How to retry Spring Batch FlatFileItemReader? - spring-batch

Question

i'm triyng to retry spring batch FlatFileItemReader but no success.
FlatFileItemReader<Transaction> reader = new FlatFileItemReader<>();
Resource resource = new FileSystemResource("input/1-101-D-2017-212-volume-per-transaction.csv");
try {
resource.contentLength();
} catch (IOException e) {
e.printStackTrace();
}
reader.setResource(resource);
reader.setRecordSeparatorPolicy(new BlankLineRecordSeparatorPolicy());
DefaultLineMapper<Transaction> lineMapper = new DefaultLineMapper<>();
reader.setLineMapper(lineMapper);
reader.setStrict(false);
reader.setLinesToSkip(NUMBER_OF_HEADER_LINES);
DelimitedLineTokenizer tokenizer = new DelimitedLineTokenizer();
reader.setSkippedLinesCallback(line -> tokenizer.setNames(line.split(",")));
lineMapper.setLineTokenizer(tokenizer);
lineMapper.setFieldSetMapper(new TransactionFieldSetMapper());
reader.setLineMapper(lineMapper);
return reader;
then into my step i have
.faultTolerant()
.retryLimit(3)
.retry(FileNotFoundException.class)
can someone give my some hint how can retry it?

Answer 1

Hopefully it's still useful for you, please refer to this example where I put an example of the retry reader using FlatFileItemReader:
https://github.com/jeronimogalicia/batch-retry-flatfile-item-reader
Basically you have to annotate your application class with #EnableRetry and annotate your reader like this:
#Bean
#StepScope
#Retryable(include = { ItemStreamException.class }, maxAttempts = 5)
ItemReader<Player> loadRecordsReader() throws Exception {
String filePath = "src/main/resources/players.csv";
System.out.println("Loading records from " + filePath + " try " + counter);
FlatFileItemReader<Player> itemReader = new FlatFileItemReader<>();
itemReader.setResource(new FileSystemResource(filePath));
itemReader.setLinesToSkip(1);
//DelimitedLineTokenizer defaults to comma as its delimiter
DefaultLineMapper<Player> lineMapper = new DefaultLineMapper<>();
lineMapper.setLineTokenizer(new DelimitedLineTokenizer());
lineMapper.setFieldSetMapper(new PlayerFieldSetMapper());
itemReader.setLineMapper(lineMapper);
itemReader.open(new ExecutionContext());
return itemReader;
}