I'm using entity beans with a date property:

@Column(name="edate", nullable=true) // uses java.util.Date
 public Date getDate() { return date; }

Problem is, that em.merge(entity) and em.find(entity) return different results: E.g:

2005-11-05 19:59:18,908 DEBUG [SocketServerInvokerThread-141.44.198.37-22:net.mdlug.lugmanager.server.EventBean:248]
- ###################merge:date=1131145200002
2005-11-05 19:59:18,917 DEBUG [SocketServerInvokerThread-141.44.198.37-22:net.mdlug.lugmanager.server.EventBean:253]
- ###################merge:date=1131145200002
2005-11-05 19:59:19,025 DEBUG [SocketServerInvokerThread-141.44.198.37-22:net.mdlug.lugmanager.server.EventBean:61]
- ###################em.find id=1 1131145200000

...
 public Event merge(Event ec) {
 if (log.isDebugEnabled()) {
 log.debug("###################merge:date="
 + ((ec.getDate() != null) ? ec.getDate().getTime() : ""));
 }
 ec = em.merge(ec);
 if (log.isDebugEnabled()) {
 log.debug("###################merge:date="
 + ((ec.getDate() != null) ? ec.getDate().getTime() : ""));
 }
 return ec;
 }
 public Event getEvent(int id) {
 Event e = em.find(Event.class, id);
 if (log.isDebugEnabled() && e != null) {
 log.debug("###################em.find id=" + id + " "
 + (e.getDate() == null ? "" : e.getDate().getTime()));
 }
 return e;
 }

So I guess this is a bug, since merge does not return the instance, the state has been merged too ...