byte[] and String payloads were written to a temporary file.
If the same message is transferred to two different destinations
concurrently, one of the adapters could remove the temporary
file while the other was using it.
Don't use a temporary file for these payloads, simply use the
payload byte[] [or a String.getBytes()] as the InputStream
passed to the Session.write() method.
Polishing
Polishing - Add WARN For Missing File
+ Test
JIRA: https://jira.springsource.org/browse/INT-3091
ae7bc5d4f7