Query not executing, throwing exception - jpa

Question

I'm currently working with a JPA project from my university. I'm having problems with a Query, especifically a Method on a #Service class that receives numerous parameters.
First of all, I'm trying just to make the query work with a two parameters.
Here is the method.
#Override
#Transactional ( readOnly = true )
public List<Candidate> obtainCandidatesOps(String name, String firstName,
String secondName, String passport, CandidateType candidateType,
Area area, Country country) {
List<Candidate> resultList = new ArrayList<Candidate>();
CriteriaBuilder cb = em.getCriteriaBuilder();
CriteriaQuery<Candidate> cq = cb.createQuery(Candidate.class);
Root<Candidate> r = cq.from(Candidate.class);
cq.where(cb.and(cb.equal(r.get("name"), cb.parameter(String.class, "name")),cb.equal(r.get("firstLastName"), cb.parameter(String.class, "firstName"))));
cq.select(r);
resultList = em.createQuery(cq).getResultList();
return resultList;
}
While I try to execute this Query I receive this error:
WARNING: #{searchBean.fillCandidatesOps}: java.lang.IllegalArgumentException: org.hibernate.QueryException: Not all named parameters have been set: [firstName, name] [select generatedAlias0 from Candidate as generatedAlias0 where ( generatedAlias0.name=:name) and ( generatedAlias0.firstLastName=:firstName)]
Where is the mistake/problem?
I've read this topics, and found no solution to my problem.
Caused by: org.hibernate.QueryException: Not all named parameters have been set: [isActive] [from User where isActive = :isActive]
How to solve "org.hibernate.QueryException: Not all named parameters have been set" error?

Answer 1

As the 2 linked threads tell you clear enough (so no idea why you have "looked at them for 5 days" and not noticed this), you need to set the VALUE of the parameters that you have defined in that query.
cq.where(cb.and(cb.equal(r.get("name"), cb.parameter(String.class, "name")),cb.equal(r.get("firstLastName"), cb.parameter(String.class, "firstName"))));
cq.select(r);
Query query = em.createQuery(cq);
query.setParameter("name", name);
query.setParameter("firstName", firstName);
resultList = query.getResultList();