Problema com conexão com sql server 2012

private static final long serialVersionUID = 1L;
    private static String URL = "jdbc:sqlserver://localhost:1433;"
            + "databaseName=PetShop;";
    private static String usuario = "sa";
    private static String senha = "123";
    private static String DRIVER = "com.microsoft.sqlserver.jdbc.SQLServerDriver";

    public Connection getConnection() throws SQLException {

        try {

            Class.forName(DRIVER);
            Connection con = DriverManager.getConnection(URL, usuario, senha);
            return con;

        } catch (ClassNotFoundException e) {
            throw new SQLException(e.getMessage());

        }

    }