I am only a beginner in batch data processing and am currently studying Spring Batch. There is a point that I don’t quite understand yet. Why have so many different complex implementations of readers and writers been created, such as for files, databases, message brokers, but there is no simple way to transfer data between steps within the same application? Why is it necessary to complicate the application so much with its own implementation through context?

I am only a beginner in batch data processing and am currently studying Spring Batch. There is a point that I don’t quite understand yet. Why have so many different complex implementations of readers and writers been created, such as for files, databases, message brokers, but there is no simple way to transfer data between steps within the same application? Why is it necessary to complicate the application so much with its own implementation through context?