Value mismatch while passing attribute from Servlet to jsp

Question

Setting value in Servlet and retrieving it in jsp using RequestDispatcher

In test1Servlet :

request.setAttribute("Alpha",alpha);

RequestDispatcher rd = request.getRequestDispatcher("Test.jsp");

rd.forward(request, response);

In Test.jsp: On click of button am doing ajax call to another servlet with request attribute values

$(document).ready(function(){

  $(".button1").click(function(){
            $.ajax({

  type: "POST",

  url: "<%=request.getContextPath()%>/test2Servlet", 

 data: {"alpha":<%=request.getAttribute("alpha")%>,"ins":10},

 dataType:"text",

In this case if I set alpha value as 0017 in test1Servlet, am getting 0015 in jsp.

How this value is getting changed ?

Anyone please help me to resolve this.

Answer 1

It is no error there. You get the right value.
In many languages number preceded by zero are interpreted as octals or hexadezimal:

• OCTAL: 017 = 15
  (because the 1 is evaluated to 8 an the 7 as it is. So 1×8+7=15).
• hexadecimal: 0x17 = 1×16 + 7 = 23

Try it:

<script>
    var x = 0017;
    var y = 0x17;
    alert("x:" + x);
    alert("y:" + y);
</script>

Since the post parameters are converted to strings, you can put the values in quotes. Or avoid leading zeros in numbers.