Nullpointer for Repo using springboot, hibernate and java FX

[Daniel Demesmaecker]

I'm building a spring boot app and need to keep a timestamp containing when the program last runned. So I created a table for it. In the stopmethod of my main I try to save the timestamp to the db, but keep getting a nullpointerexeption, I think caused by the autowirerin failling. Anny tips?

My main:

@SpringBootApplication
@EnableJpaRepositories(basePackages = "be.kokw.repositories")
public class Main extends Application {
    public static Stage stage;
    public static ConfigurableApplicationContext springContext;
    private Parent root;
    @Autowired
    @Qualifier("timeStampRepo")
    private TimeStampRepo repo;

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

    }

    @Override
    public void init() throws Exception {
        springContext = SpringApplication.run(Main.class);
        FXMLLoader loader = new FXMLLoader(getClass().getResource("/fxml/home.fxml"));
        loader.setControllerFactory(springContext::getBean);
        root = loader.load();
    }

    @Override
    public void start(Stage primaryStage){
        stage = primaryStage;
        stage.setTitle("KOKW-AdminApp");
        Image icon = new Image(getClass().getResourceAsStream("/images/logoKOKW.jpg"));
        stage.getIcons().add(icon);
        stage.setScene(new Scene(root, 1200, 600));
        stage.show();
    }

    @Override
    public void stop(){
        TimeStamp stamp = new TimeStamp(LocalDate.now());
        repo.save(stamp);
        springContext.close();
    }
}

The Stacktrace:

Exception in Application stop method
java.lang.reflect.InvocationTargetException
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at com.sun.javafx.application.LauncherImpl.launchApplicationWithArgs(LauncherImpl.java:389)
	at com.sun.javafx.application.LauncherImpl.launchApplication(LauncherImpl.java:328)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at sun.launcher.LauncherHelper$FXHelper.main(LauncherHelper.java:767)
Caused by: java.lang.RuntimeException: Exception in Application stop method
	at com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:922)
	at com.sun.javafx.application.LauncherImpl.lambda$launchApplication$155(LauncherImpl.java:182)
	at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.NullPointerException
	at be.kokw.Main.stop(Main.java:57)
	at com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$163(LauncherImpl.java:882)
	at com.sun.javafx.application.PlatformImpl.lambda$runAndWait$175(PlatformImpl.java:326)
	at com.sun.javafx.application.PlatformImpl.lambda$null$173(PlatformImpl.java:295)
	at java.security.AccessController.doPrivileged(Native Method)
	at com.sun.javafx.application.PlatformImpl.lambda$runLater$174(PlatformImpl.java:294)
	at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)
	at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
	at com.sun.glass.ui.win.WinApplication.lambda$null$148(WinApplication.java:191)
	... 1 more
Exception running application be.kokw.Main

[Dave Tolls]

SpringApplication.run is supposed to be called in the main() method.
This allows Spring to then create everything it needs, including the autowiring.
At the moment your code is creating the Main instance itself, and then calling SpringApplication.run, so as you thought, the wiring is not being done for the already-existing Main instance.

I'm not too sure how you are supposed to launch them both exactly.
Might need some digging around for that.

[Daniel Demesmaecker]

Not so a pretty solution, but would it help if I maded it a static varriable in a different class?

[Daniel Demesmaecker]

Daniel Demesmaecker wrote:Not so a pretty solution, but would it help if I maded it a static varriable in a different class?

and the maded a instance of that class?

[Knute Snortum]

This looks like it has some useful tips.

[Daniel Demesmaecker]

It dosn't, the problem is not fx related or how to combine everything. Everything is working great. The problem is how to autowire my repo from the mainClass.
If I try the same code in a different class, it works
I remember a spring mvc project I worked on a while a go and there I could do it this way:

TimeStampRepo repo = springContext.getBean("timeStampRepo", TimeStampRepo.class);

but that dosn't work in this case.

[Dave Tolls]

Daniel Demesmaecker wrote:It dosn't, the problem is not fx related or how to combine everything. Everything is working great. The problem is how to autowire my repo from the mainClass.

But that is the problem.

You are trying to autowire the Main class while you are inside the instance of the Main class you want to autowire.

    public void init() throws Exception {
        springContext = SpringApplication.run(Main.class);
        FXMLLoader loader = new FXMLLoader(getClass().getResource("/fxml/home.fxml"));
        loader.setControllerFactory(springContext::getBean);
        root = loader.load();
    }

That call to SpringApplication.run cannot Autowire the TimeStampRepo instance that is inside the class that this method is a part of.
Indeed, that call will result in Spring creating another Main instance with the Autowired value, but that instance will not have kicked off as a JavaFX app.