I'm executing this query:

Query query = sess.createQuery( "
from Car as Car
where Car.id=?");
query.setParam(0,carPK);

where id is Hibernate pk identifier, and value of ? is Object that represents composite primary key.

The following exception occures:


org.hibernate.QueryException: Expected positional parameter count: 1, actual parameters: [dataaccess.crud.hibernate.CarPk@5b35] [from Car as Car
where Car.id=?
]
at org.hibernate.impl.AbstractQueryImpl.verifyParameters(AbstractQueryImpl.java:319)
at org.hibernate.impl.AbstractQueryImpl.verifyParameters(AbstractQueryImpl.java:275)
at org.hibernate.impl.QueryImpl.list(QueryImpl.java:75)
at org.hibernate.impl.AbstractQueryImpl.uniqueResult(AbstractQueryImpl.java:811)
at
(...)

if I change the query to


Query query = sess.createQuery( "
from Car as Car
where Car.id=:param1");
query.setParam("param1",carPK);

and use the same object as value of param1, everything is ok