If the class has non-serializable members, you need to initialize them "lazily" when the objects are already in the distributed execution (after serializing / distributing them).
Making a Scala 'val' a 'lazy val' often does the trick (at minimal performance cost). On Thu, Aug 4, 2016 at 3:56 AM, Jack Huang <jackhu...@mz.com> wrote: > Hi all, > > I want to read a source of JSON String as Scala Case Class. I don't want > to have to write a serde for every case class I have. The idea is: > > val events = env.addSource(new FlinkKafkaConsumer09[Event]("events", new > JsonSerde(classOf[Event]), kafkaProp)) > > > > I was implementing my own JsonSerde with Jackson/Gson, but in both case I > get the error > > Task not serializable > > org.apache.flink.api.scala.ClosureCleaner$.ensureSerializable(ClosureCleaner.scala:172) > org.apache.flink.api.scala.ClosureCleaner$.clean(ClosureCleaner.scala:164) > > org.apache.flink.streaming.api.scala.StreamExecutionEnvironment.scalaClean(StreamExecutionEnvironment.scala:568) > > org.apache.flink.streaming.api.scala.StreamExecutionEnvironment.addSource(StreamExecutionEnvironment.scala:498) > com.fractionalmedia.stream.PricerEvent$.main(PricerEvent.scala:100) > > > It seems that both Jackson and Gson have classes that is not serializable. > > I couldn't find any other solution to perform this JSON-to-Case-Class > parsing, yet it seems a very basic need. What am I missing? > > > Thanks, > Jack > > > >