This message is output because the internal database (/resin-data) could not be closed properly when Resin was stopped.
There is no problem in operation because the internal database is being recovered when the "unclean shutdown" message is output.
*This symptom occurs when there is no opportunity to properly close the internal database when Resin is stopped.
For example, this applies when it is started with the command "resin.exe console" and stopped with CTRL+C, or when the process is killed.
In order to properly close and stop the internal database, it is desirable to start it with the command "resin.exe start" and stop it with "resin.exe stop", but in this case
due to a bug in Resin currently released also outputs "unclean shutdown".
0005554: Startup always reports unclean shutdown
http://bugs.caucho.com/view.php?id=5554
[Postscript]
http://bugs.caucho.com/view.php?id=5554
The above Resin bugs have been fixed in 4.0.40.
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iAP/Accel Platform/All Updates
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FAQID:440