Persisting a JMolecules Aggregate Association does not work when using EntityManager but works when using a Spring Data Repository

[MartinAhrer]

I have multiple JMolecules managed aggregate roots that use associations. When persisting them with a Spring Data JPA repository the associations are converted properly.

However when persisting the same object and its associations using an entity manager instance, this fails.

The full scenario has also been posted to https://stackoverflow.com/questions/79862584/persisting-a-jmolecules-aggregate-association-does-not-work-when-using-entityman.

A test showing both scenarios is:

@DataJpaTest()
@AutoConfigureTestDatabase(replace = AutoConfigureTestDatabase.Replace.NONE)
@TestPropertySource(properties = """
    spring.jpa.show-sql=true
""")
@Import([IntegrationTestConfiguration, CatalogIntegrationTestConfiguration])
class AssociationWithEntityManagerSpec extends AbstractRepositorySpecification {

    @Autowired
    ArticleRepository repository

    @Autowired
    MarketDataRepository marketDataRepository

    @Autowired
    RicRateRepository ricRateRepository

    ArticleFactory entityFactory = new ArticleFactory()
    RicRateFactory ricRateFactory = new RicRateFactory()
    MarketDataFactory marketDataFactory = new MarketDataFactory()


    def "find by id with repository"() {
        given:
        RicRate rate = ricRateFactory.newObject(id: new RicRateIdentifier('HKD'))
        rate = ricRateRepository.save(rate)

        MarketData marketData = marketDataFactory.newObject(rate: Association.forAggregate(rate))
        marketData = marketDataRepository.save(marketData)

        Article article = repository.save(entityFactory.newObject(marketData: Association.forAggregate(marketData)))

        when:
        Optional<AggregateRoot> result = repository.findById(article.id)

        then:
        result.isPresent()
    }

    def "find by id with entity manager"() {
        given:
        RicRate rate = ricRateFactory.newObject(id: new RicRateIdentifier('HKD'))
        rate = entityManager.merge(rate)

        MarketData marketData = marketDataFactory.newObject(rate: Association.forAggregate(rate))
        marketData = entityManager.merge(marketData)

        Article article = repository.save(entityFactory.newObject(marketData: Association.forAggregate(marketData)))

        when:
        Optional<AggregateRoot> result = repository.findById(article.id)

        then:
        result.isPresent()
    }
}

The test using the entity manager is showing the following exception which looks like the database key value HKD for the rate association is used to construct a MarketDataIdentifer which is a UUID. It really should create a RicRateIdentifier

So I assume, without the repository some meta data is missing to read the association properly? Since the byte buddy plugin is enhancing the entity with attribute converters I would expect that it wouldn't matter whether to use the repository or the entity manager.

jakarta.persistence.PersistenceException: Error attempting to apply AttributeConverter

