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Bill Bejeck updated KAFKA-8199: ------------------------------- Description: A topology with a groupBy after a suppress operation results in a ClassCastException The following sample topology {noformat} Properties properties = new Properties(); properties.put(StreamsConfig.APPLICATION_ID_CONFIG, "appid"); properties.put(StreamsConfig.BOOTSTRAP_SERVERS_CONFIG,"localhost"); StreamsBuilder builder = new StreamsBuilder(); builder.<String, String>stream("topic") .groupByKey().windowedBy(TimeWindows.of(Duration.ofSeconds(30))).count() .suppress(Suppressed.untilTimeLimit(Duration.ofHours(1), BufferConfig.unbounded())) .groupBy((k, v) -> KeyValue.pair(k,v)).count().toStream(); builder.build(properties); {noformat} results in this exception: {noformat} java.lang.ClassCastException: org.apache.kafka.streams.kstream.internals.KTableImpl$$Lambda$4/2084435065 cannot be cast to org.apache.kafka.streams.kstream.internals.KTableProcessorSupplier{noformat} was: A topology with a groupBy after a suppress operation results in a ClassCastException The following sample topology {noformat} Properties properties = new Properties(); properties.put(StreamsConfig.APPLICATION_ID_CONFIG, "appid"); properties.put(StreamsConfig.BOOTSTRAP_SERVERS_CONFIG,"localhost"); StreamsBuilder builder = new StreamsBuilder(); builder.<String, String>stream("topic") .groupByKey().windowedBy(TimeWindows.of(Duration.ofSeconds(30))).count() .suppress(Suppressed.untilTimeLimit(Duration.ofHours(1), BufferConfig.unbounded())) .groupBy((k, v) -> KeyValue.pair(k,v)).count().toStream(); builder.build(properties); {noformat} results in this exception: {noformat} java.lang.ClassCastException: org.apache.kafka.streams.kstream.internals.KTableImpl$$Lambda$4/2084435065 cannot be cast to org.apache.kafka.streams.kstream.internals.KTableProcessorSupplier{noformat} > ClassCastException when trying to groupBy after suppress > -------------------------------------------------------- > > Key: KAFKA-8199 > URL: https://issues.apache.org/jira/browse/KAFKA-8199 > Project: Kafka > Issue Type: Bug > Components: streams > Affects Versions: 2.1.0 > Reporter: Bill Bejeck > Priority: Major > Fix For: 2.3.0 > > > A topology with a groupBy after a suppress operation results in a > ClassCastException > The following sample topology > {noformat} > Properties properties = new Properties(); > properties.put(StreamsConfig.APPLICATION_ID_CONFIG, "appid"); > properties.put(StreamsConfig.BOOTSTRAP_SERVERS_CONFIG,"localhost"); > StreamsBuilder builder = new StreamsBuilder(); > builder.<String, String>stream("topic") > .groupByKey().windowedBy(TimeWindows.of(Duration.ofSeconds(30))).count() > .suppress(Suppressed.untilTimeLimit(Duration.ofHours(1), > BufferConfig.unbounded())) > .groupBy((k, v) -> KeyValue.pair(k,v)).count().toStream(); > builder.build(properties); > {noformat} > results in this exception: > {noformat} > java.lang.ClassCastException: > org.apache.kafka.streams.kstream.internals.KTableImpl$$Lambda$4/2084435065 > cannot be cast to > org.apache.kafka.streams.kstream.internals.KTableProcessorSupplier{noformat} > > -- This message was sent by Atlassian JIRA (v7.6.3#76005)