lib/server-core/src/main/java/org/apache/olingo/server/core/serializer/json/JsonDeltaSerializer.java [154:178]:
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      if (link != null) {
        if (link.getSource() != null) {
          json.writeStringField(Constants.ATTR_SOURCE, link.getSource().toString());
        } else {
          throw new SerializerException("DeltaLink source is null.", 
              SerializerException.MessageKeys.MISSING_DELTA_PROPERTY, "Source");
        }
        if (link.getRelationship() != null) {
          json.writeStringField(Constants.ATTR_RELATIONSHIP, link.getRelationship().toString());
        } else {
          throw new SerializerException("DeltaLink relationship is null.",
              SerializerException.MessageKeys.MISSING_DELTA_PROPERTY, "Relationship");
        }
        if (link.getTarget() != null) {
          json.writeStringField(Constants.ERROR_TARGET, link.getTarget().toString());
        } else {
          throw new SerializerException("DeltaLink target is null.", 
              SerializerException.MessageKeys.MISSING_DELTA_PROPERTY, "Target");
        }
      } else {
        throw new SerializerException("DeltaLink is null.", 
            SerializerException.MessageKeys.MISSING_DELTA_PROPERTY, "Delta Link");
      }
      json.writeEndObject();
    } catch (IOException e) {
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lib/server-core/src/main/java/org/apache/olingo/server/core/serializer/json/JsonDeltaSerializerWithNavigations.java [167:191]:
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      if (link != null) {
        if (link.getSource() != null) {
          json.writeStringField(Constants.ATTR_SOURCE, link.getSource().toString());
        } else {
          throw new SerializerException("DeltaLink source is null.",
              SerializerException.MessageKeys.MISSING_DELTA_PROPERTY, "Source");
        }
        if (link.getRelationship() != null) {
          json.writeStringField(Constants.ATTR_RELATIONSHIP, link.getRelationship().toString());
        } else {
          throw new SerializerException("DeltaLink relationship is null.",
              SerializerException.MessageKeys.MISSING_DELTA_PROPERTY, "Relationship");
        }
        if (link.getTarget() != null) {
          json.writeStringField(Constants.ERROR_TARGET, link.getTarget().toString());
        } else {
          throw new SerializerException("DeltaLink target is null.",
              SerializerException.MessageKeys.MISSING_DELTA_PROPERTY, "Target");
        }
      } else {
        throw new SerializerException("DeltaLink is null.",
            SerializerException.MessageKeys.MISSING_DELTA_PROPERTY, "Delta Link");
      }
      json.writeEndObject();
    } catch (IOException e) {
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