FULL PRODUCT VERSION :
java version "1.8.0_65"
Java(TM) SE Runtime Environment (build 1.8.0_65-b17)
Java HotSpot(TM) 64-Bit Server VM (build 25.65-b01, mixed mode)

ADDITIONAL OS VERSION INFORMATION :
Microsoft Windows [Version 6.1.7601]

A DESCRIPTION OF THE PROBLEM :
We have a swing application. It uses JFXPanel to embed some JavaFX components (mainly WebView). When we drag something from swing or an external application and try to drop on a JavaFX component inside the JFXPanel, it doesn't accept the drop.

REGRESSION. Last worked in version 7u76

ADDITIONAL REGRESSION INFORMATION:
java version "1.7.0"
Java(TM) SE Runtime Environment (build 1.7.0-b147)
Java HotSpot(TM) 64-Bit Server VM (build 21.0-b17, mixed mode)

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Run the sample application drag the "Drag me" label and try to drop it in the second text box.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
The text box excepts the drop.
ACTUAL -
The text box doesn't except the drop.

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
import javafx.application.Platform;
import javafx.embed.swing.JFXPanel;
import javafx.scene.Scene;
import javafx.scene.control.TextField;
import javafx.scene.layout.HBox;
import javafx.scene.layout.Priority;

import javax.swing.*;

import java.awt.FlowLayout;
import java.awt.Point;
import java.awt.datatransfer.StringSelection;
import java.awt.datatransfer.Transferable;
import java.awt.dnd.DnDConstants;
import java.awt.dnd.DragSource;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;

public class DnDTest {

  public static void main(final String... pArguments) {
    SwingUtilities.invokeLater(new Runnable() {
      @Override
      public void run() {
        JFrame frame = new JFrame("DnDTest");
        frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);

        JRootPane rootPane = frame.getRootPane();
        rootPane.setLayout(new FlowLayout());
        JLabel label = new JLabel("Drag me");
        label.setTransferHandler(new TransferHandler() {
          @Override
          protected Transferable createTransferable(final JComponent pComponent) {
            return new StringSelection("Drag text");
          }

          @Override
          public int getSourceActions(final JComponent pComponent) {
            return DnDConstants.ACTION_COPY;
          }
        });
        MouseAdapter dragGestureRecognizer = new MouseAdapter() {
          private Point mPoint;

          @Override
          public void mousePressed(MouseEvent pEvent) {
            mPoint = pEvent.getPoint();
          }

          @Override
          public void mouseReleased(MouseEvent pEvent) {
            mPoint = null;
          }

          @Override
          public void mouseDragged(MouseEvent pEvent) {
            if (mPoint == null) {
              mPoint = pEvent.getPoint();
            }
            double distance = pEvent.getPoint().distance(mPoint);
            if (distance > DragSource.getDragThreshold()) {
              JComponent component = (JComponent) pEvent.getComponent();
              TransferHandler transferHandler = component.getTransferHandler();
              transferHandler.exportAsDrag(component, pEvent, DnDConstants.ACTION_COPY);
            }
          }
        };
        label.addMouseListener(dragGestureRecognizer);
        label.addMouseMotionListener(dragGestureRecognizer);
        rootPane.add(label);
        rootPane.add(new JTextField("Drop works here"));

        final JFXPanel panel = new JFXPanel();
        Platform.runLater(new Runnable() {
          @Override
          public void run() {
            TextField textField = new TextField("Drop doesn't work here");
            HBox hBox = new HBox();
            HBox.setHgrow(textField, Priority.ALWAYS);
            Scene scene = new Scene(hBox);
            hBox.getChildren().add(textField);
            panel.setScene(scene);
          }
        });
        rootPane.add(panel);

        frame.setSize(500, 400);
        frame.setLocationRelativeTo(null);
        frame.setVisible(true);
      }
    });
  }
}

---------- END SOURCE ----------