It looks like ItemReader as the methods open(), readItem(), close() so it knows about it’s lifecycle. The similar is the case for ItemWriter. However ItemProcessor and Batchlet look completely agnostic.

But then there are the interfaces JobListener, StepListener, ChunkListener. I implemented them and registered them via my batch xml file. But is it possible for e.g. MyItemProcessor to implement ChunkListener and StepListener and get notified about these lifecycle events?