创建FlatFileItemWriter bean时出错

调用批处理程序时,此行出现空指针异常:

String fileName = ((Map<String, MccFtpFile>) ec.get(AbstractSetupTasklet.BATCH_FTP_FILES)).get("scacFile").getLocalFile();

 // Writer
        @Bean(name = "clf010Writer")
        @StepScope
        public FlatFileItemWriter<Clf010Item> clfWriter(@Value("#{jobExecutionContext}") Map<Object, Object> ec, //
                @Qualifier("clf010LineAggregator") FormatterLineAggregator<Clf010Item> lineAgg) throws IOException {
            @SuppressWarnings("unchecked")
            String fileName = ((Map<String, MccFtpFile>) ec.get(AbstractSetupTasklet.BATCH_FTP_FILES)).get("scacFile").getLocalFile();
            //Ensure the file can exist.
            PrintWriter fos = getIoHarness().getFileOutputStream(fileName);
            fos.close();
            FlatFileItemWriter<Clf010Item> writer = new FlatFileItemWriter<>();
            writer.setResource(new FileSystemResource(fileName));
            writer.setLineAggregator(lineAgg);
            return writer;
        }

我好像想不出问题来。我猜是在找找找不到的文件?如果有人有什么见解或信息,我会非常感激。