hibernateSession.refresh();

09:23:51,530 ERROR [STDERR] java.lang.IllegalArgumentException: Attempt to generate refresh event with null object
09:23:51,531 ERROR [STDERR] at org.hibernate.event.RefreshEvent.(RefreshEvent.java:19)
09:23:51,531 ERROR [STDERR] at org.hibernate.impl.SessionImpl.refresh(SessionImpl.java:886)
09:23:51,531 ERROR [STDERR] at org.jboss.seam.persistence.HibernateSessionProxy.refresh(HibernateSessionProxy.java:351)

ilgili class'taki hibernateSession.refresh(unit);

// hibernateSession.refresh(unit); kaldırılmalı.