@SpringBootApplication
public class Application {

public static void main(String[] args) {
    SpringApplication.run(ServiceNowMediatorApplication.class, args);
}
@Bean
public Alert b(){
    return new B();
}


@Bean
public ServiceB serviceB(B b){
    return new ServiceB(b);
}

}

@RestController
@RequestMapping("/{database}/alerts")
public class ControllerB {
  @Autowired private ServiceB serviceB;

  @Autowired
  private B b;

  @Autowired
  ControllerB(B b,ServiceB serviceB){
      this.b = b;
      this.serviceB = serviceB;
  }

  @RequestMapping(method = RequestMethod.POST)
  public B dosomethingCrazy(@RequestBody BImpl bimpl)  {


      String response = serviceB.dosomethingImportant();
      return bimpl;

  }

}

@Autowired
public B b;

@Autowired
public B getB() {
    return b;
}

@Autowired
public void setB(B b) {
    this.b = b;
}

@Autowired
public ServiceB(B b){
    this.b = b;

}

public String dosomethingimportant() {
  b.getValueOfFieldPassedInPOST(field1) ==> THIS RETURNS A NULL
 }

@RequestMapping(method = RequestMethod.POST)
  public B dosomethingCrazy(@RequestBody BImpl bimpl)  {

      **serviceB.setB(bimpl);**
      String response = serviceB.dosomethingImportant();
      return bimpl;

  }