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);
}