Java Utililty Methods JDBC Connection Create

Class.forName(driverName);
return DriverManager.getConnection(driverUrl, userName, password);

try {
    return DriverManager.getConnection(url);
} catch (SQLException e) {
    return null;

Class.forName(driverClass);
return DriverManager.getConnection(url, username, password);

Class.forName(pro.getProperty("jdbc.driver"));
return DriverManager.getConnection(pro.getProperty("jdbc.url"), pro.getProperty("jdbc.username"),
        pro.getProperty("jdbc.password"));

Connection conn = null;
try {
    if (conn == null) {
        conn = DriverManager.getConnection("jdbc:phoenix:yahoo005.nicl.cs.duke.edu:2181", prop);
        ResultSet rs = conn.prepareStatement("select count(*) from nation").executeQuery();
        while (rs.next()) {
            System.out.println("row count " + rs.getInt(1));
        System.out.println("Connection established successfully");
} catch (SQLException e) {
    System.err.println("Error in getting zookeeper connection");
    e.printStackTrace();
return conn;

Class.forName((String) properties.get(DRIVER_NAME));
return DriverManager.getConnection((String) properties.get(JDBC_URL), properties);

try {
    Class.forName(DRIVER);
} catch (ClassNotFoundException e) {
    e.printStackTrace();
try {
    return DriverManager.getConnection(PROTOCOL + dbName + ";create=true");
} catch (SQLException e) {
...

try {
    final Connection conn = DriverManager.getConnection(dbUrl, dbUser, dbPassword);
    conn.setAutoCommit(true);
    return conn;
} catch (Exception e) {
    throw new RuntimeException("Cannot get connection", e);

Connection con = null;
try {
    Class.forName(driver);
    con = DriverManager.getConnection(connectionString, userName, password);
} catch (Exception e) {
    e.printStackTrace();
return con;
...

Connection conn = null;
try {
    if (!_driverMap.containsKey(driver))
        _driverMap.put(driver, (Driver) Class.forName(driver).newInstance());
    conn = DriverManager.getConnection(connectString);
} catch (SQLException ex) {
    System.out.println(String.format("driver: %s\nconnectString: %s", driver, connectString));
    throw new RemoteException("Unable to connect to SQL database", ex);
...