Adding Spring Dependency Injection in JavaFX (JPA Repo, Service)

Question

I have a java FX basic application which has a simple Scene(a form). I have a Mysql Db and I am using Spring JPA (spring data jpa i.e repository/entities) to interact with the same.

Now, since we know that javaFx has some lifecycle hooks namely: init() start() and stop().

Let's say I want to insert data in Database using JPA save() method. Usually, if it was my controller, a normal DB injection like:

@Autowired
EmployeeRepo employeeRepo;

Would have worked. But, I am not able to access this (or any Autowired Injection) inside the lifecycle methods.

public void start(Stage primaryStage) throws Exception {

// Some Code

employeeRepo.findAll() <- This is returning null

However, when I add a test method and use the same, It works fine:

@PostConstruct
public void test() {
// Repo object is not giving null
}

Is there a way I can manually inject the dependencies inside my button listener or pass it to the launch method.

Please let me know if there is a solution as I am new to JavaFX