It doesn't matter, I had enough other to work do ;-) busy time for everybody :) Thanks for your solution approach, which confirms my understanding of the code. I already have the hibernate extension, group object, group module and portlet - for at least display/add/change/remove groups and display users within the group. | For this I extended the common files: | in: core/src/resources/portal-core-sar: | - jboss-service.xml | in: core/src/resources/portal-core-war: | - Resource.properties | - jboss-portlet.xml | - portlet.xml | - portlet-instances.xml | in identity/src/resources/hibernate: | - domain.hbm.xml | This may not be the 'non intrusive way' you proposed. It's not bad. I see that you mostly changed configuration files - natural thing to plug in new feature. As long as it doesn't change class files it's quite non intrusive ;) Only thing that may be not nice is the domain.hbm.xml file. The better way would be to create separate configuration file. So let's say we'll do something like core/src/resources/portal-core-sar/conf/hibernate/groups/hibernate.cfg.xml (your hibernate configuration) identity/src/resources/hibernate/identity/domain.hbm.xml (current file) identity/src/resources/hibernate/groups/domain.hbm.xml (your schema mapping) then you need to register 5th hibernate mbean using "org.jboss.portal.jems.hibernate.SessionFactoryBinder" in core/src/resources/portal-core-sar/META-INF/jboss-service.xml with name like "portal:service=Hibernate,type=Groups" So you will have your own SessionFactory and it will act like an addon to the portal schema. With such approach it will be easy to enable/disable your services without affecting default portal services The current content of identity package is quite fluent and may change a little. Another thing is that identity modules configuration will probably be moved from jboss-service.xml to separate a configuration file. There is early draft for that here but it's not very defined yet. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3985070#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...