Great thanks, I was able to work around the issue by implementing my own KafkaRecordDeserializer. I will take a stab at a PR to fix the bug, should be an easy fix.
On Tue, Mar 9, 2021 at 9:26 AM Till Rohrmann <trohrm...@apache.org> wrote: > Hi Bobby, > > This is most likely a bug in Flink. Thanks a lot for reporting the issue > and analyzing it. I have created an issue for tracking it [1]. > > cc Becket. > > [1] https://issues.apache.org/jira/browse/FLINK-21691 > > Cheers, > Till > > On Mon, Mar 8, 2021 at 3:35 PM Bobby Richard <bobby.rich...@broadcom.com> > wrote: > >> I'm receiving the following exception when trying to use a KafkaSource >> from the new DataSource API. >> >> Exception in thread "main" java.lang.NullPointerException >> at >> org.apache.flink.connector.kafka.source.reader.deserializer.ValueDeserializerWrapper.getProducedType(ValueDeserializerWrapper.java:79) >> at >> org.apache.flink.connector.kafka.source.KafkaSource.getProducedType(KafkaSource.java:171) >> at >> org.apache.flink.streaming.api.environment.StreamExecutionEnvironment.getTypeInfo(StreamExecutionEnvironment.java:2282) >> at >> org.apache.flink.streaming.api.environment.StreamExecutionEnvironment.fromSource(StreamExecutionEnvironment.java:1744) >> at >> org.apache.flink.streaming.api.environment.StreamExecutionEnvironment.fromSource(StreamExecutionEnvironment.java:1715) >> >> Here is my code (kotlin) >> >> val kafkaSource = buildKafkaSource(params) >> val datastream = env.fromSource(kafkaSource, >> WatermarkStrategy.noWatermarks(), "kafka") >> >> private fun buildKafkaSource(params: ParameterTool): KafkaSource<String> { >> val builder = KafkaSource.builder<String>() >> .setBootstrapServers(params.get("bootstrapServers")) >> .setGroupId(params.get("groupId")) >> .setStartingOffsets(OffsetsInitializer.earliest()) >> .setTopics("topic") >> >> .setDeserializer(KafkaRecordDeserializer.valueOnly(StringDeserializer::class.java)) >> >> if (params.getBoolean("boundedSource", false)) { >> builder.setBounded(OffsetsInitializer.latest()) >> } >> >> return builder.build() >> } >> >> >> >> >> I'm setting the deserializer using the ValueDeserializerWrapper as >> described in the KafkaSourceBuilder javadoc example >> https://ci.apache.org/projects/flink/flink-docs-master/api/java/org/apache/flink/connector/kafka/source/KafkaSourceBuilder.html >> >> Looking at the code for the ValueDeserializerWrapper, it appears that the >> deserializer isn't actually set until the deserialize method is called, but >> getProducedType is actually called first resulting in the >> NullPointerException. What am I missing? >> >> Thanks, >> Bobby >> >> This electronic communication and the information and any files >> transmitted with it, or attached to it, are confidential and are intended >> solely for the use of the individual or entity to whom it is addressed and >> may contain information that is confidential, legally privileged, protected >> by privacy laws, or otherwise restricted from disclosure to anyone else. If >> you are not the intended recipient or the person responsible for delivering >> the e-mail to the intended recipient, you are hereby notified that any use, >> copying, distributing, dissemination, forwarding, printing, or copying of >> this e-mail is strictly prohibited. If you received this e-mail in error, >> please return the e-mail to the sender, delete it from your computer, and >> destroy any printed copy of it. > > -- *Bobby Richard* R&D Software Engineer | Information Security Group | Symantec Enterprise Division Broadcom mobile: 337.794.2128 Atlanta, GA (USA) bobby.rich...@broadcom.com | broadcom.com -- This electronic communication and the information and any files transmitted with it, or attached to it, are confidential and are intended solely for the use of the individual or entity to whom it is addressed and may contain information that is confidential, legally privileged, protected by privacy laws, or otherwise restricted from disclosure to anyone else. If you are not the intended recipient or the person responsible for delivering the e-mail to the intended recipient, you are hereby notified that any use, copying, distributing, dissemination, forwarding, printing, or copying of this e-mail is strictly prohibited. If you received this e-mail in error, please return the e-mail to the sender, delete it from your computer, and destroy any printed copy of it.
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