jboss - @PreUpdate never fired in Wildfly 8 / JPA 2.1 -

i experiencing strange effect, @preupdate hook never fires. code:

@prepersist @preupdate public void prepersist() {     if (getcreated() == null) {         setcreated(new date());         setcreatedby(loginholder.getuser());     }     setlastmodified(new date());     setmodifiedby(loginholder.getuser());  } 

although hibernate logs update (existing) entity, @prepersist fires on new items. have missed something?