Run spring boot without @SpringBootApplication annotation as jar library in another project

I'm trying to use @autowired annotation in a spring boot project that's not started by main method with @SpringBootApplication annotation. Instead, i did created a jar of that spring project and i'm using that jar as an external jar in a legacy project (non-spring project). As result i can't get ApplicationContext and all beans managed by spring when you run application from main method are null.

Is that possible to use Spring boot project as a .jar without run main method??

public class RetrieveSubscriberType {
    public RetrieveSubscriberType() {
        ApplicationContext appCtx = ApplicationContextUtils
                .getApplicationContext();
        
        this.subscriber = (SubscriberDAOImpl)appCtx.getBean("subscriber");
    }

appCtx always null

@Configuration
public class ApplicationContextUtils implements ApplicationContextAware {   
    private static ApplicationContext ctx;

      @Override
      public void setApplicationContext(ApplicationContext appContext)
          throws BeansException {
        ctx = appContext;

      }

      public static ApplicationContext getApplicationContext() {
        return ctx;
      }
}

ApplicationContextUtils where method setApplicationContext is not called

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