Spring batch write skipper item into csv file - spring-batch

Question

I want to write skipper lines in first csv file and the result of processor in second file in one step but it not works !
My code :
// => Step cecStep1
#Bean
public Step cecStep1(StepBuilderFactory stepBuilders) throws IOException {
return stepBuilders.get("fileDecrypt")
.<CSCivique, String>chunk(100)
.reader(reader1())
.processor(processor1FileDecrypt())
.writer(writer1())
.faultTolerant()
.skip(Exception.class)
.skipLimit(100)
.listener(new MySkipListener())
.build();
}
// ##################################### Step SkipListener ###################################################
public static class MySkipListener implements SkipListener {
private BufferedWriter bw = null;
public MySkipListener(File file) throws IOException {
//this.fileWriter = new FileWriter(file);
bw= new BufferedWriter(new FileWriter(file, true));
System.out.println("MySkipListener =========> :"+file);
}
#Override
public void onSkipInRead(Throwable throwable) {
if (throwable instanceof FlatFileParseException) {
FlatFileParseException flatFileParseException = (FlatFileParseException) throwable;
System.out.println("onSkipInRead =========> :");
try {
bw.write(flatFileParseException.getInput()+"; Vérifiez les colonnes !!");
bw.newLine();
bw.flush();
// fileWriter.close();
} catch (IOException e) {
System.err.println("Unable to write skipped line to error file");
}
}
}
#Override
public void onSkipInWrite(CSCivique item, Throwable t) {
System.out.println("Item " + item + " was skipped due to: " + t.getMessage());
}
#Override
public void onSkipInProcess(CSCivique item, Throwable t) {
System.out.println("Item " + item + " was skipped due to: " + t.getMessage());
}
}
#Bean
public FlatFileItemWriter<String> writer1() {
return new FlatFileItemWriterBuilder<String>().name(greetingItemWriter)
.resource(new FileSystemResource("target/test-outputs/greetings.csv"))
.lineAggregator(new PassThroughLineAggregator<>()).build();
}
Tankyou !

Answer 1

In your processor, you can:
throw a skippable exception for invalid items so that the skip listener intercepts them and writes them to the specified file
let valid items go to the writer so that they are written as configured in the item writer
For example:
class MyItemProcessor implements ItemProcessor<Object, Object> {
#Override
public Object process(Object item) throws Exception {
if (shouldBeSkipped(item)) {
throw new MySkippableException();
}
// process item
return item;
}
}
Hope this helps.