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Add multi-datasource module: two databases with per-database DataSource, Flyway, EntityManagerFactory and transaction manager on Boot 4.1

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Working setup plus one small application per way of getting it wrong (no @Primary, @Primary only, url vs jdbc-url, wrong repository package, Flyway auto-configuration), plain vs named @Transactional, and ChainedTransactionManager with a failing commit. Transcripts are written by the tests.

Co-Authored-By: Claude Sonnet 5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01Uu7q8vPeREyT4218EJPzz1
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Claude
2026-09-24 09:38:27 +00:00
parent d6b76c57db
commit e59ff029a1
44 changed files with 1465 additions and 0 deletions
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multi-datasource/output/03-primary-only-wrong-database.txt
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# One @Primary DataSource and nothing else: it starts, and it writes to the wrong database
application started: yes
EntityManagerFactory beans: [entityManagerFactory]
customers database tables: [CUSTOMER, PURCHASE_ORDER]
orders database tables: []
rows in the customers database: customer=1 purchase_order=1
hibernate.hbm2ddl.auto on that factory: create-drop