Spring Batch Reading AWS S3 -stepExecutionContext is null - spring-batch

Question

I am trying to read files from AWS s3 using spring batch but the file name becomes null in stepExecutionContext. Same code was working when i read the files from the windows mount but when we migrate the code and reading it from S3 it is becoming null.
#Bean
#JobScope
public CustomMultiResourcePartitioner partitioner() {
CustomMultiResourcePartitioner partitioner = new CustomMultiResourcePartitioner();
Set<String > filesToProcess= fileRepository.findAllFilesByFileState("NEW");
List<Resource> resourceList = new ArrayList<>();
for(String file:filesToProcess) {
Resource resource = getS3Resource(file);
resourceList.add(resource);
log.info("resourceList Size"+resourceList.size());
}
if(resourceList.size()>0 && resourceList.toArray()!=null) {
resources = resourceList.stream().toArray(Resource[]::new);
ExecutionContext executionContext = new ExecutionContext();
executionContext.put("FILE_NAME",filesToProcess);
}
else
{
resources = new Resource[0];
}
partitioner.setResources(resources);
return partitioner;
}
#Bean
#StepScope
public FlatFileItemReader<RosterInput> itemReader(#Value("#{stepExecutionContext[fileName]}") String filename) throws UnexpectedInputException, ParseException {
FlatFileItemReader<RosterInput> reader = new FlatFileItemReader<RosterInput>();
DelimitedLineTokenizer tokenizer = new DelimitedLineTokenizer();
tokenizer.setStrict(false);
Resource resource =getS3Resource(filename);
}

Answer 1

I was using ByteArrayResource in my getS3Resource() method it was causing the file name to null. After modifying the code to use below the problem is solved.
public class FileNameAwareByteArrayResource extends ByteArrayResource {
private String fileName;
public FileNameAwareByteArrayResource(String fileName, byte[] byteArray) {
super(byteArray);
this.fileName = fileName;
}
#Override
public String getFilename() {
return fileName;
}
}