java - Problem uploading a file with ajax in appengine -

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i need send content of file spring webservice ajax in google appengine application. i've used jquery ajaxfileupload plugin.

<form id="load_form" action="" enctype="multipart/form-data">            <input name="file" type="file" id="upload_files" value="browse"/>     <input type="button"" id="upload_file" value="load file"/> </form>

the javascript looks this:

$("#upload_file").click(function(){          $.ajaxfileupload         (             {                 url: '/myproject/uploadfile.json',                 secureuri: false,                 fileelementid: 'upload_files',                 datatype: 'json',                 success: function (data, status) {                     alert("ok");                 },                 error: function (data, status, e) {                     alert("error");                 }             }         );          return false;     });

and in controller:

@requestmapping(value="/uploadfile.json", method=requestmethod.post) public map<string, object> readfile(         @requestparam(value = "file", required=false) multipartfile file,         model model) throws exception{     ... }

the problem i'm having i'm not receiving in file parameter file content (it's null) , firebug can see i'm sending content of file in parameter called "file". i'm not receiving them though method invoked (i have breakpoint in , stops in it). if remove required=false file param 400 error given, looks cannot find file param.

i'm using spring 3.0.4.

any idea of may happening?

thanks.

if result oriented in case, can use custom servlet.


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