Nested Dynamic variable names (Checkboxes & List boxes)

Hi Experts,
I have a JSP page that populates Checkboxes dynamically from the database the for each checkbox there is a listbox (multiple selection is available).
The error I am receiving is this:

Incompatible type for method. Can't convert java.lang.String[] to java.lang.String.
String subsrvs_id[] = Utils.removeNull(uf.getParameterStrings(subsrvs_S));

While I am trying to read the arrays like this:
// uf is an upload file class and getParameterStrings is used to read getParameterValues
// I have another getParameterValues that returns an ArrayList instead of an array[]

  for (int i = 0; i < x_service_type.size(); i++) {
    String business_values = x_service_type.get(i).toString();
    String subsrvs_S = "subcategory"+business_values; // Create the dynamic name
    String subsrvs_id[] = Utils.removeNull(uf.getParameterStrings(subsrvs_S));
      for (int j = 0;subsrvs_id!=null && j < subsrvs_id.length && subsrvs_id[j]!=null; j++) {
        db.insert("insert into bid_service_type"+tableVersion+"(bid_id,service_type_id,subservice_type_id)values("+id+","+ business_values+","+subsrvs_id[j]+")");
      }
  }

This is so urgent; I would really appreciate any help or ideas

If you need further explanation please let me know.

Here is my code that has the check boxes and list boxes:

  String sqlStrSub = "";
  String sqlStrSubCnt ="";
  int myCnt = 0;
  String incSvs = "";
  boolean isChecked = false;
  String isSelected = "";

/*    CREATE CHECK BOXES      */

   if (db.inquire("select id,service_type_name from service_type"+tableVersion+" where visible='Y' order by service_type_name")) {
      ResultSet rs = db.getResultSet();
      while (rs.next()) {
                               sts=sts+"<input name=x_service_type type=checkbox value="+rs.getString("id");
          if (stids.indexOf(","+rs.getString("id")+",")>=0) {
          sts=sts+" checked";
          isChecked = true;
          }
           sts=sts+"> "+rs.getString("service_type_name")+"<br>";

/*    CREATE LIST BOXES      */


  sqlStrSub = "select id,service_type_id,subservice_type_name, selected ";
  sqlStrSub= sqlStrSub + "from subservice_type"+tableVersion+" where service_type_id="+rs.getString("id");

  sqlStrSubCnt = "select count(*) as myCnt ";
  sqlStrSubCnt= sqlStrSubCnt + "from subservice_type"+tableVersion+" where ";
  sqlStrSubCnt= sqlStrSubCnt + "service_type_id="+rs.getString("id");
  //out.println("<br>sqlStrSubCnt: " + sqlStrSubCnt);
  if(db.inquire(sqlStrSubCnt)) {
    ResultSet rsSubCnt = db.getResultSet();
    if (rsSubCnt.next()){
    myCnt = rsSubCnt.getInt("myCnt");
    }
    rsSubCnt.close();
    rsSubCnt = null;
  }
  incSvs = "subcategory"+rs.getString("id");
  out.println("<hr>incSvs : " + incSvs);
   if (myCnt>0 && isChecked) {
   db.inquire(sqlStrSub);
      ResultSet rsSub = db.getResultSet();
      //rsSub = db.getResultSet();
      sts=sts+" <select multiple name="+incSvs+">";
      sts=sts+"<option value=\"0\">Select One</option>";
      while (rsSub.next()) {
      isSelected = rsSub.getString("selected");
                               sts=sts+"<option value="+rsSub.getString("id");
  if ((substids.indexOf(","+rsSub.getString("id")+",")>=0) && (isSelected.equals("Y"))) {
            sts=sts+" selected";
          }
           sts=sts+"> "+rsSub.getString("subservice_type_name")+"";
           sts=sts+"</option>";
      }
          sts=sts+"</select><br>";
          //out.println("substids = "+rsSub.getString("selected").equals("Y"));
      rsSub.close();
      rsSub=null;
  }

}
      rs.close();
      rs=null;
  }

Thank you in advance