Скачать или смотреть Solving the @ Transactional Issue in Spring Boot 3 with Hibernate 6

Discover how to correctly manage transactions in Spring Boot 3 and Hibernate 6 using the `@ Transactional` annotation. This guide provides step-by-step instructions to resolve common pitfalls.
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Solving the @ Transactional Issue in Spring Boot 3 with Hibernate 6

When migrating to Spring Boot 3 and Hibernate 6, many developers encounter unexpected issues with transaction management, particularly regarding the @ Transactional annotation. In this article, we'll explore a specific case where transactions fail to start correctly and provide a clear, step-by-step solution to fix the problem.

The Problem

After transitioning to Spring Boot 3 and Hibernate 6, a developer reported an issue when attempting to use the @ Transactional annotation. The expected behavior is that when the test() method is invoked, a new transaction should start, allowing for operations on the database. However, an error indicates that there is no active transaction:

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Relevant Code Snippet

Here's the original code snippet that led to the issue:

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The developer also shared their configuration, which appears to have an issue with session management.

Configuration Insights

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And in the application.properties:

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Diagnosing the Issue

Common Traps

Incorrect EntityManager Injection:

The use of EntityManagerFactory can lead to complications with transaction management.

Session Context Configuration:

The line spring.jpa.properties.hibernate.current_session_context_class=thread can cause issues if not set properly for transaction boundaries.

Session Unwrapping:

Unwrapping the session before properly ensuring that it has an active transaction can yield errors.

The Solution

After diagnosing the problem, the solution involves modifying the way the EntityManager is injected and accessed.

Step-by-Step Fix

Change EntityManager Injection:
Instead of using EntityManagerFactory, switch to injecting the EntityManager directly like this:

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Unwrap the Session Properly:
When you need to access the Session, ensure that you unwrap it from the correct context:

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Updated Code Example

Here is the revised version of the original code utilizing the solution provided:

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Conclusion

By following the steps outlined in this post, developers can effectively address the challenge of transaction management in Spring Boot 3 and Hibernate 6. It's essential to ensure that the correct EntityManager is in use and that transactions are appropriately handled. This will not only prevent errors such as “calling method 'createQuery' is not valid without an active transaction” but will also create a smoother development experience.

If you are migrating to Spring Boot 3 and facing similar issues, applying this fix can save you time and ensure that your applications run smoothly with consistent transaction behavior.