Hi guys, I'm trying to use JPA specification with ...

# announcements

[hyukchan]

Hi guys, I'm trying to use JPA specification with kotlin, but I'm having compilation errors... Has anyone have good example to show ?

[Lamberto Basti]

Have a look here!
https://github.com/lamba92/taass-backend/tree/master/src/main/kotlin/it/unito/projector
It's a bit old but it should work. It implements a REST repository backed by a db on AWS

[hyukchan]

Hi thanks for your quick response. Though I'm more looking for something like this:

[hyukchan]

public CustomerSpecifications {

public static Specification<Customer> customerHasBirthday() {
return new Specification<Customer> {
public Predicate toPredicate(Root<T> root, CriteriaQuery query, CriteriaBuilder cb) {
return cb.equal(root.get(Customer_.birthday), today);
}
};
}

public static Specification<Customer> isLongTermCustomer() {
return new Specification<Customer> {
public Predicate toPredicate(Root<T> root, CriteriaQuery query, CriteriaBuilder cb) {
return cb.lessThan(root.get(Customer_.createdAt), new LocalDate.minusYears(2));
}
};
}
}

[hyukchan]

Okay I finally found an example: https://github.com/gothinkster/kotlin-spring-realworld-example-app/blob/master/src/main/kotlin/io/realworld/repository/specification/ArticlesSpecifications.kt

[hyukchan]

Thanks for your help anyway