Jiang Xin created FLINK-30014:
---------------------------------

             Summary: Fix the NPE from aggregate util
                 Key: FLINK-30014
                 URL: https://issues.apache.org/jira/browse/FLINK-30014
             Project: Flink
          Issue Type: Bug
          Components: Library / Machine Learning
            Reporter: Jiang Xin
             Fix For: ml-2.2.0


The following exception is thrown in Flink ML CI step.

 

```
[INFO] Running org.apache.flink.ml.feature.CountVectorizerTest 
[435|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:436]Error:
  Tests run: 12, Failures: 0, Errors: 1, Skipped: 0, Time elapsed: 6.419 s <<< 
FAILURE! - in org.apache.flink.ml.feature.CountVectorizerTest 
[436|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:437]Error:
  testFitAndPredict Time elapsed: 0.66 s <<< ERROR! 
[437|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:438]java.lang.RuntimeException:
 Failed to fetch next result 
[438|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:439]
 at 
org.apache.flink.streaming.api.operators.collect.CollectResultIterator.nextResultFromFetcher(CollectResultIterator.java:109)
 
[439|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:440]
 at 
org.apache.flink.streaming.api.operators.collect.CollectResultIterator.hasNext(CollectResultIterator.java:80)
 
[440|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:441]
 at org.apache.commons.collections.IteratorUtils.toList(IteratorUtils.java:848) 
[441|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:442]
 at org.apache.commons.collections.IteratorUtils.toList(IteratorUtils.java:825) 
[442|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:443]
 at 
org.apache.flink.ml.feature.CountVectorizerTest.verifyPredictionResult(CountVectorizerTest.java:120)
 
[443|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:444]
 at 
org.apache.flink.ml.feature.CountVectorizerTest.testFitAndPredict(CountVectorizerTest.java:208)
 
[444|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:445]
 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
[445|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:446]
 at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) 
[446|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:447]
 at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
 
[447|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:448]
 at java.lang.reflect.Method.invoke(Method.java:498) 
[448|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:449]
 at 
org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:59)
 
[449|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:450]
 at 
org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
 
[450|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:451]
 at 
org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:56)
 
[451|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:452]
 at 
org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
 
[452|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:453]
 at 
org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26) 
[453|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:454]
 at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:27) 
[454|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:455]
 at org.junit.rules.ExternalResource$1.evaluate(ExternalResource.java:54) 
[455|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:456]
 at org.apache.flink.util.TestNameProvider$1.evaluate(TestNameProvider.java:45) 
[456|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:457]
 at org.junit.rules.TestWatcher$1.evaluate(TestWatcher.java:61) 
[457|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:458]
 at org.junit.runners.ParentRunner$3.evaluate(ParentRunner.java:306) 
[458|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:459]
 at 
org.junit.runners.BlockJUnit4ClassRunner$1.evaluate(BlockJUnit4ClassRunner.java:100)
 
[459|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:460]
 at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:366) 
[460|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:461]
 at 
org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:103)
 
[461|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:462]
 at 
org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:63)
 
[462|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:463]
 at org.junit.runners.ParentRunner$4.run(ParentRunner.java:331) 
[463|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:464]
 at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:79) 
[464|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:465]
 at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:329) 
[465|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:466]
 at org.junit.runners.ParentRunner.access$100(ParentRunner.java:66) 
