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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
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multi-datasource/output/04-url-vs-jdbc-url.txt
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# DataSourceBuilder.create().build() bound to app.datasource.customers.url
startup failed: BeanCreationException -> BeanInstantiationException -> IllegalArgumentException
root cause: java.lang.IllegalArgumentException: dataSource or dataSourceClassName or jdbcUrl is required.