SAM / Storm Error on Deserializing

[#1]

org.apache.avro.AvroRuntimeException: Malformed data. Length is negative: -53 at org.apache.avro.io.BinaryDecoder.doReadBytes(BinaryDecoder.java:336) at org.apache.avro.io.BinaryDecoder.readString(BinaryDecoder.java:263) at org.apache.avro.io.ResolvingDecoder.readString(ResolvingDecoder.java:201) at org.apache.avro.generic.GenericDatumReader.readString(GenericDatumReader.java:363) at org.apache.avro.generic.GenericDatumReader.readString(GenericDatumReader.java:355) at org.apache.avro.generic.GenericDatumReader.read(GenericDatumReader.java:157) at org.apache.avro.generic.GenericDatumReader.readField(GenericDatumReader.java:193) at org.apache.avro.generic.GenericDatumReader.readRecord(GenericDatumReader.java:183) at org.apache.avro.generic.GenericDatumReader.read(GenericDatumReader.java:151) at org.apache.avro.generic.GenericDatumReader.read(GenericDatumReader.java:142) at com.hortonworks.registries.schemaregistry.serdes.avro.AbstractAvroSnapshotDeserializer.buildDeserializedObject(AbstractAvroSnapshotDeserializer.java:165) at com.hortonworks.registries.schemaregistry.serdes.avro.AvroSnapshotDeserializer.doDeserialize(AvroSnapshotDeserializer.java:90) at com.hortonworks.streamline.streams.runtime.storm.spout.AvroStreamsSnapshotDeserializer.doDeserialize(AvroStreamsSnapshotDeserializer.java:46) at com.hortonworks.streamline.streams.runtime.storm.spout.AvroStreamsSnapshotDeserializer.doDeserialize(AvroStreamsSnapshotDeserializer.java:39) at com.hortonworks.registries.schemaregistry.serde.AbstractSnapshotDeserializer.deserialize(AbstractSnapshotDeserializer.java:149) at com.hortonworks.streamline.streams.runtime.storm.spout.AvroKafkaSpoutTranslator.apply(AvroKafkaSpoutTranslator.java:61) at org.apache.storm.kafka.spout.KafkaSpout.emitTupleIfNotEmitted(KafkaSpout.java:335) at org.apache.storm.kafka.spout.KafkaSpout.emit(KafkaSpout.java:316) at org.apache.storm.kafka.spout.KafkaSpout.nextTuple(KafkaSpout.java:236) at org.apache.storm.daemon.executor$fn__10364$fn__10379$fn__10410.invoke(executor.clj:647) at org.apache.storm.util$async_loop$fn__553.invoke(util.clj:484) at clojure.lang.AFn.run(AFn.java:22) at java.lang.Thread.run(Thread.java:745)

[#2]

I get the same error. It seems to be related to timestamps. I am transforming timestamps from text into long format with nifi using Schema Registry, and then, using a Schema with the exact same content as the Avro writer in NiFi, SAM cannot parse the incoming data, seemingly expecting a String-Format timestamp.