JBOSS EAP 7.4 server is not restarting due below exception.
Toplink Framework , Oracle database.
Exception Description: You must login to the ServerSession before acquiring ClientSessions.
ERROR [org.jboss.msc.service.fail] (ServerService Thread Pool -- 98) MSC000001: Failed to start service jboss.deployment.subunit."cams.ear"."cams.war".undertow-deployment: org.jboss.msc.service.StartException in service jboss.deployment.subunit."cams.ear"."cams.war".undertow-deployment: Exception [TOPLINK-7001] (Oracle TopLink - 10g Release 3 (10.1.3.5.0) (Build 090715)): oracle.toplink.exceptions.ValidationException
After some time, server is restarted successfully. Our team wants to know exact root cause.