If an exception occurs on a session it should be physically closed
and not reused because its state is indeterminate and the next
operation might fail.
Note: The booleans within CachedSession do not need to be volatile
because it is a short-lived object only used by the current thread.
Also fixes the assertion message in RFT.get().
JIRA: https://jira.springsource.org/browse/INT-3266
INT-3266 Polishing - PR Comments
Remove need for SuppressWarnings.
Fix 2 test cases where the exception has an additional cause.
1d002bfc47