[466|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:467]
 at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:293) 
[467|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:468]
 at org.junit.rules.ExternalResource$1.evaluate(ExternalResource.java:54) 
[468|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:469]
 at org.junit.rules.ExternalResource$1.evaluate(ExternalResource.java:54) 
[469|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:470]
 at org.junit.rules.RunRules.evaluate(RunRules.java:20) 
[470|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:471]
 at org.junit.runners.ParentRunner$3.evaluate(ParentRunner.java:306) 
[471|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:472]
 at org.junit.runners.ParentRunner.run(ParentRunner.java:413) 
[472|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:473]
 at org.junit.runner.JUnitCore.run(JUnitCore.java:137) 
[473|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:474]
 at org.junit.runner.JUnitCore.run(JUnitCore.java:115) 
[474|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:475]
 at 
org.junit.vintage.engine.execution.RunnerExecutor.execute(RunnerExecutor.java:42)
 
[475|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:476]
 at 
org.junit.vintage.engine.VintageTestEngine.executeAllChildren(VintageTestEngine.java:80)
 
[476|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:477]
 at 
org.junit.vintage.engine.VintageTestEngine.execute(VintageTestEngine.java:72) 
[477|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:478]
 at 
org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:220)
 
[478|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:479]
 at 
org.junit.platform.launcher.core.DefaultLauncher.lambda$execute$6(DefaultLauncher.java:188)
 
[479|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:480]
 at 
org.junit.platform.launcher.core.DefaultLauncher.withInterceptedStreams(DefaultLauncher.java:202)
 
[480|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:481]
 at 
org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:181)
 
[481|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:482]
 at 
org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:128)
 
[482|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:483]
 at 
org.apache.maven.surefire.junitplatform.JUnitPlatformProvider.invokeAllTests(JUnitPlatformProvider.java:142)
 
[483|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:484]
 at 
org.apache.maven.surefire.junitplatform.JUnitPlatformProvider.invoke(JUnitPlatformProvider.java:109)
 
[484|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:485]
 at 
org.apache.maven.surefire.booter.ForkedBooter.invokeProviderInSameClassLoader(ForkedBooter.java:384)
 
[485|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:486]
 at 
org.apache.maven.surefire.booter.ForkedBooter.runSuitesInProcess(ForkedBooter.java:345)
 
[486|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:487]
 at 
org.apache.maven.surefire.booter.ForkedBooter.execute(ForkedBooter.java:126) 
[487|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:488]
 at org.apache.maven.surefire.booter.ForkedBooter.main(ForkedBooter.java:418) 
[488|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:489]Caused
 by: java.io.IOException: Failed to fetch job execution result 
[489|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:490]
 at 
org.apache.flink.streaming.api.operators.collect.CollectResultFetcher.getAccumulatorResults(CollectResultFetcher.java:184)
 
[490|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:491]
 at 
org.apache.flink.streaming.api.operators.collect.CollectResultFetcher.next(CollectResultFetcher.java:121)
 
[491|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:492]
 at 
org.apache.flink.streaming.api.operators.collect.CollectResultIterator.nextResultFromFetcher(CollectResultIterator.java:106)
 
[492|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:493]
 ... 49 more 
[493|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:494]Caused
 by: java.util.concurrent.ExecutionException: 
org.apache.flink.runtime.client.JobExecutionException: Job execution failed. 
[494|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:495]
 at 
java.util.concurrent.CompletableFuture.reportGet(CompletableFuture.java:357) 
[495|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:496]
 at java.util.concurrent.CompletableFuture.get(CompletableFuture.java:1928) 
[496|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:497]
 at 
org.apache.flink.streaming.api.operators.collect.CollectResultFetcher.getAccumulatorResults(CollectResultFetcher.java:182)
 
[497|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:498]
 ... 51 more 
[498|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:499]Caused
 by: org.apache.flink.runtime.client.JobExecutionException: Job execution 
failed. 
