[Axis2] MTOM Large file sending problem

[Thilina Gunarathne]

Hi all,
After further investigating in to recent reports of MTOM not being able to send large files, I found out that the problem lies with the Async invocation.
In the sync+file caching everything works fine and smoothly for server uploads, without giving any noticeable increase of memory usage. But server gets out of memory exception  when trying to echo back the received attachment. Reason may be the same as for the following async case.

In the Async case memory usage goes high, proportionally to the attachment size. It seems Axis2 is trying to read the attachment in to memory in the async case. I went on debugging and still didn't get any clue. This is a very strange behaviour, cause both sync and async internally use the same code base, except for the new thread.

I would be glad if somebody can shed some light on to this. Any pointers would be great.

Thanks,
~Thilina
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