👀 Views: 57 💬 Answers: 1 📅 Created: 2025-06-28

spring-boot transaction-management jpa Java

I'm currently working on a Spring Boot application that connects to two different databases. Both databases have their own data sources defined in the application properties. However, I'm facing a transaction management issue where transactions are not being properly committed across both databases, leading to inconsistent data states. I've defined two `DataSource` beans in my configuration class like this: ```java @Bean @Primary public DataSource primaryDataSource() { return DataSourceBuilder.create() .url("jdbc:mysql://localhost:3306/primary_db") .username("user1") .password("pass1") .build(); } @Bean public DataSource secondaryDataSource() { return DataSourceBuilder.create() .url("jdbc:mysql://localhost:3306/secondary_db") .username("user2") .password("pass2") .build(); } ``` I also have the following transaction manager configuration: ```java @Bean public PlatformTransactionManager transactionManager(EntityManagerFactory emf) { return new JpaTransactionManager(emf); } ``` However, when I try to save entities using repositories for both databases within the same service method, I receive an `org.springframework.transaction.TransactionSystemException: Could not commit JPA transaction; nested exception is javax.persistence.RollbackException: Error while committing the transaction` error. I've tried using `@Transactional` at the service method level, but it seems to only apply to the primary database. I've also considered using `@Transactional(transactionManager = "primaryTransactionManager")` and `@Transactional(transactionManager = "secondaryTransactionManager")`, but that just leads to confusion and I'm not sure how to make them work together. I'm looking for guidance on how to properly manage transactions across these two data sources within a single service method. Any suggestions on best practices for achieving this would be greatly appreciated! This is for a REST API running on Linux. What am I doing wrong?