vruc commented on issue #4721: Flink pulsar sink NotSerializableException URL: https://github.com/apache/pulsar/issues/4721#issuecomment-532742215 > > > I run into similar problem. > I follow the https://github.com/apache/pulsar/blob/master/examples/flink/src/main/java/org/apache/flink/streaming/connectors/pulsar/example/README.md and I execute the './bin/flink run -c org.apache.flink.streaming.connectors.pulsar.example.PulsarConsumerSourceWordCount ${PULSAR_HOME}/examples/flink/target/pulsar-flink-examples.jar --service-url pulsar://localhost:6650 --input-topic test_src --subscription test_sub' successfully. But when I add the parameter 'output-topic', it will throw exception. > Exception information followed： > > org.apache.pulsar.client.impl.DefaultBatcherBuilder@75d2da2d is not serializable. The object probably contains or references non serializable fields. > org.apache.flink.api.java.ClosureCleaner.clean(ClosureCleaner.java:151) > org.apache.flink.api.java.ClosureCleaner.clean(ClosureCleaner.java:126) > org.apache.flink.api.java.ClosureCleaner.clean(ClosureCleaner.java:126) > org.apache.flink.api.java.ClosureCleaner.clean(ClosureCleaner.java:71) org.apache.flink.streaming.api.environment.StreamExecutionEnvironment.clean(StreamExecutionEnvironment.java:1574) > org.apache.flink.streaming.api.datastream.DataStream.clean(DataStream.java:185) > org.apache.flink.streaming.api.datastream.DataStream.addSink(DataStream.java:1227) > org.apache.flink.streaming.connectors.pulsar.example.PulsarConsumerSourceWordCount.main(PulsarConsumerSourceWordCount.java:98) > > the version： > flink 1.9.0 > pulsar 2.4.0 > java 1.8 You can use 2.3.2 or 2.5.0-SNAPSHOT have a try. DefaultBatcherBuilder in 2.4.1 didnot extends Serializable. This is hotfix commit: https://github.com/apache/pulsar/commit/6a67ae094b5ecfa1a4602b8f7baff9a838b44e23#diff-d4876cc56bcbd7b0fe549311203cd213
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