No backing TransactionOperations configured during test execution

[Nahuel92]

Expected Behavior

Mocked repositories with methods annotated with @Transactional should work during testing. It doesn't matter if it is:

• @jakarta.transaction.Transactional
• @io.micronaut.transaction.annotation.Transactional

The bug manifests itself with both annotations.

Actual Behaviour

Mocked repositories with methods annotated with @Transactional fail during testing with o.micronaut.context.exceptions.ConfigurationException: No backing TransactionOperations configured. Check your configuration and try again.

Bug test cases

Annotation / Annotated on	Repository	Repository method	Tests execution result 1	Production execution result
@Transactional 2	Yes	No	Pass	Fail
@Transactional 2	No	Yes	Fail	Works well
@Transactional 2	Yes	Yes	Fail	Works well

Steps To Reproduce

For your convenience, you can use the provided app example. But here are the steps anyway:

1. Create an app with Micronaut Data JDBC + H2 driver (for instance).
2. Create a Repository (annotate it with @Repository).
3. Create a repository method and annotate it with @Transactional.
4. Create a Service (it may not be necessary, I haven't tested without a service class).
5. Inject the Repository and create a dummy service method calling the repository method.
6. Create a Service test (annotate it with @MicronautTest), mock the Repository with Mockito and inject it into the ApplicationContext with @MockBean(Repository.class) (to replace real Repository).
7. Execute the test and see it failing with io.micronaut.context.exceptions.ConfigurationException: No backing TransactionOperations configured. Check your configuration and try again.

If the @Transactional annotation is moved to a class level, the test will pass, but the Repository method will fail at runtime.

If the example app isn't clear enough, please let me know and I'll add more information. Thanks.

Environment Information

• Windows/ Linux (it doesn't really matter).
• JDK 21 (I don't think it matters).
• jUnit 5.
• Mockito.

Example Application

https://github.com/Nahuel92/Micronaut-test-bug

I added my findings to the README.md file.

Please set MICRONAUT_ENVIRONMENTS=prod before starting the app.

Version

4.4.2

Footnotes

1. Tests mock repositories with @MockBean(RepositoryClass.class). ↩

2. It doesn't matter whether it's @jakarta.transaction.Transactional
   or @io.micronaut.transaction.annotation.Transactional. ↩ ↩² ↩³

[Nahuel92]

Closing as per dstepanov's comment here:

micronaut-projects/micronaut-data#2943 (comment)

Opened a new improvement suggestion/discussion opener issue here.