[FLINK-37830] V3.1 restore checkpoint arraylist NPE - #126
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When using flink-connector-elasticsearch8 ver. 3.1.0-1.20 with flink ver. 1.20.1, restore checkpoint state in the connector fails the NullPointerException for ArrayList:
2025-05-12 08:14:09 com.esotericsoftware.kryo.KryoException: java.lang.NullPointerException Serialization trace: _children (com.fasterxml.jackson.databind.node.ArrayNode) _children (com.fasterxml.jackson.databind.node.ObjectNode) _children (com.fasterxml.jackson.databind.node.ObjectNode) _children (com.fasterxml.jackson.databind.node.ObjectNode) _children (com.fasterxml.jackson.databind.node.ObjectNode) document (co.elastic.clients.elasticsearch.core.bulk.IndexOperation) bulkOperationVariant (org.apache.flink.connector.elasticsearch.sink.Operation) at com.esotericsoftware.kryo.serializers.ObjectField.read(ObjectField.java:125) at com.esotericsoftware.kryo.serializers.FieldSerializer.read(FieldSerializer.java:528) at com.esotericsoftware.kryo.Kryo.readClassAndObject(Kryo.java:761) at com.esotericsoftware.kryo.serializers.MapSerializer.read(MapSerializer.java:143) at com.esotericsoftware.kryo.serializers.MapSerializer.read(MapSerializer.java:21) at com.esotericsoftware.kryo.Kryo.readObject(Kryo.java:679) at com.esotericsoftware.kryo.serializers.ObjectField.read(ObjectField.java:106) at com.esotericsoftware.kryo.serializers.FieldSerializer.read(FieldSerializer.java:528) at com.esotericsoftware.kryo.Kryo.readClassAndObject(Kryo.java:761) at com.esotericsoftware.kryo.serializers.MapSerializer.read(MapSerializer.java:143) at com.esotericsoftware.kryo.serializers.MapSerializer.read(MapSerializer.java:21) at com.esotericsoftware.kryo.Kryo.readObject(Kryo.java:679) at com.esotericsoftware.kryo.serializers.ObjectField.read(ObjectField.java:106) at com.esotericsoftware.kryo.serializers.FieldSerializer.read(FieldSerializer.java:528) at com.esotericsoftware.kryo.Kryo.readClassAndObject(Kryo.java:761) at com.esotericsoftware.kryo.serializers.MapSerializer.read(MapSerializer.java:143) at com.esotericsoftware.kryo.serializers.MapSerializer.read(MapSerializer.java:21) at com.esotericsoftware.kryo.Kryo.readObject(Kryo.java:679) at com.esotericsoftware.kryo.serializers.ObjectField.read(ObjectField.java:106) at com.esotericsoftware.kryo.serializers.FieldSerializer.read(FieldSerializer.java:528) at com.esotericsoftware.kryo.Kryo.readClassAndObject(Kryo.java:761) at com.esotericsoftware.kryo.serializers.MapSerializer.read(MapSerializer.java:143) at com.esotericsoftware.kryo.serializers.MapSerializer.read(MapSerializer.java:21) at com.esotericsoftware.kryo.Kryo.readObject(Kryo.java:679) at com.esotericsoftware.kryo.serializers.ObjectField.read(ObjectField.java:106) at com.esotericsoftware.kryo.serializers.FieldSerializer.read(FieldSerializer.java:528) at com.esotericsoftware.kryo.Kryo.readObject(Kryo.java:679) at com.esotericsoftware.kryo.serializers.ObjectField.read(ObjectField.java:106) at com.esotericsoftware.kryo.serializers.FieldSerializer.read(FieldSerializer.java:528) at com.esotericsoftware.kryo.Kryo.readObject(Kryo.java:679) at com.esotericsoftware.kryo.serializers.ObjectField.read(ObjectField.java:106) at com.esotericsoftware.kryo.serializers.FieldSerializer.read(FieldSerializer.java:528) at com.esotericsoftware.kryo.Kryo.readObject(Kryo.java:657) at org.apache.flink.connector.elasticsearch.sink.OperationSerializer.deserialize(OperationSerializer.java:51) at org.apache.flink.connector.elasticsearch.sink.Elasticsearch8AsyncSinkSerializer.deserializeRequestFromStream(Elasticsearch8AsyncSinkSerializer.java:39) at org.apache.flink.connector.elasticsearch.sink.Elasticsearch8AsyncSinkSerializer.deserializeRequestFromStream(Elasticsearch8AsyncSinkSerializer.java:30) at org.apache.flink.connector.base.sink.writer.AsyncSinkWriterStateSerializer.deserialize(AsyncSinkWriterStateSerializer.java:81) at org.apache.flink.connector.base.sink.writer.AsyncSinkWriterStateSerializer.deserialize(AsyncSinkWriterStateSerializer.java:39) at org.apache.flink.core.io.SimpleVersionedSerialization.readVersionAndDeSerialize(SimpleVersionedSerialization.java:227) at org.apache.flink.streaming.api.operators.util.SimpleVersionedListState$DeserializingIterator.next(SimpleVersionedListState.java:138) at java.base/java.util.Iterator.forEachRemaining(Unknown Source) at org.apache.flink.util.CollectionUtil.iterableToList(CollectionUtil.java:119) at org.apache.flink.streaming.runtime.operators.sink.StatefulSinkWriterStateHandler.createWriter(StatefulSinkWriterStateHandler.java:103) at org.apache.flink.streaming.runtime.operators.sink.SinkWriterOperator.initializeState(SinkWriterOperator.java:163) at org.apache.flink.streaming.api.operators.StreamOperatorStateHandler.initializeOperatorState(StreamOperatorStateHandler.java:147) at org.apache.flink.streaming.api.operators.AbstractStreamOperator.initializeState(AbstractStreamOperator.java:294) at org.apache.flink.streaming.runtime.tasks.RegularOperatorChain.initializeStateAndOpenOperators(RegularOperatorChain.java:106) at org.apache.flink.streaming.runtime.tasks.StreamTask.restoreStateAndGates(StreamTask.java:858) at org.apache.flink.streaming.runtime.tasks.StreamTask.lambda$restoreInternal$5(StreamTask.java:812) at org.apache.flink.streaming.runtime.tasks.StreamTaskActionExecutor$1.call(StreamTaskActionExecutor.java:55) at org.apache.flink.streaming.runtime.tasks.StreamTask.restoreInternal(StreamTask.java:812) at org.apache.flink.streaming.runtime.tasks.StreamTask.restore(StreamTask.java:771) at org.apache.flink.runtime.taskmanager.Task.runWithSystemExitMonitoring(Task.java:970) at org.apache.flink.runtime.taskmanager.Task.restoreAndInvoke(Task.java:939) at org.apache.flink.runtime.taskmanager.Task.doRun(Task.java:763) at org.apache.flink.runtime.taskmanager.Task.run(Task.java:575) at java.base/java.lang.Thread.run(Unknown Source) Caused by: java.lang.NullPointerException at java.base/java.util.ArrayList.ensureCapacity(Unknown Source) at com.esotericsoftware.kryo.serializers.CollectionSerializer.read(CollectionSerializer.java:96) at com.esotericsoftware.kryo.serializers.CollectionSerializer.read(CollectionSerializer.java:22) at com.esotericsoftware.kryo.Kryo.readObject(Kryo.java:679) at com.esotericsoftware.kryo.serializers.ObjectField.read(ObjectField.java:106) ... 56 moreThe committed fix works for me.