Load Balancing Cluster not working with Apache HTTP Server 2.4.6 and JBoss EAP 7

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Basically you have two options – either create a cluster using JBoss own domain mode or extend you standalone configuration to contain required elements for session replication and sso.

In domain mode, most of the configurations are already present in EAP7 – just extend domain-full-ha profile.

Required changes include enabling distributable flag in your web app web.xml – simply add <distributable/> to your web.xml.
Next add single sign on flag to your undertow system: 

  <host name="default-host" alias="localhost">                                                           
     <location name="https://stackoverflow.com/" handler="welcome-content"/>                                                     
     <filter-ref name="server-header"/>                                                                 
     <filter-ref name="x-powered-by-header"/>                                                           
     <single-sign-on/>    <!-- FIXME:  enable SSO here -->                                                                              
   </host>

And enable cache container required for clustered SSO to work – this requires Infinishpan subsystem, which you might now have, if you only extended standalone-ha profile. If you do not see Infinispan subsystem, have a look at standalone-full of standalone-full-ha profiles. If you do not have it already, add web cache: 

 /subsystem=infinispan/cache-container=web/distributed-cache=concurrent:add
 /subsystem=infinispan/cache-container=web/distributed-cache=concurrent/store=file:add

Again, if you use full-ha profile of either standalone or domain mode, you will probably have these already.

Also you do not mention, if you use JBoss security domain for authorization or not. In case you use some custom auth mechanism, make sure you set the session cookie or tokens correctly – for correct domain and context etc.

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