[499|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:500]
 at 
org.apache.flink.runtime.jobmaster.JobResult.toJobExecutionResult(JobResult.java:144)
 
[500|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:501]
 at 
org.apache.flink.runtime.minicluster.MiniClusterJobClient.lambda$getJobExecutionResult$3(MiniClusterJobClient.java:141)
 
[501|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:502]
 at java.util.concurrent.CompletableFuture.uniApply(CompletableFuture.java:616) 
[502|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:503]
 at 
java.util.concurrent.CompletableFuture.uniApplyStage(CompletableFuture.java:628)
 
[503|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:504]
 at 
java.util.concurrent.CompletableFuture.thenApply(CompletableFuture.java:1996) 
[504|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:505]
 at 
org.apache.flink.runtime.minicluster.MiniClusterJobClient.getJobExecutionResult(MiniClusterJobClient.java:138)
 
[505|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:506]
 at 
org.apache.flink.streaming.api.operators.collect.CollectResultFetcher.getAccumulatorResults(CollectResultFetcher.java:181)
 
[506|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:507]
 ... 51 more 
[507|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:508]Caused
 by: org.apache.flink.runtime.JobException: Recovery is suppressed by 
NoRestartBackoffTimeStrategy 
[508|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:509]
 at 
org.apache.flink.runtime.executiongraph.failover.flip1.ExecutionFailureHandler.handleFailure(ExecutionFailureHandler.java:138)
 
[509|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:510]
 at 
org.apache.flink.runtime.executiongraph.failover.flip1.ExecutionFailureHandler.getFailureHandlingResult(ExecutionFailureHandler.java:82)
 
[510|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:511]
 at 
org.apache.flink.runtime.scheduler.DefaultScheduler.handleTaskFailure(DefaultScheduler.java:301)
 
[511|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:512]
 at 
org.apache.flink.runtime.scheduler.DefaultScheduler.maybeHandleTaskFailure(DefaultScheduler.java:291)
 
[512|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:513]
 at 
org.apache.flink.runtime.scheduler.DefaultScheduler.updateTaskExecutionStateInternal(DefaultScheduler.java:282)
 
[513|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:514]
 at 
org.apache.flink.runtime.scheduler.SchedulerBase.updateTaskExecutionState(SchedulerBase.java:739)
 
[514|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:515]
 at 
org.apache.flink.runtime.scheduler.SchedulerNG.updateTaskExecutionState(SchedulerNG.java:78)
 
[515|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:516]
 at 
org.apache.flink.runtime.jobmaster.JobMaster.updateTaskExecutionState(JobMaster.java:443)
 
[516|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:517]
 at sun.reflect.GeneratedMethodAccessor20.invoke(Unknown Source) 
[517|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:518]
 at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
 
[518|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:519]
 at java.lang.reflect.Method.invoke(Method.java:498) 
[519|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:520]
 at 
org.apache.flink.runtime.rpc.akka.AkkaRpcActor.lambda$handleRpcInvocation$1(AkkaRpcActor.java:304)
 
[520|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:521]
 at 
org.apache.flink.runtime.concurrent.akka.ClassLoadingUtils.runWithContextClassLoader(ClassLoadingUtils.java:83)
 
[521|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:522]
 at 
org.apache.flink.runtime.rpc.akka.AkkaRpcActor.handleRpcInvocation(AkkaRpcActor.java:302)
 
[522|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:523]
 at 
org.apache.flink.runtime.rpc.akka.AkkaRpcActor.handleRpcMessage(AkkaRpcActor.java:217)
 
[523|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:524]
 at 
org.apache.flink.runtime.rpc.akka.FencedAkkaRpcActor.handleRpcMessage(FencedAkkaRpcActor.java:78)
 
[524|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:525]
 at 
org.apache.flink.runtime.rpc.akka.AkkaRpcActor.handleMessage(AkkaRpcActor.java:163)
 
[525|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:526]
 at akka.japi.pf.UnitCaseStatement.apply(CaseStatements.scala:24) 
[526|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:527]
 at akka.japi.pf.UnitCaseStatement.apply(CaseStatements.scala:20) 
[527|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:528]
 at scala.PartialFunction.applyOrElse(PartialFunction.scala:123) 
[528|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:529]
 at scala.PartialFunction.applyOrElse$(PartialFunction.scala:122) 
[529|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:530]
 at akka.japi.pf.UnitCaseStatement.applyOrElse(CaseStatements.scala:20) 
[530|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:531]
 at scala.PartialFunction$OrElse.applyOrElse(PartialFunction.scala:171) 
[531|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:532]
 at scala.PartialFunction$OrElse.applyOrElse(PartialFunction.scala:172) 
[532|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:533]
 at scala.PartialFunction$OrElse.applyOrElse(PartialFunction.scala:172) 
[533|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:534]
 at akka.actor.Actor.aroundReceive(Actor.scala:537) 
[534|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:535]
 at akka.actor.Actor.aroundReceive$(Actor.scala:535) 
[535|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:536]
 at akka.actor.AbstractActor.aroundReceive(AbstractActor.scala:220) 
[536|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:537]
 at akka.actor.ActorCell.receiveMessage(ActorCell.scala:580) 
[537|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:538]
 at akka.actor.ActorCell.invoke(ActorCell.scala:548) 
[538|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:539]
 at akka.dispatch.Mailbox.processMailbox(Mailbox.scala:270) 
[539|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:540]
 at akka.dispatch.Mailbox.run(Mailbox.scala:231) 
[540|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:541]
 at akka.dispatch.Mailbox.exec(Mailbox.scala:243) 
[541|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:542]
 at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:289) 
[542|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:543]
 at java.util.concurrent.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1056) 
[543|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:544]
 at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1692) 
[544|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:545]
 at 
java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:175) 
[545|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:546]Caused
 by: java.io.IOException: Could not perform checkpoint 1 for operator aggregate 
-> *anonymous_datastream_source$658*[743] -> TableToDataSteam (1/1)#0. 
