There should be a possibility to configure that wildfly follows symbolic links.

Example which describes the problem:

$wildflyHome/welcome-content/test/index.html --> localhost:8080/test/index.html ==> works.

$wildflyHome/welcome-content/symlink/index.html --> localhost:8080/symlink/index.html ==> doesn't work.

"symlink" is the symbolic link which is created by

ln -s /path/to/symlink $wildflyHome/welcome-content