Hi,
There is a bug with Hibernate 5.4.5 and higher. New spring boot 2.2.0 and hibernate 5.4.6 paging is not working properly for repositories. For this part of code in spring boot:
protected <S extends T> TypedQuery<Long> getCountQuery(@Nullable Specification<S> spec, Class<S> domainClass) {
CriteriaBuilder builder = this.em.getCriteriaBuilder();
CriteriaQuery<Long> query = builder.createQuery(Long.class);
Root<S> root = this.applySpecificationToCriteria(spec, domainClass, query);
if (query.isDistinct())

else

query.orderBy(Collections.emptyList());
return this.em.createQuery(query);
}

the count query is not taking into account inherited entities and the query look like below:

select count(keycloakfe0_.id) as col_0_0_
from keycloak_fed_mapper_ldap keycloakfe0_
inner join keycloak_federation keycloakfe1_ on keycloakfe0_1_.id_federation=keycloakfe1_.id
where keycloakfe1_.environment=?

I've verified all version since 5.4.0 to 5.4.8 and since changes in 5.4.5 query was ok. Below there is a query for version 5.4.4:

select count(keycloakfe0_.id) as col_0_0_
from keycloak_fed_mapper_ldap keycloakfe0_
inner join keycloak_fed_mapper keycloakfe0_1_ on keycloakfe0_.id=keycloakfe0_1_.id
inner join keycloak_federation keycloakfe1_ on keycloakfe0_1_.id_federation=keycloakfe1_.id
where keycloakfe1_.environment=?

The issue it that this bug ha a big impact on spring repositories abstraction with paging mechanism.
I assue it may be related with this feature in 5.4.5 release

https://hibernate.atlassian.net/browse/HHH-12993

If more details required please let me know.