container/src/main/java/com/streamsets/datacollector/record/HeaderImpl.java
public void setStageCreator(String stateCreator) {
    Preconditions.checkNotNull(stateCreator, "stateCreator cannot be null");
    map.put(STAGE_CREATOR_INSTANCE_ATTR, stateCreator);
  }
public void setStageCreator(String stateCreator) {
    Preconditions.checkNotNull(stateCreator, "stateCreator cannot be null");
    map.put(STAGE_CREATOR_INSTANCE_ATTR, stateCreator);
  }
HeaderImpl setter methods