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java.lang.NullPointerException: 	at org.springframework.batch.repeat.support.RepeatTemplate.executeInternal(RepeatTemplate.java:231)	at org.springframework.batch.repeat.support.RepeatTemplate.iterate(RepeatTemplate.java:143)	at org.springframework.batch.core.step.tasklet.TaskletStep.doExecute(TaskletStep.java:250)	at org.springframework.batch.core.step.AbstractStep.execute(AbstractStep.java:195)	at org.springframework.batch.core.job.SimpleStepHandler.handleStep(SimpleStepHandler.java:135)	at org.springframework.batch.core.job.flow.JobFlowExecutor.executeStep(JobFlowExecutor.java:61)	at org.springframework.batch.core.job.flow.support.state.StepState.handle(StepState.java:60)	at org.springframework.batch.core.job.flow.support.SimpleFlow.resume(SimpleFlow.java:144)	at org.springframework.batch.core.job.flow.support.SimpleFlow.start(SimpleFlow.java:124)	at org.springframework.batch.core.job.flow.FlowJob.doExecute(FlowJob.java:135)	at org.springframework.batch.core.job.AbstractJob.execute(AbstractJob.java:281)	at org.springframework.batch.core.launch.support.SimpleJobLauncher$1.run(SimpleJobLauncher.java:120)	at org.springframework.core.task.SyncTaskExecutor.execute(SyncTaskExecutor.java:48)	at org.springframework.batch.core.launch.support.SimpleJobLauncher.run(SimpleJobLauncher.java:114)	at org.springframework.batch.core.launch.support.CommandLineJobRunner.start(CommandLineJobRunner.java:349)	at org.springframework.batch.core.launch.support.CommandLineJobRunner.main(CommandLineJobRunner.java:574)