How to submit two forms once in one jsp page?

hello all,
My jsp page includes two forms: one form's action is a File Upload servlet, which process file uploading; another is a general servlet to collect user inputs, such as user name, age, etc.
Because the file upload servlet is a legacy component, and it was used in many applications. we could not meger it into our business components.
the system requires the file upload and information collection are submitted once. so we have to submit two forms in one 'Submit' action, at the same time, the information collection servlet need get the information from file upload servlet, such as the uploaded file's url.
I have tried two methods, but all failed
1. Upload form has no a 'Submit' button, when user click the 'submit' button of the information collection form, we use a javascript to submit upload form first, then submit information collection form. Failed at: the second submit dose wait for upload finishing, then the second submit interrupt the upload
2. the javascript only submit upload form, and set HTML body's onUnload event to another javascript that submit information collection form. this time, the file upload sucess, and information collection form sucess at most time. But fail when user click the 'refresh' or 'back' or any navigator buttons of the browser. these action will trigger the page 'unload' event too, but the submit if invalid!
Please tell me how to.

chain the both requests!
- build one mutlitpart request and send it to a servlet that can handle that multipart request (think of using oreilly MultiPartParser).
- check the input (all requiered fields and files there)
- if yes store the user fields and create a socket connection from your servlet to the legacy file upload servlet and post the file this way.
- like this you have full control over the users input and can make sure the file and the fields are just save if all requiered elements are availble.

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