gstackoverflow gstackoverflow - 2 months ago 5
Java Question

Can not set java.lang.Integer field to java.lang.Integer

User declaration:

@Entity
public class User {
@Id
@GeneratedValue
private Integer id;
....


Pattern declaration:

@Entity
public class Pattern {
@Id
@GeneratedValue
Integer id;
...


UserPatternDeclaration:

public class UserPattern {
@Id
@GeneratedValue
Integer id;

@ManyToOne
@JoinColumn(name = "user_id")
User user;

@ManyToOne
@JoinColumn(name = "pattern_id")
Pattern pattern;
...


request to database:

Session session = sessionFactory.getCurrentSession();
Query query = session.createQuery("from UserPattern where user = :user_id and pattern = :pattern_id ");
query.setParameter("user_id", userId);
query.setParameter("pattern_id", pattern_id);
List<UserPattern> list = query.list();//exception throws here


I got following exception:

...
java.lang.IllegalArgumentException: Can not set java.lang.Integer field
com.....s.model.User.id to java.lang.Integer
at sun.reflect.UnsafeFieldAccessorImpl.throwSetIllegalArgumentException(UnsafeFieldAccessorImpl.java:164)
at sun.reflect.UnsafeFieldAccessorImpl.throwSetIllegalArgumentException(UnsafeFieldAccessorImpl.java:168)
at sun.reflect.UnsafeFieldAccessorImpl.ensureObj(UnsafeFieldAccessorImpl.java:55)
at sun.reflect.UnsafeObjectFieldAccessorImpl.get(UnsafeObjectFieldAccessorImpl.java:36)
at java.lang.reflect.Field.get(Field.java:379)
....


Please help to fix this issue.

error message looks very very strange.

I have read related topic click but I don't found out answer.

P.S.



hibernate log(before exception):

Hibernate:
select
userpatter0_.id as id1_2_,
userpatter0_.amountSearched as amountSe2_2_,
userpatter0_.amountplayed as amountpl3_2_,
userpatter0_.pattern_id as pattern_4_2_,
userpatter0_.user_id as user_id5_2_
from
UserPattern userpatter0_
where
userpatter0_.user_id=?
and userpatter0_.pattern_id=?


In browser I see following message:

HTTP Status 500....could not get a field value by reflection getter of...model.User.id

Answer

What happens if you change your HQL query to from UserPattern where user.id = :user_id and pattern.id = :pattern_id?

I think Hibernate is confusing objects and ID fields.

Comments