Document limitations of using deferred JPA bootstrap and early access to JPA

[Miicroo]

Version: Spring Boot 2.3.x

Minimal example: Autowiring for instance an objectMapper into a custom AttributeConverter works fine with all versions of spring-boot v2.2.x. However, when upgrading to spring-boot 2.3.0 the objectMapper is no longer autowired and the application freezes indefinitely and doesn't start up.

Example of AttributeConverter:

@Component
public class StringListToJsonConverter implements AttributeConverter<List<String>, String> {

    private static ObjectMapper objectMapper;

    @Autowired
    public void init(ObjectMapper objectMapper) {
        this.objectMapper = objectMapper;
    }

    @Override
    public String convertToDatabaseColumn(List<String> documentObj) {
        // Do some logic...
    }

    @Override
    public List<String> convertToEntityAttribute(String documentStr) {
        // Do some logic...
    }
}

[snicoll]

Thanks for the report. It is likely to be due to JPA deferred mode. Can you please try with the latest release for a start, i.e. 2.3.5.RELEASE? If that's still broken, please share a minimal example we can actually run (rather that code in text). You can do so by attaching a zip to this issue or share a link to a GitHub repository.

[Miicroo]

@snicoll Tried using default as BootstrapMode, and now all beans are autowired correctly. Thank you for the help, I am closing this since their was no real issue :)

[snicoll]

Thanks for letting us know but that's working around the issue. We'd like to understand if we could do something so that your use case works out-of-the-box. Can you please test your application unchanged (without the default bootstrap mode) with Spring Boot 2.3.5.RELEASE? If that still breaks, could you help us by sharing a small sample?

[steklopod]

Have similar issue when using gradle plugin and @AutoConfigureMockMvc

id("org.springframework.boot") version "2.3.5.RELEASE"

All @IntegrationTest ok, but when first @WebTest test freeze and never ends.

But with 2.3.4.RELEASE - no such problem

// OK
@SpringBootTest
@Target(CLASS)
@Retention(RUNTIME)
@ActiveProfiles("test")
annotation class IntegrationTest

// Freeze (deadlock)
@Target(CLASS)
@Retention(RUNTIME)
@IntegrationTest
@AutoConfigureMockMvc
annotation class WebTest

Also in this project I'm using liquibase. No exception. Just deadlock

@WebTest
internal class UserControllerTest(@Autowired private val mockMvc: MockMvc) {
    private val baseUrl = "/user"

    @Test
    fun userTest() {
        mockMvc.perform(postWithTokenInHeader(baseUrl))
//            .andDo(MockMvcResultHandlers.print())
            .andExpect(status().isOk)
}

[wilkinsona]

Thanks, @steklopod. Could you please open a new issue with a minimal sample that reproduces the problem?