Скачать или смотреть Solving the Hibernate does not save entity after transaction commit Issue in Spring Boot

Learn how to resolve the issue of Hibernate entities not being saved after a transaction commit in Spring Boot with this comprehensive guide.
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This video is based on the question https://stackoverflow.com/q/69597182/ asked by the user 'Sławek Filip' ( https://stackoverflow.com/u/13847544/ ) and on the answer https://stackoverflow.com/a/69598205/ provided by the user 'Sławek Filip' ( https://stackoverflow.com/u/13847544/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Introduction

When working with Spring Boot applications and using Hibernate for database interactions, developers might encounter a strange issue where entities are not saved to the database even after a transaction is committed. This problem can confuse many, particularly when everything seems to be configured correctly and the code executes without any exceptions. In this guide, we will explore the reasons behind such an issue and provide a detailed solution for it.

Understanding the Problem

Let’s consider a scenario where you have a service class designed to save a Person entity into the database. Despite executing the save operation, the entity is not recorded in the database. The immediate thought might be to blame the JPA repository or transactions management. Below is a simple version of the service code that leads to this confusion:

[[See Video to Reveal this Text or Code Snippet]]

Despite proper logging showing that the transaction starts and completes, the entity is still missing from the database state. This raises the question: what could possibly be going wrong?

Why isn’t the Entity Saved?

One of the main culprits for this issue can be the kind of transaction manager used in your Spring Boot configuration. In your case, it seems you have a configuration that uses DataSourceTransactionManager, which is typically suitable for JDBC operations but can cause problems with JPA.

Common Misconfiguration

The DatasourceTransactionManager does not manage JPA’s EntityManager, which is responsible for managing database interactions for entities. Therefore, when we execute database operations using JpaRepository methods, the expected commit does not occur as the required mechanisms to track and synchronize the entity states with the database are overlooked.

The Solution

To resolve this problem, the transaction manager must be appropriate for the JPA context. By replacing DataSourceTransactionManager with JpaTransactionManager, you can ensure that your transactions are managed in a way that is consistent with JPA.

Steps to Implement the Solution

Update your Transaction Manager: Modify your transaction manager from DataSourceTransactionManager to JpaTransactionManager in your configuration classes.

Example Configuration Change

For both primary and secondary data sources, make sure to use JpaTransactionManager as follows:

[[See Video to Reveal this Text or Code Snippet]]

Test the Configuration: Retest your application by calling the service method to save a Person entity. Log statements should now reflect that the transaction is correctly handled, and the entity should be visible in your database.

Conclusion

In summary, Hibernate entities failing to save despite committing the transaction is a common issue that can stem from incorrect transaction management settings. By utilizing JpaTransactionManager instead of DataSourceTransactionManager, you can ensure that JPA's EntityManager is properly integrated with transaction management in your application.

If you encounter similar issues in your own projects, you can now confidently adjust your transaction management strategy and resolve the problem effectively. Happy coding!