Inconsistent state validation rules between RepositoryItemReader and RepositoryItemReaderBuilder

[ghusta]

Bug description
Depending on whether you create an instance of RepositoryItemReader via :

• bean factory using RepositoryItemReader's afterPropertiesSet()
• or RepositoryItemReaderBuilder

The validation won't be the same in the case of we set these 3 parameters : repository + methodName + sorts

• if we make an instance via RepositoryItemReader, calling afterPropertiesSet() at the send, it's 🆗
• if we make an instance via RepositoryItemReaderBuilder, it's ❌ with this exception : java.lang.IllegalStateException: A name is required when saveState is set to true.

Environment
Spring Batch 4.3 / 5.0

Minimal Complete Reproducible example
Failing unit test : org.example.ReaderInitializerTest#init_reader_via_builder,
that can be found in this project : https://github.com/ghusta/test-spring-batch-repository-item-reader-builder