this is a code for making an XML sheet by using a loop . the vector passed for the loop comes from a different location with a static number of values(5 values all the time). after finishing the work all the elements were removed from the vector .. Kindly debug this code

XML

public synchronized String xmlWrite(String rootEle){
        sb.delete(0,sb.length());
        StringBuffer append = sb.append("<?xml version=\"1.0\" encoding=\"UTF-8\"?>").append("<").append(rootEle).append(">");
        String s="";
        for(int i=0;i<v.size();i++){
            s=s.concat("<vectorData>"+(String)v.elementAt(i)+"</vectorData>");
        }
        append.append(s);
        append.append("</").append(rootEle).append(">");
        String s2=append.toString();

        return s2;
        
    }