Analyze how advanced security concepts are applied to develop secure code

package com.twk.restservice; import java.sql.*; public class DocData { private String id; public DocData() { } public String getId() { return id; } public void read_document(String key, String value) { /* implement read method */ //Class.forName("com.mysql.jdbc.Driver"); try { Connection con=DriverManager.getConnection( "jdbc:mysql://localhost:3306/test","root","root"); } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } //here test is database name, root is username and password } }