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I'm making an ajax request and I have two situations, where if everything is ok I return a page which will be rendered in a modal else return empty string and don't show any modal at all.

Here is a sample of how should my controller look like:

@PostMapping(value = "/path") public String serve(final Model model) { if (everything_fine) { return "path_to_page_which_will_be_handled_by_view_controller"; } return StringUtils.EMPTY; }

and the ajax request is something like this:

 $.ajax({ type: 'POST', url: '/path', error: function (data) { //handle error }, success: function (data) { if (data) { // render response in modal } else { // show some other stuff } } });

For the situation where jsp is returned request works fine, when empty string is returned I get 404 and ajax request goes on the error branch when finished. I guess this is because view controller doesn't find any view for the empty string returned, do you have any idea how can I accomplish my scenario?

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You trying to return empty path to browser and you get 404. It's normal. Try to return String with path to controller that returns empty page:

@PostMapping(value = "/path") public String serve(final Model model) { if (everything_fine) { return "path_to_page_which_will_be_handled_by_view_controller"; } return "path_to_EMPTY_page_which_will_be_handled_by_view_controller"; }
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Eventually split this in two requests, one to get the data on which deciding if the modal will be shown or not, and finally request the modal contents if needed.

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