[546|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:547]
 at 
org.apache.flink.streaming.runtime.tasks.StreamTask.triggerCheckpointOnBarrier(StreamTask.java:1210)
 
[547|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:548]
 at 
org.apache.flink.streaming.runtime.io.checkpointing.CheckpointBarrierHandler.notifyCheckpoint(CheckpointBarrierHandler.java:147)
 
[548|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:549]
 at 
org.apache.flink.streaming.runtime.io.checkpointing.SingleCheckpointBarrierHandler.triggerCheckpoint(SingleCheckpointBarrierHandler.java:287)
 
[549|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:550]
 at 
org.apache.flink.streaming.runtime.io.checkpointing.SingleCheckpointBarrierHandler.access$100(SingleCheckpointBarrierHandler.java:64)
 
[550|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:551]
 at 
org.apache.flink.streaming.runtime.io.checkpointing.SingleCheckpointBarrierHandler$ControllerImpl.triggerGlobalCheckpoint(SingleCheckpointBarrierHandler.java:493)
 
[551|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:552]
 at 
org.apache.flink.streaming.runtime.io.checkpointing.AbstractAlignedBarrierHandlerState.triggerGlobalCheckpoint(AbstractAlignedBarrierHandlerState.java:74)
 
[552|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:553]
 at 
org.apache.flink.streaming.runtime.io.checkpointing.AbstractAlignedBarrierHandlerState.barrierReceived(AbstractAlignedBarrierHandlerState.java:66)
 
[553|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:554]
 at 
org.apache.flink.streaming.runtime.io.checkpointing.SingleCheckpointBarrierHandler.lambda$processBarrier$2(SingleCheckpointBarrierHandler.java:234)
 
[554|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:555]
 at 
org.apache.flink.streaming.runtime.io.checkpointing.SingleCheckpointBarrierHandler.markCheckpointAlignedAndTransformState(SingleCheckpointBarrierHandler.java:262)
 
[555|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:556]
 at 
org.apache.flink.streaming.runtime.io.checkpointing.SingleCheckpointBarrierHandler.processBarrier(SingleCheckpointBarrierHandler.java:231)
 
[556|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:557]
 at 
org.apache.flink.streaming.runtime.io.checkpointing.CheckpointedInputGate.handleEvent(CheckpointedInputGate.java:181)
 
[557|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:558]
 at 
org.apache.flink.streaming.runtime.io.checkpointing.CheckpointedInputGate.pollNext(CheckpointedInputGate.java:159)
 
[558|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:559]
 at 
org.apache.flink.streaming.runtime.io.AbstractStreamTaskNetworkInput.emitNext(AbstractStreamTaskNetworkInput.java:110)
 
[559|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:560]
 at 
org.apache.flink.streaming.runtime.io.StreamOneInputProcessor.processInput(StreamOneInputProcessor.java:65)
 
[560|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:561]
 at 
org.apache.flink.streaming.runtime.tasks.StreamTask.processInput(StreamTask.java:519)
 
[561|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:562]
 at 
org.apache.flink.streaming.runtime.tasks.mailbox.MailboxProcessor.runMailboxLoop(MailboxProcessor.java:203)
 
[562|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:563]
 at 
org.apache.flink.streaming.runtime.tasks.StreamTask.runMailboxLoop(StreamTask.java:804)
 
[563|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:564]
 at 
org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:753) 
[564|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:565]
 at 
org.apache.flink.runtime.taskmanager.Task.runWithSystemExitMonitoring(Task.java:948)
 
[565|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:566]
 at org.apache.flink.runtime.taskmanager.Task.restoreAndInvoke(Task.java:927) 
[566|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:567]
 at org.apache.flink.runtime.taskmanager.Task.doRun(Task.java:741) 
[567|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:568]
 at org.apache.flink.runtime.taskmanager.Task.run(Task.java:563) 
[568|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:569]
 at java.lang.Thread.run(Thread.java:750) 
[569|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:570]Caused
 by: org.apache.flink.runtime.checkpoint.CheckpointException: Could not 
complete snapshot 1 for operator aggregate -> 
*anonymous_datastream_source$658*[743] -> TableToDataSteam (1/1)#0. Failure 
reason: Checkpoint was declined. 
