It is possible to create a new File Handler with invalid log file (e.g. using a directory path as log file or location without writing permissions) without console showing some error message (action is considered successful). 
  
Steps to reproduce

1. Navigate Profile - Core - Logging - Handler - File 
2. Add new File handler using this input

relative to: jboss.server.log.dir
file path: /foo/bar

3. save (Handler was successfully created)
4. Add another handler using this input

relative to: jboss.server.log.dir
file: /foo

5. save 
6. console shows that handler was successfully created, even though exception have been logged on server side.  


Expected behavior: In second case handler shouldn't be created as obviously path ${jboss.server.log.dir}/foo is a directory (created when first logger was saved)