Spring's $.getJSON failing to trigger callback functions

After conducting extensive research, I have come across many similar issues but nothing that has provided a solution to my problem. I am facing an issue where my getJSON call is successfully calling my Spring controller and receiving JSON data in response (this has been verified), however the callback function is not being executed. There are no errors detected in the JavaScript code either.

Here is the snippet from my jsp file:

function getUserText(str)
{
    $.getJSON("selectUser.htm", { id: str }, function(user)
    {
        // The content of this callback function doesn't seem to matter
    });
}

And here is the relevant section from my controller:

@RequestMapping(value="/selectUser.htm")
public @ResponseBody String SelectUser(@RequestParam String id)
{
    Users user = userMap.get(id);

    if (user == null)
        return null;

    return createUserJSON(user);
}

Answer №1

Although I can't be certain, it seems likely that the function you've included is intended to serve as the success handler for when the ajax request completes. However, there's a chance that the request itself may not be returning as expected.

Answer №2

When encountering an invalid JSON, it indicates that either the content is malformed or the content-type is not specified correctly....

The $.getJSON function does not have an error callback defined.

For more information, you can refer to:
http://api.jquery.com/jQuery.getJSON/

To diagnose the issue, you should utilize:

$.ajax({
  url: "myurl",
  type: "GET",
  dataType: "json",
  success: function() {
    // Executed upon successful request
  },
  error: function(e) {
    // Executed when an error occurs
  },
});

Answer №3

Discovered the solution! It seems that ensuring the JSON is properly formatted is crucial. I overlooked this detail, resulting in incorrect formatting of the JSON data. Lesson learned - format matters from the start, not just during the callback function.

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