What should I do if the Spring Boot configuration for switching between multiple data sources is not working?

If multiple data sources in Spring Boot configuration are not switching effectively, you can follow the steps below to troubleshoot and solve the issue:

1. Make sure to correctly configure the connection information for multiple data sources in the application.properties or application.yml file, including the URL, username, and password of the data sources.
2. Ensure that the @Configuration and @EnableTransactionManagement annotations are used in the configuration class to enable transaction management.
3. Ensure that the DataSource objects for multiple data sources are correctly configured in the configuration class and register them as beans with the @Bean annotation in the Spring container.
4. Make sure that the main DataSource object for the primary data source is marked with the @Primary annotation in the configuration class.
5. Make sure to specify the data source to be used by using the @Qualifier annotation in places where different data sources are required.
6. If all the above steps are configured correctly, but the switch of the data source is still not taking effect, it may be because the transaction manager is not configured correctly. You can try configuring multiple transaction managers in the configuration class, each corresponding to a different data source, and use the @Transactional(“transactionManagerName”) annotation to specify the transaction manager to use in places where different data sources are needed.
7. If the issue still cannot be resolved, you can try using the @Primary annotation in the configuration class to mark the transaction manager of the primary data source.
8. If the above steps do not solve the issue, it may be due to Spring Boot version incompatibility or other abnormal situations. You can try upgrading or downgrading the Spring Boot version, or check the log files and other specific error information for further troubleshooting.