Best way to transfer file between two web apps

I'm looking for some architectural suggestions. Seems like a simple problem, but I'm really struggling.
-- Problem:
We have two web servers, both running apps in JBoss. I need to pass a file of roughly 20MB from one server to the other, and get the other server to process it as soon as it receives it.
-- Details:
Seems simple enough... My plan was to write a web service to pass it. Our company is all onboard the SOA train. I wrote a service that encoded the file as a byte[] and passed it. Works amazing for small files, but throws an Axis OutOfMemory error when trying to base64 encode the file. I then looked at using attachments for web services, but dismissed that. It creates malformed XML since it treats the service as a multipart MIME message wraps the webservice inside. It quickly became messy and I couldn't get it working. Seemed to defeat the purpose of an XML service too.
I've considered just doing a HTTP POST of the file to the other server, but that's poorly documented and a bit of a hack way to do it. I also considered just dropping the file in a web accessible folder, then using a web service to pass a URL and get the other server to retrieve it via HTTP. Again, not a very nice solution.
Anyone have any suggestions? Thanks.

Kimos2 wrote:
I don't have access to run/configure services on these machines, so FTP is out. It has to be JVM to JVM. Even if I did, I'd have to worry about triggering JBoss to process the file right away after it had been dropped there. I know i could poll the directory or send a message to trigger the process, there'd be synchronization issues etc to work through and seems to introduce unneeded complication.Yes, I agree with that. Having been through the polling directories and grabbing partially uploaded files scenario ad nauseam. It's much worse with large files too.
Barring any suggestions I haven't thought of, I'll probably end up settling on the HTTP POST solution. My problem is that it's providing a service without a specification and is not self-describing. No WSDL file to pass to clients that plan on using it. I would do HTTP POST as well. I didn't understand the part about "without a specification". You do have a specification, don't you? Wasn't this it: "I need to pass a file of roughly 20MB from one server to the other, and get the other server to process it as soon as it receives it." Informal, yes, but I don't have a problem with that. Post it to a URL on the receiving server and set up the receiving server to do whatever it's supposed to do with the file.

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