java.lang.ClassCastException: org.hibernate.impl.CriteriaImpl cannot be cast

Question

I am new to Hibernate Criteria , I found many examples using list. Likes to know how a criteria object can be converted to Employee object. Is it possible for Hibernate Criteria to return a class entity.

Employee emp=  (Employee) session.createCriteria(Employee.class,"a")
.createAlias("a.jobs", "j") 
.add(Restrictions.eq("id", id))
.add(Restrictions.eq("j.active", "1"));

java.lang.ClassCastException: org.hibernate.impl.CriteriaImpl cannot be cast to Employee.

jobs object is one to many relationship, trying to filteractive objects of jobs

v.ladynev · Accepted Answer · 2016-03-24 16:54:13Z

1

You need to use list() method

List<Employee> result =  (List<Employee>) session.createCriteria(Employee.class,"a")
.createAlias("a.jobs", "j") 
.add(Restrictions.eq("id", id))
.add(Restrictions.eq("j.active", "1")).list();

or uniqueResult(), but you will have an exception, if there is more than one record. If there is not any result uniqueResult() will return null.

Employee result = (Employee) session.createCriteria(Employee.class,"a")
.createAlias("a.jobs", "j") 
.add(Restrictions.eq("id", id))
.add(Restrictions.eq("j.active", "1")).uniqueResult();

edited Mar 24, 2016 at 16:54

answered Mar 24, 2016 at 14:21

v.ladynev

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2 Comments

Cork Kochi Over a year ago

As I am filtering by ID , it will be a single object.

v.ladynev Over a year ago

@CorkKochi I update my answer. You can use only those two methods.

Prabhjyot Saini · Accepted Answer · 2017-05-25 12:29:35Z

0

If there is multiple records but you want single unique result to casting into the model class without using list then you can also use following things :

Employee emp=  (Employee) session.createCriteria(Employee.class,"a")
.createAlias("a.jobs", "j") 
.add(Restrictions.eq("id", id))
.add(Restrictions.eq("j.active", "1")).setMaxResults(1).uniqueResult();

answered May 25, 2017 at 12:29

Prabhjyot Saini

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