why i can't use MsnFileTransferListener

[lan zw]

i wrote a msn robot days ago  .you can post text message to the website through the robot by MSN client.and now i want to achieve the function of FileTransfer .I implement the FileTransfer interface
like as :
public void fileTransferRequestReceived(MsnFileTransfer transfer)
public void fileTransferFinished(MsnFileTransfer transfer)
public void fileTransferStarted(MsnFileTransfer transfer)
public void fileTransferProcess(MsnFileTransfer transfer)
but made me disappointment .none of them does any work .
so i wondering JML can does the work of FileTransfer  .any suggestion i will thanks very much  ..

[lan zw]

it's so strange that it doesn't get in all above method but  get in the method of p2pMessageReceived
the code followwing :
public void p2pMessageReceived(MsnSwitchboard switchboard,
        MsnP2PMessage p2pmessage, MsnContact contact)

so  .whatever the method get in  .what can i get the transfer file ??