The generated Administration section of the TicketMonster example does not contain the correct logic to delete Performances. Consequently, deleting Performances in the Administration section has no effect, or failures are encountered during the deletion. To work around the issue, add the following methods to the PerformanceBean class: public List<SectionAllocation> findSectionAllocationsByPerformance(Performance performance) { CriteriaQuery<SectionAllocation> criteria = this.entityManager .getCriteriaBuilder().createQuery(SectionAllocation.class); Root<SectionAllocation> from = criteria.from(SectionAllocation.class); CriteriaBuilder builder = this.entityManager.getCriteriaBuilder(); Predicate performanceIsSame = builder.equal(from.get("performance"), performance); return this.entityManager.createQuery( criteria.select(from).where(performanceIsSame)).getResultList(); } public List<Booking> findBookingsByPerformance(Performance performance) { CriteriaQuery<Booking> criteria = this.entityManager .getCriteriaBuilder().createQuery(Booking.class); Root<Booking> from = criteria.from(Booking.class); CriteriaBuilder builder = this.entityManager.getCriteriaBuilder(); Predicate performanceIsSame = builder.equal(from.get("performance"), performance); return this.entityManager.createQuery( criteria.select(from).where(performanceIsSame)).getResultList(); } Then replace the delete() method in the PerformanceBean class with the following method definition: public String delete() { this.conversation.end(); try { Performance deletableEntity = findById(getId()); Show show = deletableEntity.getShow(); show.getPerformances().remove(deletableEntity); deletableEntity.setShow(null); this.entityManager.merge(show); List<SectionAllocation> sectionAllocations = findSectionAllocationsByPerformance(deletableEntity); for(SectionAllocation sectionAllocation: sectionAllocations) { this.entityManager.remove(sectionAllocation); } List<Booking> bookings = findBookingsByPerformance(deletableEntity); for(Booking booking: bookings) { this.entityManager.remove(booking); } this.entityManager.remove(deletableEntity); this.entityManager.flush(); return "search?faces-redirect=true"; } catch (Exception e) { FacesContext.getCurrentInstance().addMessage(null, new FacesMessage(e.getMessage())); return null; } } After applying this workaround, Performances can be deleted in the Administration section successfully.