spring批处理执行，如何避免文件名为空的FlatFileItemWriter日志异常

Question

我正在使用spring批处理应用程序与读取器、写入器和处理器。文件名从batchjob传递到StepScope中的writer。当bean初始化时，我可以在BATCH_STEP_EXECUTION表中看到异常，如下org.springframework.beans.factory.BeanCreationException：创建类路径资源中定义的名为'scopedtarget.reswriter'的bean时出错：通过工厂方法实例化bean失败；嵌套异常为org.springframework.beans.beanInstantiationException：无法实例化[org.springframework.batch.item.file.FlatFileItemWriter]:工厂方法“res writer”引发异常；嵌套异常为java.lang.IllegalArgumentException：路径必须不为空

Spring批处理代码

    @StepScope
    @Bean
    public FlatFileItemWriter<EntityObject> regulatedEntityWriter(@Value("#{jobParameters['fileName']}") String fileName){
        
        /*
           while bean is initialized fileName is empty and FlatFileItemWriter requries filename, then it throws  Path must not be null exeption
        */
        pretaFileName = fileName;
        FlatFileItemWriter<EntityObject> csvFileWriter = new FlatFileItemWriter<>();
        
            String exportFileHeader = "column1,column2,column3";
            StringHeaderWriter headerWriter = new StringHeaderWriter(exportFileHeader);
            csvFileWriter.setHeaderCallback(headerWriter);
            csvFileWriter.setShouldDeleteIfEmpty(true);
            
            CustomDelimitedLineAggregator<EntityObject> lineAggregator = new CustomDelimitedLineAggregator<>();
            BeanWrapperFieldExtractor<EntityObject> fieldExtractor = new BeanWrapperFieldExtractor<>();
            fieldExtractor.setNames(new String[]{"column1", "column2", "column3"});
            lineAggregator.setFieldExtractor(fieldExtractor);
            csvFileWriter.setLineAggregator(lineAggregator);
            csvFileWriter.setEncoding(encodingType);
            csvFileWriter.setResource(new FileSystemResource(fileName));
        return csvFileWriter;
    }
    ```

 Above method is called using joblauncher

```  JobParameters params = new JobParametersBuilder()
                    .addString("JobID", String.valueOf(System.currentTimeMillis()))
                    .addString("fileName", "sample_file.txt")
                    .toJobParameters();
          
            JobExecution jobExecution =jobLauncher.run(job, params);

我试过@lazy注释，但当服务器启动时，它仍然会抛出这个异常。我使用的是多节点集群，当服务器在BATCH_STEP_EXECUTION表中启动时，它会为每个节点添加条目。当服务器第一次启动时，如何避免这个异常？

Answer 1

我在springboot application.properties中使用below属性默认禁用spring批处理，因为我正在触发并通过cron触发器传递参数。

spring.batch.job.enabled=false