Spring MVC ajax post text data - ajax

Question

I have a form:
<form name="employeeForm" method="post">
<table cellpadding="0" cellspacing="0" border="1" class="GridOne">
<tr>
<td>First Name</td>
<td><input type="text" name="firstName" id="firstName" value="" onchange="FirstNameAjaxCall(event);"></td>
</tr>
<tr>
<td>Last Name</td>
<td><input type="text" name="lastName" id="lastName" value=""></td>
</tr>
<tr>
<td>Email</td>
<td><input type="text" name="email" id="email" value=""></td>
</tr>
<tr>
<td colspan="2" align="center"><input type="button" value="Ajax Submit" onclick="madeAjaxCall(event);"></td>
</tr>
</table>
</form>
//====================================================
and my controller:
#RequestMapping(value="/ajaxExample", method=RequestMethod.POST)
public #ResponseBody ModelAndView firstnameAjaxTest(#RequestParam(value="text") String text) {
final ModelAndView modelAndView = new ModelAndView();
System.out.println(text);
modelAndView.setViewName("ajaxExample");
return modelAndView;
}
//===============================================
and script
function FirstNameAjaxCall(e){
e.preventDefault();
var text = document.getElementById('firstName').value;
alert(text);
$.ajax({
type: "POST",
url: "http://localhost:8080/ajaxExample",
cache: false,
dataType: 'text',
data:{
text:text
},
success: function(){
alert('Done');
},
error: function(){
alert('Error while request..');
}
});
return false;
return false;
}
And request return msg: Error while request..
I doesn understand why.
Please help me