lamber-ken edited a comment on issue #8583: [FLINK-11820][serialization] SimpleStringSchema handle message record which value is null URL: https://github.com/apache/flink/pull/8583#issuecomment-499957988 hi, thanks for your commnet @aljoscha. here is detail stackstrace ``` Caused by: java.lang.NullPointerException at java.lang.String.<init>(String.java:515) at org.apache.flink.api.common.serialization.SimpleStringSchema.deserialize(SimpleStringSchema.java:75) at org.apache.flink.api.common.serialization.SimpleStringSchema.deserialize(SimpleStringSchema.java:36) at org.apache.flink.streaming.util.serialization.KeyedDeserializationSchemaWrapper.deserialize(KeyedDeserializationSchemaWrapper.java:44) at org.apache.flink.streaming.connectors.kafka.internal.Kafka09Fetcher.runFetchLoop(Kafka09Fetcher.java:142) at org.apache.flink.streaming.connectors.kafka.FlinkKafkaConsumerBase.run(FlinkKafkaConsumerBase.java:738) at org.apache.flink.streaming.api.operators.StreamSource.run(StreamSource.java:94) at org.apache.flink.streaming.api.operators.StreamSource.run(StreamSource.java:58) at org.apache.flink.streaming.runtime.tasks.SourceStreamTask.run(SourceStreamTask.java:99) at org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:300) at org.apache.flink.runtime.taskmanager.Task.run(Task.java:711) at java.lang.Thread.run(Thread.java:748) ``` <hr> #### A kafka demo example ``` import org.apache.flink.api.common.serialization.SimpleStringSchema; import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment; import org.apache.flink.streaming.connectors.kafka.FlinkKafkaConsumer010; import java.util.Properties; public class KafkaTest { public static void main(String[] args) throws Exception { StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment(); Properties p = new Properties(); p.setProperty("bootstrap.servers", "kmaster.bigdata.ly:9092"); p.setProperty("group.id", "aan"); FlinkKafkaConsumer010<String> consumer = new FlinkKafkaConsumer010("RTC_PROJECT_LOG_T_T_null", new SimpleStringSchema(), p); env.addSource(consumer).print(); env.execute(); } } ```
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