Pass mesage from servlet to ajax in case of error

hi,

I am using ajax to insert a record in database through Servlet.
Record get inserted properly.
the problem is how to send the exception messages in the ajax method so that appropriate  can be displayed to user in case exception occurs?
             
$.ajax({
                         type: 'post',
                         url: 'registdata',
                         data: $('#registdataform').serialize(),
                         success: function (data) {
                              // $("#form")[0].reset();
                               alert("sucess");
                         },
                         error: function(data) {
                             // check status && error

                             
                          },
                             
                         });

how to pass message through servlet in  ajax?
RockingAsked:
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Amitkumar PConnect With a Mentor Sr. ConsultantCommented:
In any case, you should sent response with success status only. But, the response should contain at least two values: 1. result code, 2. result message and 3. data (optional).

This is how we should drive. Don't jump into various code of servlet api. Ideally, we should use it, but it make GUI more complicated.
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Amitkumar PSr. ConsultantCommented:
You can send the response with error code as well as error message and display it in the alert box.

For example:
Message code 0 (Successful)
Message code 1 (Error 1)
Message code 2 (Error 2)
and so on
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RockingAuthor Commented:
i have set the response.setStatus(500); but how to get the status on the ajax call?
An exception occurs at server side and i set the above status manually then how to retrieve in ajax call i.e in data or in success?

Because in one type of exception it goes in error and for another type exception it goes in success block? I am unable to understand why is it so?
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