Problem to get connection from DAO class to JDBC

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Problem to get connection from DAO class to JDBC

package controller;

import java.sql.Connection; import java.sql.DriverManager; public class ConnectionProvider { private static Connection con=null; //static Connection con=null; static{ try{ Class.forName("DRIVER"); con = DriverManager.getConnection("URL,USERNAME,PASSWORD"); }catch(Exception e){} } public static Connection getCon(){

    return con;
}

}

and interface was package controller;

public interface Provider { String DRIVER="oracle.jdbc.driver.OracleDriver";
String URL="jdbc:oracle:thin:@localhost:1521/orcla";
String USERNAME="scott";
String PASSWORD="tiger"; }

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