CSS Error: " + message;
    }

/** Encapsulate errors arising from parsing of stylesheet files */
    public final static class StylesheetParsingError extends CssError {

public StylesheetParsingError(String url, String message) {
            super(message);
            this.url = url;
        }

public String getURL() {
            return url;
        }

private final String url;

@Override
        public String toString() {
            final String path = url != null ? url : "?";
            // TBD: i18n
            return "CSS Error parsing " + path + ": " + message;
        }

}

/** Encapsulate errors arising from parsing of Node's style property */
    public final static class InlineStyleParsingError extends CssError {

public InlineStyleParsingError(Styleable styleable, String message) {
            super(message);
            this.styleable = styleable;
        }

public Styleable getStyleable() {
            return styleable;
        }

private final Styleable styleable;

@Override
        public String toString() {
            final String inlineStyle = styleable.getStyle();
            final String source = styleable.toString();
            // TBD: i18n
            return "CSS Error parsing in-line style \'" + inlineStyle +
                    "\' from " + source + ": " + message;
        }
    }

/**
     * Encapsulate errors arising from parsing when the style is not
     * an in-line style nor is the style from a stylesheet. Primarily to
     * support unit testing.
     */
    public final static class StringParsingError extends CssError {

public StringParsingError(String style, String message) {
            super(message);
            this.style = style;
        }

public String getStyle() {
            return style;
        }

private final String style;

@Override
        public String toString() {
            // TBD: i18n
            return "CSS Error parsing \'" + style + ": " + message;
        }
    }

/** Encapsulates errors arising from applying a style to a Node. */
    public final static class PropertySetError extends CssError {

public PropertySetError(CssMetaData styleableProperty,
                Styleable styleable, String message) {
            super(message);
            this.styleableProperty = styleableProperty;
            this.styleable = styleable;
        }

public Styleable getStyleable() {
            return styleable;
        }

public CssMetaData getProperty() {
            return styleableProperty;
        }

private final CssMetaData styleableProperty;
        private final Styleable styleable;

}
}

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