Unable to cast the resultant of the query into desired object in hibernate - sql

Question

I am not able to cast the query result to Desired Object UserTransactionInADay.
Here is my implementation
#Override
public UserTransactionInADay getTodaysActivity() {
Date date = new Date();
String modifiedDate= new SimpleDateFormat("yyyy-MM-dd").format(date);
Session session = getSession();
session.clear();
#SuppressWarnings("unchecked")
Query qry = session
.createQuery(
"Select u.infoDate, sum(u.totalActiveUsers) as totalActiveUsers, sum(u.plotsVisited) as plotsVisited, sum(u.totalDataSet) as totalDataSet, sum(u.totalAlerts) as totalAlerts, sum(u.totalCropStages) as
totalCropStages, sum(u.activitiesClosed) as activitiesClosed, sum(u.totalPlotInput) as totalPlotInput, sum(u.totalHarvest) as totalHarvest from UserTransactionInADay u where u.infoDate = ? group by u.infoDate");
qry.setString(0, modifiedDate);
List<UserTransactionInADay> userTransactionInADay = qry.list();
return userTransactionInADay.get(0);
}
Error I thrown like this
java.lang.ClassCastException: [Ljava.lang.Object; cannot be cast to com.raghu.model.UserTransactionInADay
com.raghu.dao.CropinDaoImpl.getTodaysActivity(CropinDaoImpl.java:92)
com.raghu.service.CropinServiceImpl.getTodaysActivity(CropinServiceImpl.java:68)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)

Answer 1

I think you need to review some of the Hibernate docs a bit. You are selecting a bunch of data and trying to cast it to an entity (I assume) collection.
What your query will return is an Object[][].
Assuming your UserTransactionInADay has the appropriate constructor, you'll want to do something like this:
"SELECT NEW UserTransactionInADay(u.infoDate, sum(u.totalActiveUsers)
AS totalActiveUsers, SUM(u.plotsVisited) AS plotsVisited,
SUM(u.totalDataSet) AS totalDataSet, SUM(u.totalAlerts) AS totalAlerts,
SUM(u.totalCropStages) AS totalCropStages, SUM(u.activitiesClosed) AS activitiesClosed,
SUM(u.totalPlotInput) AS totalPlotInput, SUM(u.totalHarvest) AS totalHarvest)
FROM UserTransactionInADay u WHERE u.infoDate = ? GROUP BY u.infoDate"
This will return UserTransactionInADay objects, again, assuming there is an appropriate constructor for that type.