Class Cast Exception error in j2ee

Question

I am trying to retrieve record from a particular column in my data base, after writing the finder method in the entitybean, I am getting error from session bean Class Cast Exception: java.lang.String cannot be cast to packagename.PaymentsLocal. Below is the code snippet in my session bean class

ArrayList a = new ArrayList();
Collection col = null;
 try{
    col = plh.findByAllSessions();
    Iterator i = col.iterator();
    while(i.hasNext()){
       pl = (PaymentsLocal)i.next(); 
       a.add(new paymenthelper( pl.getSession()));
    }
  } catch (Exception e) {
     System.out.println("viewing all sessions"+e.getMessage());
  }
 return a;
}

You are trying to cast a String to an PaymentsLocal which isn't possible. Or do you have a real question? — User404, May 10 '15 at 12:04
https://docs.oracle.com/javase/7/docs/api/java/lang/ClassCastException.html — gerrytan, May 10 '15 at 12:05
Btw, please avoid using [raw types](http://stackoverflow.com/questions/2770321/what-is-a-raw-type-and-why-shouldnt-we-use-it). They are bad. — Tom, May 10 '15 at 12:21

score 0 · Accepted Answer · answered May 10 '15 at 12:11

These lines set up an Iterator<String> implicitly, since whatever collection you're returning in plh.findByAllSessions() is a Collection of Strings.

col = plh.findByAllSessions();
Iterator i = col.iterator();

Thus this line tried to force a String to a PaymentsLocal object, which is not possible, causing a ClassCastException.

pl = (PaymentsLocal)i.next();

This is because i.next() returns an object of the type of the collection.

Class Cast Exception error in j2ee

1 Answers1