Class Struktur

hello, i want to add a calss to a hass

The Dataclass is this

/*
  * To change this template, choose Tools | Templates
  * and open the template in the editor.
  */
package my.config;

/**
  *
  * @author smiefert
  */
public class JConfigEntry {

     Integer CID;
     String ckey, cvalue, cdescription;

     // Alles l?schen
     public void clear() {
         this.setCID(0);
         this.setCkey("");
         this.setCvalue("");
         this.setCdescription("");
     }

     // Setter
     public void setCID(Integer CID) {
         this.CID = CID;
     }

     public void setCkey(String ckey) {
         this.ckey = ckey;
     }

     public void setCvalue(String cvalue) {
         this.cvalue = cvalue;
     }

     public void setCdescription(String cdescription) {
         this.cdescription = cdescription;
     }

     // Getter
     public Integer getCID() {
         return this.CID;
     }

     public String getCkey() {
         return this.ckey;
     }

     public String getCvalue() {
         return this.cvalue;
     }

     public String getCdescription() {
         return this.cdescription;
     }
}

and i call it here

public class JConfig {
     // public Collection c = new LinkedList();
     // public Collection c = new ArrayList();
     // public Collection c = new LinkedList();
     // public Collection c = new HashSet();
     // public HashMap c = new HashMap ();
     // public HashMap c = new LinkedHashMap ();
     // public ArrayList data = new ArrayList();

     // public static ArrayList<HashMap<String, String>> data = new
ArrayList<HashMap<String, String>>();
     public static HashMap<String, HashMap> data = new
LinkedHashMap<String, HashMap>();

     public void JConfig() {
         String strSQL = "";
         JDb db = new JDb();
         db.ConnectDb();
         strSQL = "SELECT " +
                 " CID, " +
                 " ckey," +
                 " cvalue," +
                 " cdescription " +
                 "FROM " +
                 " config " +
                 "ORDER BY " +
                 " ckey";
         db.makeQuery(strSQL);
         try {
             while (db.rs.next()) {
                 JConfigEntry c = new JConfigEntry();
                 c.setCID(db.rs.getInt("CID"));
                 c.setCkey(db.rs.getString("ckey"));
                 c.setCvalue(db.rs.getString("cvalue"));
                 c.setCdescription(db.rs.getString("cdescription"));

                 data.put("sys", c);
             }
         } catch (SQLException e) {
             System.out.println("SQL Exception: " + e.toString());
         }

         // Einzelwert
         HashMap item = (HashMap) data.get(0);
         System.out.println("Einzelwerttest: " +item.get(""));

         // ALle Werte ausgeben
         for (HashMap<String, HashMap> c : data) {
             for (String key : c.keySet()) {
                 System.out.println(key + ": " + c.get(key));
             }
         }

     }
}

i get alwys this error: cannot find symbol at this line

data.put("sys", c);

Whats wrong ?