SessionCustomizer DirectMapMapping

//The entity with mapping: TargetClass.class, this class containes externalAttendee externalAttendee field bind to @Column("AttendeeID")
//Table with structure AttendeeId | key | value:  AttendeeProperties


ClassDescriptor cd = session.getClassDescriptor(TargetClass.class);
DirectMapMapping dmm = new DirectMapMapping();
dmm.dontUseIndirection();
dmm.setReferenceTableName("AttendeeProperties");
dmm.setDirectKeyFieldName("AttendeeProperties.key");
dmm.setDirectFieldName("AttendeeProperties.value");
dmm.setAttributeName("externalAttendee");
dmm.addReferenceKeyFieldName("AttendeeID", "AttendeeID");

        cd.addMapping(dmm);