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Josep Prat commented on KAFKA-12943: ------------------------------------ There is a PR for this already: https://github.com/apache/kafka/pull/10766 > Bug in Kafka Streams Documentation (Aggregating) > ------------------------------------------------ > > Key: KAFKA-12943 > URL: https://issues.apache.org/jira/browse/KAFKA-12943 > Project: Kafka > Issue Type: Bug > Components: documentation, streams > Reporter: Rajesh KSV > Priority: Minor > > In the doc, for aggregating function, the example is incorrect > [https://kafka.apache.org/documentation/streams/developer-guide/dsl-api.html#aggregating] > It says > {code:java} > KTable<byte[], Long> aggregatedStream = groupedStream.aggregate( > () -> 0L, /* initializer */ > (aggKey, newValue, aggValue) -> aggValue + newValue.length(), /* adder */ > Materialized.as("aggregated-stream-store") /* state store name */ > .withValueSerde(Serdes.Long()); /* serde for aggregate value */{code} > Generic types are missing. Instead, it should be > {code:java} > KTable<byte[], Long> aggregatedStream = groupedStream.aggregate( > () -> 0L, /* initializer */ > (aggKey, newValue, aggValue) -> aggValue + newValue.length(), /* adder */ > Materialized.<String, Long, KeyValueStore<Bytes, > byte[]>>as("aggregated-stream-store") /* state store name */ > .withValueSerde(Serdes.Long()); /* serde for aggregate value */ {code} > Otherwise, code won't work. I myself verified it. > Reference > [https://stackoverflow.com/questions/51040555/the-method-withvalueserde-in-the-type-materialized-is-not-applicable/51049472] -- This message was sent by Atlassian Jira (v8.3.4#803005)