CAUSE: Currently JBoss Cache used for Picketlink IDM is not aware of JTA. This could mean for example, that rollback of JTA transaction won't rollback JBoss Cache records, added during this JTA transaction.
WORKAROUND: Uncomment TransactionManagerLookup in configuration file gatein.ear/02portal.war/WEB-INF/conf/organization/picketlink-idm/jboss-cache.xml:
Problem is that implementing this workaround is introducing another two problems described in bugs 841320 and 840917. So applying workaround is not recommended for now.