[GitHub] [flink] lamber-ken edited a comment on issue #8583: [FLINK-11820][serialization] SimpleStringSchema handle message record which value is null

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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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