Customize update entity on Spring Data repository - spring

Question

I have XRepository interface (extends JpaRepository). On create or update X entity i need to call method of another repository (YRepository) in transaction (exactly: update some field and use new value in created/updated entity X).
To do that i created a service class with #Transactional methods and custom REST Controller. POST mapping on controller works OK and is acceptable for me, but have problem how to implement in more elegant way update (PUT/PATCH) existing entity in my service layer. It works too, but had to use BeanUtils.copyProperties(). Is a better, more conventional way to do that ?
public interface XRepository extends JpaRepository<X, Long> {
}
public interface YRepository extends JpaRepository<Y, Long> {
}
#BasePathAwareController
public class XRestControllerCustom {
#Autowired
private MyService myService;
#PostMapping("/x")
public #ResponseBody ResponseEntity<X> create(#RequestBody Resource<X> x) {
return new ResponseEntity<X>(myService.save(x.getContent()), HttpStatus.CREATED);
}
#PatchMapping("/x/{id}")
public #ResponseBody ResponseEntity<X> update(#PathVariable Long id, #RequestBody Resource<X> x) {
myService.update(id, x.getContent());
return new ResponseEntity<>(HttpStatus.NO_CONTENT);
}
}
#Component
public class MyService {
#Autowired
private XRepository xRepository;
#Autowired
private YRepository yRepository;
#Transactional
public X save(X x) {
yRepository.update();
x.setField(yRepository.get());
return xRepository.save(x);
}
#Transactional
public X update(Long id, X partial) {
X x = xRepository.getOne(id);
BeanUtils.copyProperties(x, partial);
x.setId(id); // because copyProperties makes id null
yRepository.update();
x.setField(yRepository.get());
return xRepository.save(x);
}
}