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@Kishore, thanks for the tip about it being related to transactions.....
The warning is more than a warning. The request is handled by WLS but the response is never returned. So how that relates to previous transactions would love to know? ;-) Something is corrupting the transactions if there are tlog files over.
We are 2 situations when the onRecovery warning demands a restart of the application server. First is inside a round-robin from Tuxedo to 2 WLS clusters with one node each. We bounce the one node and since the WTC server is activated prior to EJB services (that means Tuxedo can communicate with WTC and ask after services) some transactions fail due to the aforementioned lack of a response. The other case is a quiet environment for about a day. Tuxedo thereafter starts a call and never gets a response.
Added full WTC debugging to a functional environment where the onRecovery pops up. With tack on more info to this post when I get something there.
WTC looks like it goes through an initialize state of logging, translation services, Tuxedo Connection manager then a stage of "reading external" and then preparing "onRecovery" of Tuxedo Loggable.