Don’t edit standalone.xml and then restart jboss, just use jboss-cli commands. Only three steps are enough

1. Add a file log handler

/subsystem=logging/file-handler=**HANDLER_NAME**:add(file={"path"=>"**FILE_NAME**","relative-to"=>"jboss.server.log.dir"},level="**LEVEL**") > >

2. Add a log category

/subsystem=logging/logger=**CATEGORY_NAME**:add(level="**LEVEL**") > >

3. Add a log handlers to a log category

/subsystem=logging/logger=**CATEGORY_NAME**:assign-handler(name="**HANDLER_NAME**") > >

done…

By example : We have to redirect net.witr.MyClass info logs to witr.log file

[witr@WITR-PC]#cd $JBOSS_HOME
[witr@WITR-PC]#./bin/jboss-cli.sh
You are disconnected at the moment. Type 'connect' to connect to the server or 'help' for the list of supported commands.
[disconnected /] connect
[standalone@localhost:9991 /] /subsystem=logging/file-handler=WITR_HANDLER:add(file={"path"=>"witr.log","relative-to"=>"jboss.server.log.dir"},level="INFO")
[standalone@localhost:9991 /] /subsystem=logging/logger=net.witr.MyClass:add(level="INFO")
[standalone@localhost:9991 /] /subsystem=logging/logger=net.witr.MyClass:assign-handler(name="WITR_HANDLER")