Edit C:\Program Files\Java\jdk1.8.0_121\javafx\embed\swing\InputMethodSupport.java

/*
 * Copyright (c) 2013, 2014, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 */

package javafx.embed.swing;

import com.sun.javafx.collections.ObservableListWrapper;
import com.sun.javafx.scene.input.ExtendedInputMethodRequests;
import javafx.collections.ObservableList;
import javafx.geometry.Point2D;
import javafx.scene.input.InputMethodHighlight;
import javafx.scene.input.InputMethodTextRun;

import java.awt.Rectangle;
import java.awt.event.InputMethodEvent;
import java.awt.font.TextHitInfo;
import java.awt.im.InputMethodRequests;
import java.text.AttributedCharacterIterator;
import java.text.AttributedString;
import java.text.CharacterIterator;
import java.util.ArrayList;
import java.util.List;

/**
 * A utility class containing the functions to support Input Methods
 */

class InputMethodSupport {

public static class InputMethodRequestsAdapter implements InputMethodRequests {

private final javafx.scene.input.InputMethodRequests fxRequests;

public InputMethodRequestsAdapter(javafx.scene.input.InputMethodRequests fxRequests) {
            this.fxRequests = fxRequests;
        }

@Override
        public Rectangle getTextLocation(TextHitInfo offset) {
            Point2D result = fxRequests.getTextLocation(offset.getInsertionIndex());
            return new Rectangle((int)result.getX(), (int)result.getY(), 0, 0);
        }

@Override
        public TextHitInfo getLocationOffset(int x, int y) {
            int result = fxRequests.getLocationOffset(x, y);
            return TextHitInfo.afterOffset(result);
        }

@Override
        public int getInsertPositionOffset() {
            if (fxRequests instanceof ExtendedInputMethodRequests) {
                return ((ExtendedInputMethodRequests)fxRequests).getInsertPositionOffset();
            }
            return 0;
        }

@Override
        public AttributedCharacterIterator getCommittedText(int beginIndex, int endIndex, AttributedCharacterIterator.Attribute[] attributes) {
            String result = null;
            if (fxRequests instanceof ExtendedInputMethodRequests) {
                result = ((ExtendedInputMethodRequests)fxRequests).getCommittedText(beginIndex, endIndex);
            }
            if (result == null) result = "";
            return new AttributedString(result).getIterator();
        }

@Override
        public int getCommittedTextLength() {
            if (fxRequests instanceof ExtendedInputMethodRequests) {
                return ((ExtendedInputMethodRequests)fxRequests).getCommittedTextLength();
            }
            return 0;
        }

@Override
        public AttributedCharacterIterator cancelLatestCommittedText(AttributedCharacterIterator.Attribute[] attributes) {
            // Do not support the "Undo Commit" feature
            return null;
        }

@Override
        public AttributedCharacterIterator getSelectedText(AttributedCharacterIterator.Attribute[] attributes) {
            String text = fxRequests.getSelectedText();
            if (text == null) text = "";
            return new AttributedString(text).getIterator();
        }
    }

public static ObservableList<InputMethodTextRun> inputMethodEventComposed(String text, int commitCount)
    {
        List<InputMethodTextRun> composed = new ArrayList<>();

if (commitCount < text.length()) {
            // Create one single segment as UNSELECTED_RAW
            composed.add(new InputMethodTextRun(
                    text.substring(commitCount),
                    InputMethodHighlight.UNSELECTED_RAW));
        }
        return new ObservableListWrapper<>(composed);
    }

public static String getTextForEvent(InputMethodEvent e) {
        AttributedCharacterIterator text = e.getText();
        if (e.getText() != null) {
            char c = text.first();
            StringBuilder result = new StringBuilder();
            while (c != CharacterIterator.DONE) {
                result.append(c);
                c = text.next();
            }
            return result.toString();
        }
        return "";
    }
}

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