    at org.hibernate.type.descriptor.converter.internal.AttributeConverterBean.toDomainValue(AttributeConverterBean.java:103)
    at org.hibernate.type.descriptor.converter.internal.AttributeConverterMutabilityPlan.deepCopyNotNull(AttributeConverterMutabilityPlan.java:59)
    at org.hibernate.type.descriptor.java.MutableMutabilityPlan.deepCopy(MutableMutabilityPlan.java:48)
    at org.hibernate.type.descriptor.java.JavaType.getReplacement(JavaType.java:140)
    at org.hibernate.type.internal.ConvertedBasicTypeImpl.replace(ConvertedBasicTypeImpl.java:337)
    at org.hibernate.type.TypeHelper.replace(TypeHelper.java:152)
    at org.hibernate.event.internal.DefaultMergeEventListener.entityIsTransient(DefaultMergeEventListener.java:292)
    at org.hibernate.event.internal.DefaultMergeEventListener.entityIsDetached(DefaultMergeEventListener.java:440)
    at org.hibernate.event.internal.DefaultMergeEventListener.merge(DefaultMergeEventListener.java:192)
    at org.hibernate.event.internal.DefaultMergeEventListener.doMerge(DefaultMergeEventListener.java:136)
    at org.hibernate.event.internal.DefaultMergeEventListener.onMerge(DefaultMergeEventListener.java:120)
    at org.hibernate.event.internal.DefaultMergeEventListener.onMerge(DefaultMergeEventListener.java:77)
    at org.hibernate.event.service.internal.EventListenerGroupImpl.fireEventOnEachListener(EventListenerGroupImpl.java:138)
    at org.hibernate.internal.SessionImpl.fireMerge(SessionImpl.java:797)
    at org.hibernate.internal.SessionImpl.merge(SessionImpl.java:782)
    at org.springframework.orm.jpa.SharedEntityManagerCreator$SharedEntityManagerInvocationHandler.invoke(SharedEntityManagerCreator.java:317)
    at at.dig.wertekasse.catalog.internal.AssociationWithEntityManagerSpec.find by id with entity manager(AssociationWithEntityManagerSpec.groovy:67)
Caused by: org.springframework.core.convert.ConversionFailedException: Failed to convert from type [java.lang.String] to type [java.util.UUID] for value [HKD]
    at org.springframework.core.convert.support.ConversionUtils.invokeConverter(ConversionUtils.java:47)
    at org.springframework.core.convert.support.GenericConversionService.convert(GenericConversionService.java:181)
    at org.jmolecules.spring.PrimitivesToIdentifierConverter.prepareSource(PrimitivesToIdentifierConverter.java:188)
    at org.jmolecules.spring.PrimitivesToIdentifierConverter.lambda$detectConstructor$14(PrimitivesToIdentifierConverter.java:174)
    at org.jmolecules.spring.PrimitivesToIdentifierConverter.convert(PrimitivesToIdentifierConverter.java:128)
    at org.jmolecules.spring.PrimitivesToAssociationConverter.resolveIdentifier(PrimitivesToAssociationConverter.java:123)
    at org.jmolecules.spring.PrimitivesToAssociationConverter.convert(PrimitivesToAssociationConverter.java:101)
    at org.jmolecules.spring.jpa.JakartaPersistenceAssociationAttributeConverter.convertToEntityAttribute(JakartaPersistenceAssociationAttributeConverter.java:60)
    at org.jmolecules.spring.jpa.JakartaPersistenceAssociationAttributeConverter.convertToEntityAttribute(JakartaPersistenceAssociationAttributeConverter.java:30)
    at org.hibernate.type.descriptor.converter.internal.AttributeConverterBean.toDomainValue(AttributeConverterBean.java:97)
    ... 16 more
Caused by: java.lang.IllegalArgumentException: Invalid UUID string: HKD
    at java.base/java.util.UUID.fromString1(UUID.java:282)
    at java.base/java.util.UUID.fromString(UUID.java:260)
    at org.springframework.core.convert.support.StringToUUIDConverter.convert(StringToUUIDConverter.java:37)
    at org.springframework.core.convert.support.StringToUUIDConverter.convert(StringToUUIDConverter.java:33)
    at org.springframework.core.convert.support.GenericConversionService$ConverterAdapter.convert(GenericConversionService.java:356)
    at org.springframework.core.convert.support.ConversionUtils.invokeConverter(ConversionUtils.java:41)
    ... 25 more

@NoArgsConstructor
@Getter
public class MarketData implements AggregateRoot<MarketData, MarketDataIdentifier> {
    private MarketDataIdentifier id;

    @Column(name = "rate_id")
    private Association<RicRate, RicRate.RicRateIdentifier> rate;

    public record MarketDataIdentifier(UUID id) implements Identifier {
        public MarketDataIdentifier() {
            this(UUID.randomUUID());
        }
    }
}

@Getter
@NoArgsConstructor
public class Article implements AggregateRoot<Article, ArticleIdentifier> {
    private ArticleIdentifier id;

    @Column(name = "market_data_id")
    private Association<MarketData, MarketDataIdentifier> marketData;

    public record ArticleIdentifier(UUID id) implements Identifier {
        public ArticleIdentifier() {
            this(UUID.randomUUID());
        }
    }
}

[odrotbohm]

Would you mind wrapping this into a stripped down example, ideally in plain Java and Kotlin? Hard to tell what's going on with all the extra things in place. Unless you use the jMolecules JPA code generation, you will have to declare custom extensions of JpaAssociationAttributeConverter typed to the identifier type reference and configure those for the Association fields.

