java - Cast exception from one class to another -

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 session session2 = hibernateutil.getsessionfactory().opensession();         transaction tx2 = session2.begintransaction();        query q=session2.createquery("from studbean1 group sno");         list<student_change> l1=(list<student_change>)q.list();         //student_change sc=new student_change();           for(student_change sc3:l1){            session2.save(sc3);            tx2.commit();            session2.close();

here data coming studbean1 can access data student_change

but gives excption can't cast studbean1 student_change

given have modelled student_change generalisation of studbean1, list<studbean1> not subtype of list<student_change>. try getting list<studbean1>, iterating on , perform cast in loop.

why-is-liststring-not-a-subtype-of-listobject

anyway, there more problems in code should revise (see comments question).


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