Why this simple hql query doesn't work? uncategorized SQLException

Question

I have two tables: Research and userResearch, Research has userResearches list mapped to userResearch using @OneToMany. I'm trying to execute a simple hql query

from Research r inner join r.userResearches ur where ur.user=:user

and get this exception:

Hibernate operation: could not execute query; uncategorized SQLException for SQL [select...]; SQL state [24000]; error code [0]; Operation requires a scrollable ResultSet, but this ResultSet is FORWARD_ONLY.; nested exception is org.postgresql.util.PSQLException: Operation requires a scrollable ResultSet, but this ResultSet is FORWARD_ONLY.

What can be the reason? Entities are mapped right, everything works fine, I can retrive both entities using criteria API.

@Entity
public class UserResearch extends ManagedEntity {

    @ManyToOne
    @JoinColumn(name = "research_id")
    private Research research;

@Entity
public class Research extends ManagedEntity {

    @OneToMany(mappedBy = "research")
    private Set<UserResearch> userResearches = new HashSet<UserResearch>(0);

Answer 1

Well I don't know the particular reason, but I rewrite a query using getSession().createQuery() and it started working, before I was using our GenericDao it uses getHibernateTemplate.