odata2-lib/odata-client-core/src/main/java/org/apache/olingo/odata2/client/core/ep/deserializer/JsonPropertyDeserializer.java [266:324]:
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      throws EdmException, EntityProviderException, IOException {
    if (reader.peek().equals(JsonToken.NULL)) {
      reader.nextNull();
      if ((readProperties == null || readProperties.isValidatingFacets()) && complexPropertyInfo.isMandatory()) {
        throw new EntityProviderException(EntityProviderException.INVALID_PROPERTY_VALUE.addContent(complexPropertyInfo
            .getName()));
      }
      return null;
    }

    reader.beginObject();
    Map<String, Object> data = new HashMap<String, Object>();

    Map<String, Object> mapping;
    if (typeMapping != null) {
      if (typeMapping instanceof Map) {
        mapping = (Map<String, Object>) typeMapping;
      } else {
        throw new EntityProviderException(EntityProviderException.INVALID_MAPPING.addContent(complexPropertyInfo
            .getName()));
      }
    } else {
      mapping = new HashMap<String, Object>();
    }

    while (reader.hasNext()) {
      final String childName = reader.nextName();
      if (FormatJson.METADATA.equals(childName)) {
        readAndCheckTypeInfo(reader,
            complexPropertyInfo.getType().getNamespace() + Edm.DELIMITER + complexPropertyInfo.getType().getName());
      } else {
        EntityPropertyInfo childPropertyInfo = complexPropertyInfo.getPropertyInfo(childName);
        if (childPropertyInfo == null) {
          throw new EntityProviderException(EntityProviderException.INVALID_PROPERTY.addContent(childName));
        }
        Object childData = readPropertyValue(reader, childPropertyInfo, mapping.get(childName), readProperties);
        if (data.containsKey(childName)) {
          throw new EntityProviderException(EntityProviderException.DOUBLE_PROPERTY.addContent(childName));
        }
        data.put(childName, childData);
      }
    }
    reader.endObject();
    return data;
  }

  protected void readAndCheckTypeInfo(final JsonReader reader, String expectedTypeName)
          throws IOException, EntityProviderException {
    reader.beginObject();
    if (!FormatJson.TYPE.equals(reader.nextName())) {
      throw new EntityProviderException(EntityProviderException.MISSING_ATTRIBUTE.addContent(FormatJson.TYPE)
          .addContent(FormatJson.METADATA));
    }
    final String actualTypeName = reader.nextString();
    if (!expectedTypeName.equals(actualTypeName)) {
      throw new EntityProviderException(EntityProviderException.INVALID_ENTITYTYPE.addContent(expectedTypeName)
          .addContent(actualTypeName));
    }
    reader.endObject();
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odata2-lib/odata-core/src/main/java/org/apache/olingo/odata2/core/ep/consumer/JsonPropertyConsumer.java [250:308]:
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      throws EdmException, EntityProviderException, IOException {
    if (reader.peek().equals(JsonToken.NULL)) {
      reader.nextNull();
      if ((readProperties == null || readProperties.isValidatingFacets()) && complexPropertyInfo.isMandatory()) {
        throw new EntityProviderException(EntityProviderException.INVALID_PROPERTY_VALUE.addContent(complexPropertyInfo
            .getName()));
      }
      return null;
    }

    reader.beginObject();
    Map<String, Object> data = new HashMap<String, Object>();

    Map<String, Object> mapping;
    if (typeMapping != null) {
      if (typeMapping instanceof Map) {
        mapping = (Map<String, Object>) typeMapping;
      } else {
        throw new EntityProviderException(EntityProviderException.INVALID_MAPPING.addContent(complexPropertyInfo
            .getName()));
      }
    } else {
      mapping = new HashMap<String, Object>();
    }

    while (reader.hasNext()) {
      final String childName = reader.nextName();
      if (FormatJson.METADATA.equals(childName)) {
        readAndCheckTypeInfo(reader,
            complexPropertyInfo.getType().getNamespace() + Edm.DELIMITER + complexPropertyInfo.getType().getName());
      } else {
        EntityPropertyInfo childPropertyInfo = complexPropertyInfo.getPropertyInfo(childName);
        if (childPropertyInfo == null) {
          throw new EntityProviderException(EntityProviderException.INVALID_PROPERTY.addContent(childName));
        }
        Object childData = readPropertyValue(reader, childPropertyInfo, mapping.get(childName), readProperties);
        if (data.containsKey(childName)) {
          throw new EntityProviderException(EntityProviderException.DOUBLE_PROPERTY.addContent(childName));
        }
        data.put(childName, childData);
      }
    }
    reader.endObject();
    return data;
  }

  protected void readAndCheckTypeInfo(final JsonReader reader, String expectedTypeName)
          throws IOException, EntityProviderException {
    reader.beginObject();
    if (!FormatJson.TYPE.equals(reader.nextName())) {
      throw new EntityProviderException(EntityProviderException.MISSING_ATTRIBUTE.addContent(FormatJson.TYPE)
          .addContent(FormatJson.METADATA));
    }
    final String actualTypeName = reader.nextString();
    if (!expectedTypeName.equals(actualTypeName)) {
      throw new EntityProviderException(EntityProviderException.INVALID_ENTITYTYPE.addContent(expectedTypeName)
          .addContent(actualTypeName));
    }
    reader.endObject();
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