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Claude e59ff029a1 Add multi-datasource module: two databases with per-database DataSource, Flyway, EntityManagerFactory and transaction manager on Boot 4.1
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
2026-09-24 09:38:27 +00:00

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# What does EntityManagerFactoryBuilder.Builder.packages(Class...) do with the classes it is given?
jar: spring-boot-jpa-4.1.1.jar
--- javap -c: the calls made inside packages(java.lang.Class<?>...) ---
invokespecial #34 // Method java/util/HashSet."<init>":()V
invokestatic #35 // Method org/springframework/util/ClassUtils.getPackageName:(Ljava/lang/Class;)Ljava/lang/String;
invokeinterface #41, 2 // InterfaceMethod java/util/Set.add:(Ljava/lang/Object;)Z
invokestatic #47 // Method org/springframework/util/StringUtils.toStringArray:(Ljava/util/Collection;)[Ljava/lang/String;