Error while writing the new state

[maiakhoa]

java.lang.RuntimeException: java.util.concurrent.ExecutionException: java.lang.NullPointerException
	at com.netflix.hollow.api.producer.HollowIncrementalCyclePopulator.addRecords(HollowIncrementalCyclePopulator.java:144) ~[golftec-api-1.0-jar-with-dependencies.jar:na]
	at com.netflix.hollow.api.producer.HollowIncrementalCyclePopulator.populate(HollowIncrementalCyclePopulator.java:53) ~[golftec-api-1.0-jar-with-dependencies.jar:na]
	at com.netflix.hollow.api.producer.HollowProducer.runCycle(HollowProducer.java:438) [golftec-api-1.0-jar-with-dependencies.jar:na]
	at com.netflix.hollow.api.producer.HollowProducer.runCycle(HollowProducer.java:390) [golftec-api-1.0-jar-with-dependencies.jar:na]
	at com.netflix.hollow.api.producer.HollowIncrementalProducer.runCycle(HollowIncrementalProducer.java:206) [golftec-api-1.0-jar-with-dependencies.jar:na]
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) ~[na:1.8.0_292]
	at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[na:1.8.0_292]
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) ~[na:1.8.0_292]
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) ~[na:1.8.0_292]
	at java.lang.Thread.run(Thread.java:748) ~[na:1.8.0_292]
Caused by: java.util.concurrent.ExecutionException: java.lang.NullPointerException
	at java.util.concurrent.FutureTask.report(FutureTask.java:122) ~[na:1.8.0_292]
	at java.util.concurrent.FutureTask.get(FutureTask.java:192) ~[na:1.8.0_292]
	at com.netflix.hollow.core.util.SimultaneousExecutor.awaitSuccessfulCompletion(SimultaneousExecutor.java:118) ~[golftec-api-1.0-jar-with-dependencies.jar:na]
	at com.netflix.hollow.api.producer.HollowIncrementalCyclePopulator.addRecords(HollowIncrementalCyclePopulator.java:142) ~[golftec-api-1.0-jar-with-dependencies.jar:na]
	... 10 common frames omitted
Caused by: java.lang.NullPointerException: null
	at com.netflix.hollow.core.write.objectmapper.HollowObjectTypeMapper.write(HollowObjectTypeMapper.java:170) ~[golftec-api-1.0-jar-with-dependencies.jar:na]
	at com.netflix.hollow.core.write.objectmapper.HollowMapTypeMapper.write(HollowMapTypeMapper.java:76) ~[golftec-api-1.0-jar-with-dependencies.jar:na]
	at com.netflix.hollow.core.write.objectmapper.HollowObjectTypeMapper$MappedField.copy(HollowObjectTypeMapper.java:470) ~[golftec-api-1.0-jar-with-dependencies.jar:na]
	at com.netflix.hollow.core.write.objectmapper.HollowObjectTypeMapper.write(HollowObjectTypeMapper.java:176) ~[golftec-api-1.0-jar-with-dependencies.jar:na]
	at com.netflix.hollow.core.write.objectmapper.HollowObjectMapper.add(HollowObjectMapper.java:70) ~[golftec-api-1.0-jar-with-dependencies.jar:na]
	at com.netflix.hollow.api.producer.WriteStateImpl.add(WriteStateImpl.java:41) ~[golftec-api-1.0-jar-with-dependencies.jar:na]
	at com.netflix.hollow.api.producer.HollowIncrementalCyclePopulator$2.run(HollowIncrementalCyclePopulator.java:136) ~[golftec-api-1.0-jar-with-dependencies.jar:na]
	... 5 common frames omitted

I got this error while writing the new state. Anyone can help me a guess on this to have more clue on investigate

Thanks!

[shaivadnai]

Were you using the v7.0.0 release when you got this NullPointerException?

[shaivadnai]

Can you share the input that produced this Exception?