JBOSS global modules is one of the best feature provided by JBOSS to share all common jars / libraries in one place to be used across all WAR / EARs deployed.

To used jboss global modules we need to writed module.xml with list of jars under
/export/opt/jboss/jboss-eap-6.3/modules//../

/module.xml

Example : /export/opt/jboss/jboss-eap-6.3/modules/com/abc/main/module.xml

After having this module.xml and copying the required jars into dir :
/export/opt/jboss/jboss-eap-6.3/modules/com/abc/main

We need to add entry to the
domain.xml


               
                  
               
                false
                true
                false
   

But this is very important to add under rite profile. For example if you want to share these global modules under default profile your servers also should fall under the same default profile.
If you server exists under a group which follows full profile you should have this entry in the full profile.