That's needed as JPA Converter types need to expose a default constructor, and there's no way to find out which identifier type to convert to when reading from the database, except handing it into the constructor of JpaAssociationAttributeConverter. Alternatively, we recommend looking into more flexible database (integration) technologies (JDBC, MongoDB) that do not require such dances to get a simple value type read and written from and to the database. 😕

[MartinAhrer]

I have started creating a sample that I can publish to github. I will send an update once this is done. Thanks so far

[MartinAhrer]

You find a repository at https://github.com/MartinAhrer/bootolithic/tree/feature/association-issue.

The project setup is all Gradle and should just build fine. I have created a Spock spec ArticleRepositoryJmoleculesIssueSpec that reveals the reported issue. However the code is a bit different to the on posted initially as I had to delete and simplify some code to not violate my clients code policies.

Where a SizeIdentifier is supposed to be deserialized from the DB, a RebateIdentifier is deserialized which fails.

package at.martinahrer.bootolithic.catalog.internal

import org.jmolecules.ddd.types.Association
import org.springframework.beans.factory.annotation.Autowired
import org.springframework.boot.data.jpa.test.autoconfigure.DataJpaTest
import org.springframework.boot.jdbc.test.autoconfigure.AutoConfigureTestDatabase
import org.springframework.context.annotation.Import
import org.springframework.test.context.TestPropertySource

@DataJpaTest()
@AutoConfigureTestDatabase(replace = AutoConfigureTestDatabase.Replace.NONE)
@TestPropertySource(properties = """
    spring.jpa.show-sql=true
""")
@Import([IntegrationTestConfiguration, CatalogRepositoryIntegrationTestConfiguration])
class ArticleRepositoryJmoleculesIssueSpec extends AbstractRepositorySpecification<Article, ArticleIdentifier> {
    @Autowired
    ArticleRepository repository

    @Autowired
    ArticleFactory entityFactory

    SizeFactory sizeFactory = new SizeFactory()
    RebateFactory rebateFactory = new RebateFactory()
    ArticleFactory articleFactory = ArticleFactory.of()
    OrderFactory orderFactory = OrderFactory.of()
    OrderPositionFactory orderPositionFactory = OrderPositionFactory.of()
    OrderRepository orderRepository

    def "entity manager article"() {
        given:
        def size = sizeFactory.newObject(id: SizeIdentifier.of('LARGE'))
        size = entityManager.merge(size)

        def rebate = rebateFactory.newObject()
        rebate = entityManager.merge(rebate)

        def article = articleFactory.newObject(
            size: Association.forAggregate (size),
            rebate: Association.forAggregate (rebate))

        article = repository.save(article)

        when:
        def result = repository.findById(article.id)

        then:
        result.isPresent()
    }


    def "entity manager order"() {
        given:
        def size = sizeFactory.newObject(id: SizeIdentifier.of('LARGE'))
        size = entityManager.merge(size)

        def rebate = rebateFactory.newObject()
        rebate = entityManager.merge(rebate)

        def article = articleFactory.newObject(
            size: Association.forAggregate (size),
            rebate: Association.forAggregate (rebate))
        article = entityManager.merge(article)

        def position = orderPositionFactory.newObject(article: article.id)
        def order = orderFactory.newObject(positions: [position])
        order = orderRepository.save(order)

        when:
        def result = orderRepository.findById(order.id) // <<- break here

        then:
        result.isPresent()
    }
}

jakarta.persistence.PersistenceException: Error attempting to apply AttributeConverter

