Java Utililty Methods JDBC MySQL Connection

Connection connection = null;
try {
    Class.forName("org.gjt.mm.mysql.Driver").newInstance(); 
    connection = DriverManager.getConnection(conn_string);
    return connection;
} catch (Exception e) {
    e.printStackTrace();
return null;

try {
    Class.forName("com.mysql.jdbc.Driver");
    String url = "jdbc:mysql://localhost:3306/banco07";
    con = DriverManager.getConnection(url, "root", "");
    con.setAutoCommit(true);
    return con;
} catch (ClassNotFoundException e) {
    e.printStackTrace();
...

String ip = serverProperties.getProperty("database.server.ip");
String port = serverProperties.getProperty("database.server.port");
String name = serverProperties.getProperty("database.name");
String userName = serverProperties.getProperty("database.username");
String password = serverProperties.getProperty("database.password");
String url = "jdbc:mysql://" + ip + ":" + port + "/" + name + "";
Connection con = null;
try {
...

if (conn != null) {
    return conn;
try {
    Class.forName(JDBC_DRIVER);
    conn = DriverManager.getConnection(DB_URL, USER, PASS);
} catch (ClassNotFoundException | SQLException e) {
    e.printStackTrace();
...

Connection con = null;
try {
    Class.forName(jdbc);
    con = DriverManager.getConnection(sqlHome + other, userName, passWord);
} catch (ClassNotFoundException e) {
    e.printStackTrace();
} catch (SQLException e) {
    e.printStackTrace();
...

try {
    Connection connection = DriverManager.getConnection(URL, USER, PASSWORD);
    return connection;
} catch (Exception e) {
    throw new RuntimeException(e);

Class.forName(mysqlDriver);
conn = DriverManager.getConnection(mysqlURL, username, password);
return conn;

String url = "jdbc:mysql://xxxxinstance.xxxxxxx.us-east-1.rds.amazonaws.com:3306/";
String userName = "xxxxxxxxx";
String password = "xxxxxxxxx";
String dbName = "xxxxxxxx";
String driver = "com.mysql.jdbc.Driver";
Connection connection = null;
try {
    Class.forName("com.mysql.jdbc.Driver");
...

try {
    DriverManager.registerDriver((Driver) Class.forName("com.mysql.jdbc.Driver").newInstance());
    String url = "jdbc:mysql://" + 
            "localhost:" + 
            "3306/" + 
            "db_example?" + 
            "user=tully&" + 
            "password=tully"; 
...

if (null == conn) {
    try {
        conn = DriverManager.getConnection(url, user, psw);
    } catch (SQLException e) {
        e.printStackTrace();
        throw new RuntimeException(e);
return conn;