Cassandra Sink: exception java.lang.NoClassDefFoundError: Could not initialize class com.landoop.json.sql.JacksonJson$

Hi, we are running Kafka Connect Cassandra Sink connector using com.datamountaineer.kafka-connect-cassandra v2.0.1 and got this exception below. I wonder if any of you ever seen it before. Looks like it failed when trying to insert the data from Kafka topic, which we’re using JSON format. The KCQL is pretty straightforward, i.e. “INSERT INTO tick_events SELECT event_id, event_timestamp, event_type, tick_price, tick_quantity, tick_symbol FROM kf-test-sink” I checked everything is correct, do you know what might be the culprit? Thanks!

c.d.s.c.c.s.CassandraJsonWriter | There was an error writing the records Boxed Error
java.util.concurrent.ExecutionException: Boxed Error
        at scala.concurrent.impl.Promise$.resolver(Promise.scala:87)
        at scala.concurrent.impl.Promise$.scala$concurrent$impl$Promise$$resolveTry(Promise.scala:79)
        at scala.concurrent.impl.Promise$DefaultPromise.tryComplete(Promise.scala:284)
        at scala.concurrent.Promise.complete(Promise.scala:53)
        at scala.concurrent.Promise.complete$(Promise.scala:52)
        at scala.concurrent.impl.Promise$DefaultPromise.complete(Promise.scala:187)
        at scala.concurrent.Promise.failure(Promise.scala:104)
        at scala.concurrent.Promise.failure$(Promise.scala:104)
        at scala.concurrent.impl.Promise$DefaultPromise.failure(Promise.scala:187)
        at com.datamountaineer.streamreactor.connect.concurrent.ExecutorExtension$RunnableWrapper$$anon$1.run(ExecutorExtension.scala:33)
        at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
        at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
        at java.base/java.lang.Thread.run(Thread.java:834)
Caused by: java.lang.NoClassDefFoundError: Could not initialize class com.landoop.json.sql.JacksonJson$
        at com.datamountaineer.streamreactor.connect.converters.Transform$.apply(Transform.scala:93)
        at com.datamountaineer.streamreactor.connect.cassandra.sink.CassandraJsonWriter.$anonfun$insert$2(CassandraJsonWriter.scala:187)
        at com.datamountaineer.streamreactor.connect.cassandra.sink.CassandraJsonWriter.$anonfun$insert$2$adapted(CassandraJsonWriter.scala:181)
        at scala.collection.immutable.Map$Map1.foreach(Map.scala:128)
        at com.datamountaineer.streamreactor.connect.cassandra.sink.CassandraJsonWriter.insert(CassandraJsonWriter.scala:181)
        at com.datamountaineer.streamreactor.connect.cassandra.sink.CassandraJsonWriter.$anonfun$write$4(CassandraJsonWriter.scala:161)
        at com.datamountaineer.streamreactor.connect.cassandra.sink.CassandraJsonWriter.$anonfun$write$4$adapted(CassandraJsonWriter.scala:159)
        at scala.collection.Iterator.foreach(Iterator.scala:941)
        at scala.collection.Iterator.foreach$(Iterator.scala:941)
        at scala.collection.AbstractIterator.foreach(Iterator.scala:1429)
        at scala.collection.IterableLike.foreach(IterableLike.scala:74)
        at scala.collection.IterableLike.foreach$(IterableLike.scala:73)
        at scala.collection.AbstractIterable.foreach(Iterable.scala:56)
        at com.datamountaineer.streamreactor.connect.cassandra.sink.CassandraJsonWriter.$anonfun$write$3(CassandraJsonWriter.scala:159)
        at scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.java:23)
        at com.datamountaineer.streamreactor.connect.concurrent.ExecutorExtension$RunnableWrapper$$anon$1.run(ExecutorExtension.scala:30)
        ... 3 common frames omitted

[vvash94]

@davidsloan Im having the same issue as @dberardo-com with MQTT sink connector. I have reached out on the community slack channel. It would be awesome if you could guide me on how to get past this. Thanks.

[davidsloan]

@davidsloan is there any update on when a new release (4.0.0?) including this fix is going to be issued and new binaries provided for download? Thanks!

@aromanos please see here for the new release: https://github.com/lensesio/stream-reactor/releases/tag/4.0.0