We had a bug on Linux that the @ViewScoped annotation didn't work for AJAX requests. We found out, that the Mojarra version is causing the problem. On our Windows development machines everything worked fine, but on the Linux production server @ViewScoped didn't work.
So we searched for the root cause and found out, that the Mojarra version was different on Linux.
The Linux package of Wildfly contains an older version of Mojarra (2.1.7) within the modules/com/sun/jsf-impl folder that needs to be deleted.
The Windows package of Wildfly doesn't even contain a com folder within modules.
So maybe the whole com folder on Linux is wrong?