Technical references : Administration : Restarting the server
Restarting the server
Restarting the application server
Restarting the application server is nothing more than restarting the service. Under normal operations no other actions are needed. But it can happen the server gets polluted due to network hiccups or other interruptions, which require a complete clean startup:
1. Stop the service.
2. Remove the following folders located in ...\Server\wildfly-* \standalone\
data\bundlecache
data\tx-object-store
tmp
data\tmp
3. Start the server.
* 
Do not delete the other folders in the data folder. These folders contain unprocessed data. If removed, it may lead to data loss. Only if the application server will not start at all anymore, you can also clean up these folders. But keep in mind unprocessed work will be gone.