Uploaded image for project: 'Java Driver'
  1. Java Driver
  2. JAVA-2419

org.bson.codecs.IterableCodec throws NPE when decoding ARRAYs

    • Type: Icon: Bug Bug
    • Resolution: Done
    • Priority: Icon: Major - P3 Major - P3
    • 3.5.0
    • Affects Version/s: 3.4.0
    • Component/s: Codecs
    • None

      Assuming you have a structure like the following within mongo db and try to decode it manually, not using org.bson.codecs.DocumentCodec a NullPointerException is being thrown if you trty to decode a nested ARRAY structure.

      database-object:

      { "_id" : ObjectId("585d002202ef6c0c985cd350"), "listOfList" : [ [ ] ] }

      Stacktrace:

      java.lang.NullPointerException
      	at org.bson.codecs.IterableCodec.readValue(IterableCodec.java:118)
      	at org.bson.codecs.IterableCodec.decode(IterableCodec.java:78)
      	at org.bson.codecs.IterableCodec.decode(IterableCodec.java:37)
      

      SampleCode to replay:

              Codec<List> listCodec = mongoClient.getMongoClientOptions().getCodecRegistry().get(List.class);
              List decode = listCodec.decode(new JsonReader("[ [ ] ]"), DecoderContext.builder().build());
      

      Remark:
      If using the org.bson.codecs.DocumentCodec array structures are handled by org.bson.codecs.DocumentCodec itself, so there the problem does not exist.

      I am not 100% sure tht IterableCodec should be able to handle Arrays, I just saw the comments in org.bson.codecs.BsonTypeClassMap stating that ARRAYS are supported. Unfortunately there is no mapping in th defaults section.

            Assignee:
            jeff.yemin@mongodb.com Jeffrey Yemin
            Reporter:
            michael.weber@bild.de Michael Weber
            Votes:
            0 Vote for this issue
            Watchers:
            2 Start watching this issue

              Created:
              Updated:
              Resolved: