Now , we encounter a problem which excepiton is "Unable to get managed connection for gatein-idm_portal; - nested throwable: (javax.resource.ResourceException: Unable to get managed connection for XXXX-idm_portal)" ,  before it occurs , there will be some info like 'INFO  [portal:PortalSessionListener] (ajp-127.0.0.1-8009-2) portal' portal'  which may happen 10 times, so now i want to ask can you guys give me some tips about where or which class we will access the db when we access the portal page . I just want to check how to deal with the connection issue .