Sharing object from LineCallbackHandler to ExecutionCOntext

Question

I have a csv file with one line on the top considered as the header. My reader configuration is as following :

FlatFileItemReader<EncCreditEntrepIndDTO> reader = new FlatFileItemReaderBuilder<EncCreditEntrepIndDTO>()
            .strict(false)
            .resource(resource)
            .linesToSkip(1)
            .skippedLinesCallback(headerHandler)
            .lineMapper(mapper)
            .saveState(false)
            .build();
    return reader;

This is my LineCallbackHandler :

public class HeaderHandler implements LineCallbackHandler {


@Override
public void handleLine(String line) {
    AtomicReference<StepHeader> headerLine = new AtomicReference<>();
    processLine(line, headerLine);

}

After processing the headerline, i want to save it in the execution context to use it later in some steps . I tried implementing StepListener and then StepExecutionListener and retrieve the actual context. It is always equals to null

Answer 1

I tried implementing StepListener and then StepExecutionListener and retrieve the actual context. It is always equals to null

Implementing StepExecutionListener should work if you register your callback handler as a listener in the step:

@Bean
public FlatFileItemReader<EncCreditEntrepIndDTO> itemReader(HeaderHandler headerHandler) {
    return new FlatFileItemReaderBuilder<EncCreditEntrepIndDTO>()
            // ...
            .skippedLinesCallback(headerHandler)
            .build();
}

@Bean
public Step step(StepBuilderFactory stepBuilderFactory, HeaderHandler headerHandler) {
    return stepBuilderFactory.get("step")
            .<EncCreditEntrepIndDTO, EncCreditEntrepIndDTO>chunk(5)
            .reader(itemReader(headerHandler))
            .writer(itemWriter())
            .listener(headerHandler)
            .build();
}