[570|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:571]
 at 
org.apache.flink.streaming.api.operators.StreamOperatorStateHandler.snapshotState(StreamOperatorStateHandler.java:269)
 
[571|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:572]
 at 
org.apache.flink.streaming.api.operators.StreamOperatorStateHandler.snapshotState(StreamOperatorStateHandler.java:173)
 
[572|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:573]
 at 
org.apache.flink.streaming.api.operators.AbstractStreamOperator.snapshotState(AbstractStreamOperator.java:348)
 
[573|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:574]
 at 
org.apache.flink.streaming.runtime.tasks.RegularOperatorChain.checkpointStreamOperator(RegularOperatorChain.java:227)
 
[574|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:575]
 at 
org.apache.flink.streaming.runtime.tasks.RegularOperatorChain.buildOperatorSnapshotFutures(RegularOperatorChain.java:212)
 
[575|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:576]
 at 
org.apache.flink.streaming.runtime.tasks.RegularOperatorChain.snapshotState(RegularOperatorChain.java:192)
 
[576|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:577]
 at 
org.apache.flink.streaming.runtime.tasks.SubtaskCheckpointCoordinatorImpl.takeSnapshotSync(SubtaskCheckpointCoordinatorImpl.java:647)
 
[577|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:578]
 at 
org.apache.flink.streaming.runtime.tasks.SubtaskCheckpointCoordinatorImpl.checkpointState(SubtaskCheckpointCoordinatorImpl.java:320)
 
[578|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:579]
 at 
org.apache.flink.streaming.runtime.tasks.StreamTask.lambda$performCheckpoint$12(StreamTask.java:1253)
 
[579|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:580]
 at 
org.apache.flink.streaming.runtime.tasks.StreamTaskActionExecutor$1.runThrowing(StreamTaskActionExecutor.java:50)
 
[580|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:581]
 at 
org.apache.flink.streaming.runtime.tasks.StreamTask.performCheckpoint(StreamTask.java:1241)
 
[581|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:582]
 at 
org.apache.flink.streaming.runtime.tasks.StreamTask.triggerCheckpointOnBarrier(StreamTask.java:1198)
 
[582|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:583]
 ... 22 more 
[583|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:584]Caused
 by: java.lang.NullPointerException: You cannot add null to a ListState. 
[584|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:585]
 at org.apache.flink.util.Preconditions.checkNotNull(Preconditions.java:76) 
[585|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:586]
 at 
org.apache.flink.runtime.state.PartitionableListState.add(PartitionableListState.java:94)
 
[586|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:587]
 at 
org.apache.flink.ml.common.datastream.DataStreamUtils$AggregateOperator.snapshotState(DataStreamUtils.java:463)
 
[587|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:588]
 at 
org.apache.flink.streaming.api.operators.StreamOperatorStateHandler.snapshotState(StreamOperatorStateHandler.java:222)
 
[588|https://github.com/apache/flink-ml/actions/runs/3459311341/jobs/5774576369#step:4:589]
 ... 33 more
```



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