Can't achieve dependency injection oustide a controller in Spring Booot

I am new at spring MVC framework and i am currently working in a web application that uses a session scoped bean to control some data flow.
I can access these beans in my application context using @Autowired annotation without any problem in the controllers. The problem comes when I use a class in service layer that does not have any request mapping (@RequestMapping, @GetMapping nor @PostMapping) annotation.
When I try to access the application context directly or using @Autowired or even the @Resource annotation the bean has a null value.

I have a configuration class as follow:

@Configuration
@EnableAspectJAutoProxy
@EnableJpaRepositories(repositoryFactoryBeanClass = EnversRevisionRepositoryFactoryBean.class, basePackages = "com.quantumx.nitididea.NITIDideaweb.repository")
public class AppConfig implements WebMvcConfigurer {
	
	@Bean (name = "lastTemplate")
	@SessionScope
	public LastTemplate getlastTemplate() {
		return new LastTemplate();
	}
//Some extra code

}

The POJO class is defined as :

public class LastTemplate {
	
	private Integer lastId;
	
	public LastTemplate(){
		
	}

	public Integer getLastId() {
		return lastId;
	}

	public void setLastId(Integer lastId) {
		this.lastId = lastId;
	}

}

The I have a Test class that is annotated as service and does not have any request mapping annotated method:

//@Controller
@Service
public class Test {
	
//	 @Autowired
//	 private ApplicationContext context;	
	
//	@Autowired
	@Resource(name = "lastTemplate")
	public LastTemplate lastTemplate;
	
//	@Autowired
//	public void setLastTemplate(LastTemplate lastTemplate) {
//		this.lastTemplate = lastTemplate;
//	}

	public Test() {
	}
	
//	@RequestMapping("/test")
	public String testing() {
//		TemplateForma last = (TemplateForma) context.getBean("lastInsertedTemplate");
//		System.out.println(last);
		System.out.println(lastTemplate);
//		System.out.println(context.containsBean("lastTemplate"));
//		System.out.println(context.getBean("lastTemplate"));
		System.out.println("Testing complete");
		return "Exit from testing method";
//		return "/Messages/Success";
	}
}

As you can see, there is a lot of commented code to show all the ways i have been trying to access my application context, using an Application context dependency, autowiring, declaring a resource and trying with a request mapping. The bean is null if no controller annotation and request mapping method is used and throws a java null pointer exception when I use the context getBean() methods.

Finally I just test my class in a controller that i have in my app:

@RequestMapping("/all")
	public String showAll(Model model) {
		
		Test test = new Test();
		test.testing();

		return "/Administrator/test";
	}

Worth to mention that I also tried to change the scope of the bean to a Application scope and singleton, but it not worked. How can access my application context in a service class without mapping a request via controller?

> Worth to mention that I also tried to change the scope of the bean to a Application scope and singleton, but it not worked

It should have worked in this case.

> How can access my application context in a service class without mapping a request via controller?

Try one of these :-

@Autowired
private ApplicationContext appContext;

OR

Implement ApplicationContextAware interface in the class where you want to access it.

Edit:

If you still want to access ApplicationContext from non spring managed class. Here is the link to article which shows how it can be achieved.

This page gives an example to get spring application context object with in non spring managed classes as well

What worked for me is that session scoped bean had to be removed in the application configuration declaration and moved to the POJO definition as follows:

@Component
@SessionScope    
public class LastTemplate {
    
    private Integer lastId;
    
    public LastTemplate(){
        
    }

    public Integer getLastId() {
        return lastId;
    }

    public void setLastId(Integer lastId) {
        this.lastId = lastId;
    } 
}

The I just call the bean using @Autowired annotation.