java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at io.github.mincongh.batch.LucenePartitionAnalyzer.analyzeCollectorData(LucenePartitionAnalyzer.java:40)
at org.jberet.runtime.runner.StepExecutionRunner.beginPartition(StepExecutionRunner.java:376)
at org.jberet.runtime.runner.StepExecutionRunner.runBatchletOrChunk(StepExecutionRunner.java:216)
at org.jberet.runtime.runner.StepExecutionRunner.run(StepExecutionRunner.java:140)
at org.jberet.runtime.runner.CompositeExecutionRunner.runStep(CompositeExecutionRunner.java:164)
at org.jberet.runtime.runner.CompositeExecutionRunner.runJobElement(CompositeExecutionRunner.java:128)
at org.jberet.runtime.runner.StepExecutionRunner.run(StepExecutionRunner.java:196)
at org.jberet.runtime.runner.CompositeExecutionRunner.runStep(CompositeExecutionRunner.java:164)
at org.jberet.runtime.runner.CompositeExecutionRunner.runJobElement(CompositeExecutionRunner.java:128)
at org.jberet.runtime.runner.CompositeExecutionRunner.runDecision(CompositeExecutionRunner.java:176)
at org.jberet.runtime.runner.CompositeExecutionRunner.runJobElement(CompositeExecutionRunner.java:134)
at org.jberet.runtime.runner.StepExecutionRunner.run(StepExecutionRunner.java:196)
at org.jberet.runtime.runner.CompositeExecutionRunner.runStep(CompositeExecutionRunner.java:164)
at org.jberet.runtime.runner.CompositeExecutionRunner.runJobElement(CompositeExecutionRunner.java:128)
at org.jberet.runtime.runner.CompositeExecutionRunner.runDecision(CompositeExecutionRunner.java:176)
at org.jberet.runtime.runner.CompositeExecutionRunner.runJobElement(CompositeExecutionRunner.java:134)
at org.jberet.runtime.runner.StepExecutionRunner.run(StepExecutionRunner.java:196)
at org.jberet.runtime.runner.CompositeExecutionRunner.runStep(CompositeExecutionRunner.java:164)
at org.jberet.runtime.runner.CompositeExecutionRunner.runFromHeadOrRestartPoint(CompositeExecutionRunner.java:88)
at org.jberet.runtime.runner.JobExecutionRunner.run(JobExecutionRunner.java:59)
at org.wildfly.extension.batch.jberet.impl.BatchEnvironmentService$WildFlyBatchEnvironment$1.run(BatchEnvironmentService.java:243)
at org.wildfly.extension.requestcontroller.RequestController$QueuedTask$1.run(RequestController.java:497)
at org.jberet.spi.JobExecutor$3.run(JobExecutor.java:161)
at org.jberet.spi.JobExecutor$1.run(JobExecutor.java:99)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
at org.jboss.threads.JBossThread.run(JBossThread.java:320)

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