Hello everybody,
I have this use case: an item is selected from a list, the edit page for that item is shown, if the save action is invoked some validation is done inside that same method, only if everything is ok I call persist, otherwise the same edit page is redisplayed.

Everything goes fine except one thing: even if validation fails (so I don't call persist) the entity is been updated, why? how? where? I reproduce some code:

@Scope(ScopeType.CONVERSATION)
@Name("courseEditor")
@Restrict("#{identity.loggedIn and s:hasRole('Administrator')}")
public class CourseEditorAction {

 @Begin(nested=true)
 public void select(Course selectedCourse) {
 course = entityManager.merge(selectedCourse);
 }

 public void save() {
 if(course.getStartDate()!=null && course.getFinishDate()!=null &&
 course.getStartDate().compareTo(course.getFinishDate())>=0) {
 facesMessages.addToControl("finishDate","must be posterior to start date") ;
 ok = false ;
 }
 else {
 sede = entityManager.merge(sede) ;
 if(course.getId()==null)
 //my way to update parent collection of courses (only if course is new)
 sede.getCourses().add(course) ;
 entityManager.persist(course);
 facesMessages.add("Course saved successfully");
 //I only finish conversation in case the edition use case finish
 Conversation.instance().end() ;
 ok = true;
 }
 }

 @End
 public void cancel() {}

 public boolean isOk() {
 return ok ;
 }
}

<page view-id="/admin/courseEditor.xhtml">
 <navigation from-action="#{courseEditor.save}">
 <rule if="#{courseEditor.ok}">
 <redirect view-id="/admin/sedeEditor.xhtml"/>
 </rule>
 <rule if="#{not courseEditor.ok}">
 <redirect view-id="/admin/courseEditor.xhtml"/>
 </rule>
 </navigation>
 <navigation from-action="#{courseEditor.cancel}">
 <redirect view-id="/admin/sedeEditor.xhtml"/>
 </navigation>

 </page>

if finish date value is before start date, the page is redisplayed, the message describing the incorrect input is shown, but at that moment the course already has been updated :S

I though maybe select method was been called every time the page is redisplayed and since there is a merge that was causing the update, but no: select method is called (makes sense) only first time.
so the updating is invoked somewhere else...
any help is much appreciated