Undefining suffix on size-rotating-file-handler sets invalid value on suffix

1. start out-of-box standalone and connect to CLI 2. Add size handler ./subsystem=logging/size-rotating-file-handler=SIZE:add(file={relative-to= "jboss.server.log.dir" , path= "size.log" }, suffix=HH, max-backup-index=2, rotate-size=1k) ./subsystem=logging/root-logger=ROOT:add-handler(name=SIZE) 3. Reload a server once or twice to see that rotation works as expected [pkremens@dhcp-4-200 log]$ ll -rw-rw-r--. 1 pkremens pkremens 475 Oct 2 15:43 size.log -rw-rw-r--. 1 pkremens pkremens 1029 Oct 2 15:43 size.log15.1 -rw-rw-r--. 1 pkremens pkremens 1067 Oct 2 15:43 size.log15.2 4. Now undefine the suffix attribute and reload a server ./subsystem=logging/size-rotating-file-handler=SIZE:undefine-attribute(name=suffix)