Hi David, Is it possible that your Kafka installation is an older version than 0.9? Or you may have used a different Kafka client major version in your job jar's dependency? This seems like an odd incompatible protocol with the Kafka broker to me, as the client in the Kafka consumer is reading null record bytes.
Regards, Gordon On September 4, 2016 at 7:17:04 AM, dbciar (da...@dbciar.co.uk) wrote: Hello Everyone, I was wondering if anyone could help shed light on where I have introduced an error into my code to get the following error: java.lang.NullPointerException at java.lang.String.<init>(String.java:556) at org.apache.flink.streaming.util.serialization.SimpleStringSchema.deserialize(SimpleStringSchema.java:34) at org.apache.flink.streaming.util.serialization.SimpleStringSchema.deserialize(SimpleStringSchema.java:27) at org.apache.flink.streaming.util.serialization.KeyedDeserializationSchemaWrapper.deserialize(KeyedDeserializationSchemaWrapper.java:39) at org.apache.flink.streaming.connectors.kafka.internal.Kafka09Fetcher.run(Kafka09Fetcher.java:227) at java.lang.Thread.run(Thread.java:745) I get this error while running a job that connects to kafka from a local deployment. Could it be to do with how I'm packaging the Jar before uploading it to the cluster? The job plan is created and deployed OK via the management website, but as soon as data is added to Kafka I get the above and the job stops. Using Kafka's own console consumer script, I validated the kafka queue and the data looks exactly like the testing data I used when reading from local files. Any help as always appreciated, Cheers, David -- View this message in context: http://apache-flink-user-mailing-list-archive.2336050.n4.nabble.com/Kafka-SimpleStringConsumer-NPE-tp8888.html Sent from the Apache Flink User Mailing List archive. mailing list archive at Nabble.com.
