Spring Framework 6.2.0-RC2 no longer creates a spy for `@MockitoSpyBean`

[JKatzwinkel]

Upgrading from Spring Boot 3.4.0-M3 (Spring Framework 6.2.0-RC1) to Spring Boot 3.4.0-RC1 (Spring Framework 6.2.0-RC3) breaks my use of a @MockitoSpyBean of the form doReturn(results).when(spyBean).method(argumentMatchers...).

That form is the one recommend by Mockito.

The error thrown says Argument passed to when() is not a mock!: https://github.com/JKatzwinkel/tla-es/actions/runs/11541063711/job/32122614536?pr=382#step:9:188 .

This problem did not occur with Spring Boot 3.4.0-M3 (Spring Framework 6.2.0-RC1).

This is where the spy (operations) gets stubbed:

https://github.com/JKatzwinkel/tla-es/blob/dependabot/gradle/spring-boot-bf23beedc8/src/test/java/tla/backend/service/SentenceServiceTest.java#L99-L103

        doReturn(hits).when(operations).search(
            any(org.springframework.data.elasticsearch.core.query.Query.class),
            eq(SentenceEntity.class),
            any()
        );

Please let me know if you need further information or if this is not an issue with spring boot. Thanks!

[sbrannen]

Hi @JKatzwinkel,

Thanks for reporting the issue you've encountered.

Please let me know if you need further information or if this is not an issue with spring boot.

It's difficult to assess based on the complexity of the tla-es project you've referenced.

Out of curiosity, why did you switch from a @MockBean for ElasticsearchOperations in the original tla-es project to a @MockitoSpyBean in your fork?

In any case, please provide a minimal sample application that reproduces the problem (that we can download and run), preferably one that does not require the use of Lombok or Docker containers.

Cheers,

Sam

[sbrannen]

@JKatzwinkel, I experimented with your application, and after some hacking... it appears that your use of @MockitoSpyBean may work with 6.2 snapshots.

In other words, this may effectively be a:

• duplicate of Bean Overrides for certain FactoryBean use cases no longer work #33800

So, before you take the time to create a minimal sample application, can you please try with 6.2.0-SNAPSHOT for Spring Framework dependencies such as org.springframework:spring-test?

If you need help setting up Gradle to use snapshots, this wiki page should prove useful.

Cheers,

Sam

[JKatzwinkel]

thank you very much for the investigating and good news! I will look into that and let you know!