How to fetch data from two tables(one-to-many relations) using Hibernate Createcriteria - hibernate-mapping

Question

How to fetch data from two tables based upon User id ?
*****************Role Class***********************
#Entity
#Table(name = "IUC_CON_USER_ROLE_MAP")
public class Role {
#Id
#Column(name="F_ROLE_MAP_ID")
int rolemap;
#Column(name="F_ROLE_ID")
int roleid;
#OneToMany(mappedBy="role",fetch=FetchType.EAGER)
Set<User> F_USER_ID;
*********************User class*******************
#Entity
#Table(name = "IUC_CON_USER")
public class User implements Serializable {
#Id
#Column(name = "F_USER_ID")
private int id;
#Column(name = "F_USER_NAME")
private String name;
#Column(name = "F_USER_PWD")
private String pwd;
#ManyToOne
#JoinColumn(name="F_USER_ID",insertable=false,updatable=false)
private Role role;
----------setter and getter for properties
}
External edit:
Criteria creation code:
DetachedCriteria uCrit = DetachedCriteria.forClass(User.class, "user");
uCrit.add(Restrictions.eq("user.id", 5));
uCrit.setProjection(Projections.property("user.id"));
DetachedCriteria criteria = DetachedCriteria.forClass(Role.class, "role");
criteria.add(Property.forName("role.F_USER_ID").in(uCrit));
List lt1 = criteria.getExecutableCriteria(getSession()).list();

Answer 1

use createAlias
criteria.createAlias("propertiy_of_main_entity", "aliastName");
For me this fetches entities asociated with root entity via some entity property name;
in your case something like
createAlias("F_USER_ID", "roleUsers");
should do.
Anyway why ins't your field name following commong naming doctrine for Java? WHY_IS_IT_UPPERCASED_WITH_DASHES_LIKE_CONSTANTS_?
All in all everything is explained in Hibernate documentation. If alias won't work, than fetch associations like in examples from Hibernate documentation under link I provided.

Answer 2

You can use below series of statements to fetch User along with the Role:
int userId = 1;
Criteria criteria = session.createCriteria(User.class);
criteria.setFetchMode("role", FetchMode.JOIN);
criteria.add(Restrictions.eq("id", userId));
User user = (User) criteria.uniqueResult();
The default fetching strategy of Hibernate is to fetch the associations lazily, which you need to override at runtime in code, if you want the associations (here the Role) to be fetched along with User. The third statement is doing this overriding by seting the fetch mode to JOIN. This statement FetchMode.JOIN overrides the default behavior, so that Role will be fetched along with the User.