lib/server-core/src/main/java/org/apache/olingo/server/core/serializer/json/JsonDeltaSerializer.java [477:497]:
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  private String getEntityId(Entity entity, EdmEntityType entityType, String name) throws SerializerException {
    try {
      if (entity != null) {
        if (entity.getId() == null) {
          if (entityType == null || entityType.getKeyPredicateNames() == null
              || name == null) {
            throw new SerializerException("Entity id is null.", SerializerException.MessageKeys.MISSING_ID);
          } else {
            final UriHelper uriHelper = new UriHelperImpl();
            entity.setId(URI.create(name + '(' + uriHelper.buildKeyPredicate(entityType, entity) + ')'));
            return entity.getId().toASCIIString();
          }
        } else {
          return entity.getId().toASCIIString();
        }
      } 
      return null;
    } catch (Exception e) {
      throw new SerializerException("Entity id is null.", SerializerException.MessageKeys.MISSING_ID);
    }
  }
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lib/server-core/src/main/java/org/apache/olingo/server/core/serializer/json/JsonDeltaSerializerWithNavigations.java [641:661]:
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  private String getEntityId(Entity entity, EdmEntityType entityType, String name) throws SerializerException {
    try {
      if (entity != null) {
        if (entity.getId() == null) {
          if (entityType == null || entityType.getKeyPredicateNames() == null
              || name == null) {
            throw new SerializerException("Entity id is null.", SerializerException.MessageKeys.MISSING_ID);
          } else {
            final UriHelper uriHelper = new UriHelperImpl();
            entity.setId(URI.create(name + '(' + uriHelper.buildKeyPredicate(entityType, entity) + ')'));
            return entity.getId().toASCIIString();
          }
        } else {
          return entity.getId().toASCIIString();
        }
      }
      return null;
    } catch (Exception e) {
      throw new SerializerException("Entity id is null.", SerializerException.MessageKeys.MISSING_ID);
    }
  }
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