Different item writers?

The major difference between composite item writers and custom item writers in Spring Batch is that composite item writers are provided by the Spring Batch framework, while custom item writers are created by the user.

Composite item writers are pre-defined classes that are included in the Spring Batch framework, and they allow you to combine multiple item writers into a single step in your batch job. For example, you can use a composite item writer to write data to multiple tables in a database, or to write data to multiple files on disk.

Custom item writers, on the other hand, are classes that you create yourself to define the specific logic for writing data in your batch job. You can use custom item writers to implement custom logic for writing data to specific formats or destinations, or to integrate with external systems or libraries that are not supported by the built-in item writers in Spring Batch.

Overall, the major difference between composite item writers and custom item writers is that composite item writers are provided by the Spring Batch framework and are intended for general-purpose use, while custom item writers are user-defined classes that allow you to implement custom logic for writing data in your batch job.

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