Exceptions with AsyncFileTransferClient and SFTP shared keys

[support2]

I have just emailed support. Can you please have someone look at this ASAP? We are getting close to launch and this looks like it may be interfering with the application running and pulling the data in a timely fashion.

Ok, if anyone's interested, here's a PSA to NOT try and re-use the AsyncResult.getClient() and use that for any of the synchronous methods. At least, not without calling endAsync() first.

[support2]

For AsyncFileTransferClient the rule is to NOT call a synchronous method from inside an asynchronous method's callback.

The synchronous method call in the callback will be waiting to get a free connection, while your asynchronous call that resulted in the callback has not yet freed the connection (and can't until the synch call has completed). Deadlock if you only have one connection. Even with more than one connection, as soon as you have multiple asynchronous method calls you get the same result.

So only use asynchronous methods inside asynchronous method callbacks.