$
.ajax({
     type: 'GET',
    url : "attendancePercentage",
    dataType: "json",
    data : {"stdate": stdate, "endate": endate},
    success : function(data, status) {
        alert(status);
        alert(data);
    }
});

List<StudentMark> stList = new ArrayList<StudentMark>();

   try {
        Class.forName("com.mysql.jdbc.Driver");
        Connection con = DriverManager.getConnection(
                "jdbc:mysql://localhost:3306/test_schema", "root", "root");
        String sql = "select * from attendance where attendance.date>=? and attendance.date<=?";

        PreparedStatement pstmt = con.prepareStatement(sql);
        pstmt.setString(1, stDate);
        pstmt.setString(2, enDate);

        rs = pstmt.executeQuery();
        while (rs.next()) {
            StudentMark ge = new StudentMark();

            ge.setStudentName(rs.getString(3));
            ge.setDate(rs.getString(2));
            ge.setStatus(rs.getString(4));
            //System.out.println(("&&&&&..." + ge));

            stList.add(ge);
            //System.out.println("ge :" + ge.getStudentName()+","+ge.getDate()+","+ge.getStatus());

        }

        System.out.println("list>>"+stList);
        System.out.println("list>>"+json);//[{"","",""}]

    } catch (Exception e) {
        System.err.println(e.getMessage());
    }