Criteria Builder In query for list of string - spring

Question

I am passing following json from front end :
{names: 'ABC MKL-56-2,ABC MKL-56-3'};
In service layer,I am trying to run in query with the help of criteria builder as follows :
public List<APDetails> getWP(String names) {
CriteriaBuilder builder = em.getCriteriaBuilder();
CriteriaQuery<APDetails> query = builder.createQuery(APDetails.class);
Root<APDetails> root = query.from(APDetails.class);
Predicate hasA = builder.in(root.get(APDetails_.names).in(Arrays.asList(names.split(","))));
query.where(builder.and(hasA));
List<APDetails> APs = em.createQuery(query.select(root)).getResultList();
return APs;
}
I am getting following error :
Error message: org.hibernate.hql.internal.ast.QuerySyntaxException:
unexpected token: in near line 1, column 163 [select generatedAlias0
from com.app.ow.APDetails as generatedAlias0 where generatedAlias0.names in (:param0, :param1) in ()]

Answer 1

First of all, if you're using springboot, I suggest you extend the JpaSpecificationExecutor class (check here, here, and here for more information) from your APDetailsRepository (I believe you're using them somewhere...):
public interface APDetailsRepository extends JpaRepository<APDetails, Long>, JpaSpecificationExecutor<APDetails> {
Then, try this:
#Autowired
public APDetailsRepository apDetailsRepository;
........
public List<APDetails> getWP(String names) {
List<String> namesAsList = Arrays.asList(names.split(","));
List<APDetails> listAPDetails = this.apDetailsRepository.findAll(createSpecification(namesAsList));
return listAPDetails;
}
public Specification<APDetails> createSpecification(List<String> names) {
return new Specification<APDetails>() {
private static final long serialVersionUID = 1L;
#Override
public Predicate toPredicate(Root<APDetails> root, CriteriaQuery<?> query, CriteriaBuilder builder) {
List<Predicate> predicates = new ArrayList<Predicate>();
if (names!= null && !names.isEmpty()) {
List<Predicate> predicatesNames = new ArrayList<Predicate>();
for (String name : names) {
predicatesNames.add(builder.equal(root.<String>get("names"), name));
//I believe that the "APDetails_.names" attribute is a String...
}
predicates.add(builder.or(predicatesNames.toArray(new Predicate[] {})));
}
return builder.and(predicates.toArray(new Predicate[] {}));
}
};
}