spring batch execution, how to avoid if file name is empty with FlatFileItemWriter from logging exception

Question

I am using spring batch applicationwith reader,writer and processor. File name is passed from batchjob to writer which is in stepscope.When bean is initialized I could see exception in BATCH_STEP_EXECUTION table as below org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'scopedTarget.resWriter' defined in class path resource : Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.batch.item.file.FlatFileItemWriter]: Factory method 'resWriter' threw exception; nested exception is java.lang.IllegalArgumentException: Path must not be null

Spring batch code

    @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);

I have tried @Lazy annotation, still when server is coming up it throws that exception. I am using multi node cluster and it add entries for each node while server is coming up in BATCH_STEP_EXECUTION table.How to avoid this exception while server startup for the first time?

How do you restart job after getting file name? If it's started by cron you can skip run with empty file name — rell
Cron expression is used to run a job and this is configured to run once a day, But writer bean is initialized while server startup and throws java.lang.IllegalArgumentException: Path must not be null.Is there any way to skip this exception logging to BATCH_STEP_EXECUTION and this happens every time when server is starting. — VG P
It's looks similar to your problem stackoverflow.com/questions/27064832/… — rell
I see nothing wrong with your item writer's definition and how you pass the fileName job parameter. What is this resWriter method in Factory method 'resWriter' threw exception ? Where is this method defined? Can you share its code? — Mahmoud Ben Hassine

VG P VG P · Accepted Answer · 2020-07-18T18:07:01

I have used below property in springboot application.properties to disable spring batch by default as I am triggering and passing parameter through cron trigger.

spring.batch.job.enabled=false

spring batch execution, how to avoid if file name is empty with FlatFileItemWriter from logging exception

1 Answers