public void check() {
        try {
            InitialContext ic = new InitialContext();
            DataSource ds = (DataSource) ic.lookup("jdbc/sample");
            Connection conn = ds.getConnection();
            Statement stmt = conn.createStatement();
            ResultSet rs = stmt.executeQuery("SELECT * FROM peoples");
            while (rs.next()) {
                System.out.println(rs.getString("name"));
            }

        } catch (NamingException | SQLException ex) {
            Logger.getLogger(TestConnection.class.getName()).log(Level.SEVERE, null, ex);
        }
    }

}

Info:   RAR7114: Unable to get ClientInfo for connection
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Info:   visiting unvisited references
Info:   visiting unvisited references
Info:   visiting unvisited references
Info:   Loading application [SampleServer] at [/SampleServer]
Info:   ChessmanWorkServer was successfully deployed in 1 379 milliseconds.

Info:   Loading application [SampleServer] at [/SampleServer]
Info:   ChessmanWorkServer was successfully deployed in 323 milliseconds.
Info:   RAR7114: Unable to get ClientInfo for connection
Info:   82
Info:   84
Info:   78
Info:   63
Info:   62
Info:   58
Info:   56
Info:   52
Info:   48
Info:   44

properties.setProperty("characterEncoding","cp1251");
Connection con = DriverManager.getConnection("jdbc/sample",properties);

Properties properties=new Properties();
properties.setProperty("user","логин");
properties.setProperty("password","пароль");
properties.setProperty("useUnicode","true");
properties.setProperty("characterEncoding","cp1251");
Connection connection=DriverManager.getConnection(
"jdbc:mysql://localhost:3306/имяБазы", properties);