splatter_fadli splatter_fadli - 5 months ago 33
Java Question

[Ljava.lang.Object; cannot be cast to

I want to get value from the database, in my case I use

List
to get the value from the database but I got this error

Exception in thread "main" java.lang.ClassCastException: [Ljava.lang.Object; cannot be cast to id.co.bni.switcherservice.model.SwitcherServiceSource
at id.co.bni.switcherservice.controller.SwitcherServiceController.LoadData(SwitcherServiceController.java:48)
at id.co.bni.switcherservice.controller.SwitcherServiceController.main(SwitcherServiceController.java:62)


this is my code

Query LoadSource = session_source.createQuery("select CLIENT,SERVICE,SERVICE_TYPE,PROVIDER_CODE,COUNT(*) FROM SwitcherServiceSource" +
" where TIMESTAMP between :awal and :akhir" +
" and PROVIDER_CODE is not null group by CLIENT,SERVICE,SERVICE_TYPE,PROVIDER_CODE order by CLIENT,SERVICE,SERVICE_TYPE,PROVIDER_CODE");
LoadSource.setParameter("awal", fromDate);
LoadSource.setParameter("akhir", toDate);

List<SwitcherServiceSource> result_source = (List<SwitcherServiceSource>) LoadSource.list();
for(SwitcherServiceSource tes : result_source){
System.out.println(tes.getSERVICE());
}


any help will be pleasure :)

@raffian, did you mean like this??

List<Switcher> result = (List<Switcher>) LoadSource.list();
for(Switcher tes : result){
System.out.println(tes.getSERVICE());
}

Answer
java.lang.ClassCastException: [Ljava.lang.Object; cannot be cast to id.co.bni.switcherservice.model.SwitcherServiceSource

Problem is

(List<SwitcherServiceSource>) LoadSource.list();

This will return a List of Object arrays (Object[]) with scalar values for each column in the SwitcherServiceSource table. Hibernate will use ResultSetMetadata to deduce the actual order and types of the returned scalar values.

Solution

List<Object> result = (List<Object>) LoadSource.list(); 
Iterator itr = result.iterator();
while(itr.hasNext()){
   Object[] obj = (Object[]) itr.next();
   //now you have one array of Object for each row
   String client = String.valueOf(obj[0]); // don't know the type of column CLIENT assuming String 
   Integer service = Integer.parseInt(String.valueOf(obj[1])); //SERVICE assumed as int
   //same way for all obj[2], obj[3], obj[4]
}

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