Java-Spring Autowired分配null

Question

I'm trying to to use spring xml configuration (only for autowiring some objects - business logic classes and jdbcTemplate) with javafx but whenever I'm using @Autowired the object is getting null.

Here's my code of Main class :

@Component
public class App extends Application {

    public static ApplicationContext appContext;
    public static Stage window;

    static {
        appContext = new ClassPathXmlApplicationContext("spring//beans.xml");
    }

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

    @Override
    public void start(Stage primaryStage) throws Exception {
        System.out.println("test1");
        window = primaryStage;
        Parent root = FXMLLoader.load(getClass().getClassLoader().getResource("scenes/Login.fxml"));
        Scene scene = new Scene(root);
        primaryStage.setTitle(Titles.APPLICATION_TITLE);
        primaryStage.setScene(scene);
        primaryStage.show();
        window.setOnCloseRequest(e -> closeProgram(e));
        System.out.println("test2");
    }

    private void closeProgram(WindowEvent windowEvent) {
        try {
            windowEvent.consume();
            CommonUtility.openNewWindow("ConfirmExit", Titles.APPLICATION_TITLE);
        } catch (IOException e) {
            e.printStackTrace();
        }
}
}

Spring configuration file, beans.xml :

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"
    xmlns:aop="http://www.springframework.org/schema/aop"
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
                        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd
                        http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.0.xsd">
    <context:annotation-config />
    <context:component-scan base-package="in.csitec.sp" />

    <import resource="classpath:database-config1.xml" />

    <bean id="taskExecutor"
        class="org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor">
        <property name="corePoolSize" value="5" />
        <property name="maxPoolSize" value="20" />
        <property name="queueCapacity" value="25" />
        <property name="WaitForTasksToCompleteOnShutdown" value="true" />
    </bean>


</beans>

Login Controller :

@Component
public class LoginController implements Initializable {


    @FXML
    private Label statusLabel;

    @FXML
    private TextField usernameTextField, passwordTextField;

    @FXML
    private Button loginButton;

    @FXML
    private ProgressBar progressBar;

    private Task<Object> loginTask;

    public static String loggedInUser;

    @Autowired
    LoginManager loginManager;

    @Override
    public void initialize(URL location, ResourceBundle resources) {


    }

    public void onLoginButtonClick(ActionEvent actionEvent){
        if (usernameTextField.getText().isEmpty()) {
            statusLabel.setText(Messages.EMPTY_USERNAME);
            NotificationManager.showNotification(Titles.APPLICATION_TITLE, Messages.EMPTY_USERNAME);
            return;
        }
        if (passwordTextField.getText().isEmpty()) {
            statusLabel.setText(Messages.EMPTY_PASSWORD);
            NotificationManager.showNotification(Titles.APPLICATION_TITLE, Messages.EMPTY_PASSWORD);
            return;
        }
        loginButton.setDisable(true);

        progressBar.setProgress(0);

        loginTask = createLoginTask();

        progressBar.progressProperty().unbind();
        progressBar.progressProperty().bind(loginTask.progressProperty());


        loginTask.messageProperty().addListener(new ChangeListener<String>() {

            @Override
            public void changed(ObservableValue<? extends String> observable, String oldValue, String newValue) {

                if(LoginManager.statusCode.equalsIgnoreCase("1")){
                    System.out.println("Invalid username or password.");
                    progressBar.progressProperty().unbind();
                    loginButton.setDisable(false);
                    return;
                }
                System.out.println("Logged in successfully");
                progressBar.progressProperty().unbind();
                loginButton.setDisable(false);
            }
        });
        new Thread(loginTask).start();
    }

    private Task<Object> createLoginTask() {

        return new Task<Object>() {

            @Override
            protected Object call() throws Exception {
                try{
                    Map<String, String> requestMap = new HashMap<>();
                    requestMap.put(Constants.USERNAME, usernameTextField.getText());
                    requestMap.put(Constants.PASSWORD, passwordTextField.getText());
                    loginManager.loginManager(requestMap);
                    updateProgress(100, 100);
                    updateMessage("Got Response");
                }catch(Exception e){
                    System.out.println("checkin");
                    e.printStackTrace();                
                }

                return true;
            }
        };
    }

    public void onFooterHyperLinkClick(ActionEvent actionEvent) throws IOException, URISyntaxException {
        Desktop.getDesktop().browse(new URI(Hyperlinks.CSITEC_WEBSITE));
    }

}

Here in LoginController I have Autowired LoginManager's object but it is getting assigned null every time therefore whenever I'm calling loginManager.loginManager(requestMap), I have no clue why it is happening because I'm sure my beans.xml file is loading and in that file I have written configuration for component scanning from base package and I have also written @Component in my LoginManager class file.

Here's the code for LoginManager as well :

@Component
public class LoginManager {

    @Autowired
    CommonDAO commonDAO;

    @Autowired
    JdbcTemplate jdbcTemplate1;

    public static String statusCode;
    public static String errorMessage;


    public void loginManager(Map<String, String> requestMap){
        try{

            String userName = requestMap.get(Constants.USERNAME);
            String passwordSHA = requestMap.get(Constants.PASSWORD);
            final byte[] authBytes = passwordSHA.getBytes(StandardCharsets.UTF_8);
            final String encodedPassword = Base64.getEncoder().encodeToString(authBytes);

            Object[] params = { userName, encodedPassword };
            String sqlQuery = ResourceFileReader.getSQLQuery(LookupSQLQueries.AUTHENTICATE_USER_QUERY);

            boolean result = commonDAO.validate(sqlQuery, params, jdbcTemplate1);

            if (!result) {
                errorMessage = Messages.INVALID_USERNAME_OR_PASSWORD;
                statusCode = "1";
                return;
            }

            statusCode = "0";

        }catch(Exception e){
            errorMessage = Messages.SOMETHING_WENT_WRONG;
            statusCode = "1";
        }
    }


}

Please help me out and guide me to make it work.

Answer 1

I'm not expert on JavaFX, but it seems your object is managed by JavaXF rather than Spring, hence no autowiring is happening.

You need to tell JavaXF how to deal with Spring. See JavaFX and Spring - beans doesn't Autowire :

 public class SpringFxmlLoader { private static final ApplicationContext applicationContext = new AnnotationConfigApplicationContext(SpringApplicationConfig.class); public Object load(String url, String resources) { FXMLLoader loader = new FXMLLoader(); loader.setControllerFactory(clazz -> applicationContext.getBean(clazz)); loader.setLocation(getClass().getResource(url)); loader.setResources(ResourceBundle.getBundle(resources)); try { return loader.load(); } catch (IOException e) { e.printStackTrace(); } return null; } } 

The important line being loader.setControllerFactory(clazz -> applicationContext.getBean(clazz));

Tutorials

• The link above mentions this tutorial .
• You may check this one too ;