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java.lang.NullPointerException: 	at org.springframework.batch.item.file.mapping.DefaultLineMapper.mapLine(DefaultLineMapper.java:21)	at org.springframework.batch.item.file.FlatFileItemReader.doRead(FlatFileItemReader.java:151)	at org.springframework.batch.item.support.AbstractItemCountingItemStreamItemReader.read(AbstractItemCountingItemStreamItemReader.java:61)	at org.springframework.batch.core.step.item.SimpleChunkProvider.doRead(SimpleChunkProvider.java:67)	at org.springframework.batch.core.step.item.SimpleChunkProvider.read(SimpleChunkProvider.java:111)