Question

I’m reading a csv file with FlatFileItemReader and using a FieldSetMapper to map it to a domain object.

In case the mapping fails, I would like to have the original line read by the FlatFileItemReader at my disposal so I could write it to another csv file.

My original idea was to use some listener to push the read string to StepContext and then a SkipListener to fetch the string to write it to another file. But I can’t find a way to catch the original line read by the FlatFileItemReader.

Suggestions?

Answer 1

if your configuration is similar to the Spring Batch Documentation for FlatFileItemReader, you could use a custom LineMapper instead of the usual DefaultLineMapper which throws an enriched exception

here is some simple example code

public class DefaultLineMapper<T> implements LineMapper<T>, InitializingBean {
    (...)

public T mapLine(String line, int lineNumber) throws Exception {
            try {
      return fieldSetMapper.mapFieldSet(tokenizer.tokenize(line));
            }
            catch (...) {
                throw new CustomException(line, lineNumber);
            }
}

}