How would I change this so I would work on any computer?

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Java

SQL

database

I'm making a school project, at home it works in netbeans when i connect the database using java derby, but moving it to another computer, it no longer knows where the database is located, Could someone point out the mistake and tell me how to correct it so it will look for the database in a folder in the .jar file?

public boolean checkLogin(String username, String password) {

       //This code will connect the database to the java program
       Connection myconObj = null; //allows to connect to database
       Statement mystatObj = null; // create statement (Execute queries)
       ResultSet myresObj = null; // get result
       ResultSetMetaData mymeta = null;

       try {

           String query = "select * from JACOVANSTRYP.MAINUSERDATA";

           myconObj = DriverManager.getConnection("jdbc:derby://localhost:1527/MainUserData", "jacovanstryp", "Password1234");
           mystatObj = myconObj.createStatement();
           myresObj = mystatObj.executeQuery(query);
           mymeta = myresObj.getMetaData();
           int colomnNo = mymeta.getColumnCount();

           while (myresObj.next()) {
               String dbUsername = myresObj.getString("Username");
               String dbPassword = myresObj.getString("Password");
               System.out.println();
               if (username.equalsIgnoreCase(dbUsername) && password.equals(dbPassword)) {

                   PrintWriter activeUser = new PrintWriter(new FileWriter("activeUser.db"));
                   activeUser.println(dbUsername);
                   activeUser.close();
                   return true;
               }
           }

       } catch (Exception e) {
           e.printStackTrace();
       }

       return false;
   }

What I have tried:

Creating a URL location to the database, it just says Driver not found

DriverManager.getConnection("jdbc:derby://Path/To/Jar/Folder/MainUserData", "jacovanstryp", "Password1234");