In Linux (Gnome 3) if I drop files onto my JavaFX application any files that have spaces in the path are url escaped with %20 in place of any spaces. These files do not pass a Files.exists() test because of the escaped spaces.

Please run the provided test code in Gnome and drag a group of files onto the opened Stage. Be sure to include some files that have spaces and some that do not.

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import java.io.File;
import java.util.ArrayList;

import javafx.application.Application;
import javafx.event.EventHandler;
import javafx.scene.Scene;
import javafx.scene.control.ListView;
import javafx.scene.input.DragEvent;
import javafx.scene.input.Dragboard;
import javafx.scene.input.TransferMode;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;

public class DropFilesTest extends Application {

@Override
public void start(Stage primaryStage) throws Exception {

primaryStage.centerOnScreen();
primaryStage.setHeight(200);
primaryStage.setWidth(550);

final ListView<String> list = new ListView<>();
list.setOnDragOver(new EventHandler<DragEvent>() {
@Override public void handle(DragEvent event) {
if ( event.getDragboard().hasFiles() ) {
event.acceptTransferModes(TransferMode.COPY);
}
}
});
list.setOnDragDropped( new EventHandler<DragEvent>() {
@Override public void handle(DragEvent event) {
Dragboard db = event.getDragboard();
if ( db.hasFiles() ) {
ArrayList<String> newItems = new ArrayList<>();
for ( File f : db.getFiles() ) {
newItems.add("\"" + f + "\"" + " exists: " +f.exists());
}
list.getItems().setAll(newItems);
event.setDropCompleted(true);
event.consume();
}
event.setDropCompleted(false);
}
});

primaryStage.setScene( new Scene(new StackPane(list)) );
primaryStage.show();

}

public static void main(String[] args) throws Exception {
launch(args);
}

}