Java String to Object getting unwanted '\' -

i'm building mongodb java query, , while trying find specific value in db, query query gets messed up, because of unwanted '\' chars in string. here i'm doing.

i list of strings mongodb, , perform find in collection, using strings.

dbcursor = null; for(string s : list){  basicdboject query = = new basicdbobject("actor.preferredusername",  s);  cursor = coll.find(query);  //treat results  } 

if system.out.println() using query, get:

 { "actor.preferredusername" : "\"napolesunset75\""} 

notice '\' in last field.

now, test purposes, if change 's' fixed string "xpto", query created in sucessfully, returning

 { "actor.preferredusername" : "xpto"} 

can help?

i think, due quote inside string going store in database. if that's can use class , it's static public method validate string before storing in database :

public class sqlvalidator {  private static final string single_quote    = "\u0027";      /**      * replaces ' ''. should used in read/write queries.      *       * @param str      */     public static string quoteinquery(string str) {     if (str == null)         return null;     return str.replaceall(single_quote, single_quote + single_quote);     } }