code: public void setEntity_ref(Entity v) {
      if (EntityMention_Type.featOkTst && ((EntityMention_Type)jcasType).casFeat_entity_ref == null)
        jcasType.jcas.throwFeatMissing("entity_ref", "de.julielab.jules.types.ace.EntityMention");
      jcasType.ll_cas.ll_setRefValue(addr, ((EntityMention_Type)jcasType).casFeatCode_entity_ref, jcasType.ll_cas.ll_getFSRef(v));}
docs: setter for entity_ref - sets
  @generated
  @param v value to set into the feature