code: @Beta
      public static Type getMapping(final String eventType) {
          if (!containsMappingFor(eventType)) {
              return null;
          } else {
              return systemEventMappings.get(canonicalizeEventType(eventType));
          }
      }
docs: Get Java model type for the given event type.
  
  @param eventType the event type.
  @return the Java model type if mapping exists, null otherwise.