Why does Hibernate only Auto-Flush inside a transaction?

Because the docummentation for FlushMode says.

Because the docummentation for FlushMode says The Session is sometimes flushed before query execution in order to ensure that queries never return stale state. This is the default flush mode. So, auto doesn't mean what you think it means.

The name is, arguably, badly chosen, but it doesn't mean a flush is made after each session operation. It's thus not similar to JDBC's autocommit, which makes a commit after ever JDBC statement.

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