'when publish and start wildfly for the first time, it always deleting all files first and then copying

When I start the wildfly for the first time after shut down and start my notebook, I find it always delete many files and then copy many files to wildfly, but this only occur when I start the wildfly for the first time in a day, after that, when I stop the wildfly, change the code and publish, start the wildfly again, it will not delete any files, and can publish, start much faster, why?

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