[xwiki-users] how to debug ObjectNotFoundException?

I recently turned log4j's root category of my xwiki to info and I get floods of the following exceptions: 2010-08-21 22:21:00,381 INFO def.DefaultLoadEventListener - Error performing load command org.hibernate.ObjectNotFoundException: No row with the given identifier exists: [com.xpn.xwiki.doc.XWikiDocument#2524421] at org.hibernate.impl.SessionFactoryImpl $1.handleEntityNotFound(SessionFactoryImpl.java:377) at org .hibernate .event.def.DefaultLoadEventListener.load(DefaultLoadEventListener.java: 145) at org .hibernate .event .def .DefaultLoadEventListener.proxyOrLoad(DefaultLoadEventListener.java:195) at org .hibernate .event .def.DefaultLoadEventListener.onLoad(DefaultLoadEventListener.java:103) at org.hibernate.impl.SessionImpl.fireLoad(SessionImpl.java: 878) at org.hibernate.impl.SessionImpl.load(SessionImpl.java:784) at com .xpn .xwiki.store.XWikiHibernateStore.loadXWikiDoc(XWikiHibernateStore.java: 611) this sounds dark and probably a performance eater (exceptions always are even if not stacktraced). Can anyone suggest me a method to identify how to avoid such errors or what they uncover? thanks in advance paul