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UDP file transfer can be done with DatagramSockets and DatagramPacket.

You can find many online tutorials with googling.

Here is one link which i found overviews the Datagram approach.
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First, extending ValidatorForm doesnt mean validations will be done at client. I order to make vaidations to be done at client side make sure include <html:script> tag in your jsp page.

You are...

There are several technlogies existing under J2EE to deal with specific problems. So could you please breif your project specification?