multipart/form-data from xsjs to java

Hi ,

I'm trying to send a "multipart/form-data" of POST method from xsjs and in turn calls Java method .

xsjs

  var request = new $.web.WebRequest($.net.http.POST,"/entity");

  request.headers.set("Content-Type","multipart/form-data");

  request.setBody(contents);

But in java when I do ,

  Collection <Part> Parts = request.getParts();

it returns null  , whereas when I do :

InputStream is =request.getInputStream();

it returns proper value . I want my data to be in Parts. What should I do ?