Exception during processing: java.lang.ClassCastException

[sudheshna Iyer]

I have a stateless session bean which has a method that returns a collection. S0
I wrote a wrapper class that uses this stateless bean, converts
this collection to standard string[] and deployed to Weblogic appserver 8.1.

But after deploying, when I tried to access this webservice, I am getting:

xmlns:bea_fault="http://www.bea.com/servers/wls70/webservice/fault/1.0.0">java.lang.ClassCastException

This is the method in the wrapper class, which I am trying to access from webservice client:

public String[] getA(String custtomerNumber) {
String[] retAs = null;
try {
ArrayList als = (ArrayList)sfb.getAls(custNum); //sfb is the session bean home
retAs = new String[als.size()];
for(int i = 0; i < als.size(); i++){
retAs[i] = (String)als.get(i);
}
} catch (RemoteException e) {
e.printStackTrace();
}
return retAs;
}