java - Spring Data JPA save child without fetch the parent -

how save child entity spring data jpa repositories if know parent id?

for example if have 1 many relation:

@entity public class customer {     @id @generatedvalue(strategy=generationtype.auto)     private long id;     private string firstname;     private string lastname;     @manytoone     private customercategory category; }  @entity public class customercategory {     @id @generatedvalue(strategy=generationtype.auto)     private long id;     private string name; } 

one can like:

customercategory somecategory = customerrepository.findone(1l);// how skip line. id should enough.  customer cust = new customer("evgeni", "dimitrov", somecategory);            customerrepository.save(cust); 

jpa can load(just create proxy , set id) instead of 'get'(select db). possible spring data jpa?