ClientBoot.java

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package socius.app;

import java.io.IOException;
import java.util.logging.Level;
import java.util.logging.Logger;
import javafx.application.Application;
import javafx.application.Platform;
import javafx.event.EventHandler;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.stage.Stage;
import javafx.stage.WindowEvent;

/**
 *
 * @author Ana
 */
public class ClientBoot extends Application {

    private String redirecionar = "/socius/telas/login/login.fxml";
    private Parent root;
    private Scene scene;
    private Stage stage;
    private static ClientBoot instance;
    private boolean resizable = false;

    public static ClientBoot getInstance() {
        if (instance == null) {
            if (instance == null) {
                instance = new ClientBoot();
            }
        }
        return instance;
    }

    public Scene getScene() {
        return scene;
    }

    public Stage getStage() {
        return stage;
    }

    private void abrir() throws InterruptedException {
        //uso o mesmo palco e mudo de cena
        try {
            root = FXMLLoader.load(getClass().getResource(redirecionar));
            scene = new Scene(root);
            stage.setScene(scene);
            stage.setResizable(resizable);
            //se não estiver na tela de login o stage possuira o evento 
            //para on close que deslog o cliente do servidor
            Platform.setImplicitExit(true);
            
            stage.setOnCloseRequest(new EventHandler<WindowEvent>() {

                @Override
                public void handle(WindowEvent t) {
                    Platform.exit();
                    System.exit(0);
                }
            });
            stage.show();
        } catch (IOException ex) {
            Logger.getLogger(ClientBoot.class.getName()).log(Level.SEVERE, null, ex);
        }
    }

    private void esconder() {
        stage.hide();
    }

    public void telaPrincipal() {
        resizable = true;
        redirecionar = "/socius/telas/principal/principal.fxml";
    }

    public void telaLogin() {
        resizable = false;
        redirecionar = "/socius/telas/login/login.fxml";
    }

    public void telaCadastro() {
        resizable = false;
        redirecionar = "/socius/telas/cadastro/cadastro.fxml";
    }

    @Override
    public void start(Stage stage) throws Exception {
        this.stage = stage;
        abrir();
    }
    
    public static void main(String[] args) {
        launch(args);
    }
}