java - Can't quite understand how to delete fields properly with Hibernate -

i have many-to-many relation in database (entities participant , event)

//part of participant model @manytomany(fetch = fetchtype.lazy , cascade = { cascadetype.persist, cascadetype.merge})     @jointable(name = "participant_event",             joincolumns = {@joincolumn(name = "participant_id")},             inversejoincolumns = {@joincolumn(name = "event_id")})  //part of event model    @manytomany(fetch = fetchtype.lazy, mappedby = "events", cascade = cascadetype.all) 

right @ moment, deleting event causes deleting participants visit event. removing cascadetype.all in event model causes no result after deleting event (by deleting mean .remove). proper way delete event , keep participants?

code here

in many-to-many association, cascadetype.remove not desirable, since deletes actual entities (not associated link table entries).

the proper way delete associations dissociate entities:

public void removeevent(event event) {     events.remove(event);     event.setparticipant(null); } 

to delete event, you'd have remove participants. have this:

event deletableevent = ...;  for(iterator<participant> participantiterator = event.getparticipnts(); participantiterator.hasnext();) {     participant participant = participantiterator.next();     participant.getevents().remove(deletableevent);     participantiterator.remove(); }  entitymanager.flush(); entitymanager.remove(deletableevent);