Scene.fxml

<?xml version="1.0" encoding="UTF-8"?>

<?import javafx.scene.layout.AnchorPane?>
<?import javafx.scene.control.*?>
<?import com.lynden.gmapsfx.GoogleMapView?>

<AnchorPane id="AnchorPane" prefHeight="500" prefWidth="750" xmlns:fx="http://javafx.com/fxml/1" xmlns="http://javafx.com/javafx/8.0.65" fx:controller="com.mycompany.gmapstestproject.FXMLController">
    <children>
        <GoogleMapView fx:id="mapView" prefHeight="500.0" prefWidth="700.0" AnchorPane.bottomAnchor="0" AnchorPane.leftAnchor="0.0" AnchorPane.rightAnchor="0" AnchorPane.topAnchor="0.0"/>
        <TextField fx:id="addressTextField" onAction="#addressTextFieldAction" prefHeight="27.0" prefWidth="274.0" promptText="Address" AnchorPane.leftAnchor="10" AnchorPane.topAnchor="10" />
    </children>
 </AnchorPane>