When your view has column with option 'Show multiple values as separate entries' and you use ViewEntry to read data from that column you will have a problem. Result of your getColumnValues() can be different, f.x. in 1 case it can be 'Vector' and in another case 'String'. It depends if entry was really split on few entries because of multi-value. I've lookup around and found this issue already reported on IBM ~3 years ago (IBM whats up?)
Full description of problem
Here is a solution I made
Vector v = entry.getColumnValues();
Object o = v.get(0);
String title = "";
if (o.getClass().equals(String.class)) {
title = (String) o;
}
else if (o.getClass().equals(Vector.class)) {
Vector tmp = (Vector)o;
title = (String) tmp.get(0);
}