	at org.hibernate.type.descriptor.converter.internal.AttributeConverterBean.toDomainValue(AttributeConverterBean.java:103)
	at org.hibernate.type.descriptor.converter.internal.AttributeConverterMutabilityPlan.deepCopyNotNull(AttributeConverterMutabilityPlan.java:59)
	at org.hibernate.type.descriptor.java.MutableMutabilityPlan.deepCopy(MutableMutabilityPlan.java:48)
	at org.hibernate.type.descriptor.java.JavaType.getReplacement(JavaType.java:140)
	at org.hibernate.type.internal.ConvertedBasicTypeImpl.replace(ConvertedBasicTypeImpl.java:337)
	at org.hibernate.type.TypeHelper.replace(TypeHelper.java:152)
	at org.hibernate.event.internal.DefaultMergeEventListener.entityIsTransient(DefaultMergeEventListener.java:292)
	at org.hibernate.event.internal.DefaultMergeEventListener.entityIsDetached(DefaultMergeEventListener.java:440)
	at org.hibernate.event.internal.DefaultMergeEventListener.merge(DefaultMergeEventListener.java:192)
	at org.hibernate.event.internal.DefaultMergeEventListener.doMerge(DefaultMergeEventListener.java:136)
	at org.hibernate.event.internal.DefaultMergeEventListener.onMerge(DefaultMergeEventListener.java:120)
	at org.hibernate.event.internal.DefaultMergeEventListener.onMerge(DefaultMergeEventListener.java:77)
	at org.hibernate.event.service.internal.EventListenerGroupImpl.fireEventOnEachListener(EventListenerGroupImpl.java:138)
	at org.hibernate.internal.SessionImpl.fireMerge(SessionImpl.java:797)
	at org.hibernate.internal.SessionImpl.merge(SessionImpl.java:782)
	at org.springframework.orm.jpa.SharedEntityManagerCreator$SharedEntityManagerInvocationHandler.invoke(SharedEntityManagerCreator.java:317)
	at at.martinahrer.bootolithic.catalog.internal.ArticleRepositoryJmoleculesIssueSpec.entity manager order(ArticleRepositoryJmoleculesIssueSpec.groovy:76)
Caused by: java.lang.IllegalArgumentException: Invalid TSID string: "LARGE"
	at io.hypersistence.tsid.TSID.toCharArray(TSID.java:681)
	at io.hypersistence.tsid.TSID.from(TSID.java:238)
	at at.martinahrer.bootolithic.catalog.RebateIdentifier.of(RebateIdentifier.java:13)
	at org.springframework.util.ReflectionUtils.invokeMethod(ReflectionUtils.java:281)
	at org.jmolecules.spring.PrimitivesToIdentifierConverter.lambda$detectCreatorMethod$6(PrimitivesToIdentifierConverter.java:158)
	at org.jmolecules.spring.PrimitivesToIdentifierConverter.convert(PrimitivesToIdentifierConverter.java:130)
	at org.jmolecules.spring.PrimitivesToAssociationConverter.resolveIdentifier(PrimitivesToAssociationConverter.java:123)
	at org.jmolecules.spring.PrimitivesToAssociationConverter.convert(PrimitivesToAssociationConverter.java:101)

[odrotbohm]

Is there a chance we set up a separate non-Groovy, non-Spock, non-Gradle project to reproduce this? I have a hard time even executing the current reproducer, and I can't get the ByteBuddy plugin output to verify it's setting up the AttributeConverters properly.

The stack trace suggests the code already fails at the repository.save(…) call, resulting in a merge(…) on the EntityManager. This in turn likely stems from the fact that you're using application-assigned identifiers, which is indeed only properly supported through Spring Data's Persistable and the jMolecules ByteBuddy integration adding the corresponding implementation during the bytecode enhancement. I.e., unless the ByteBuddy step sees Spring Data on the classpath, it doesn't augment the entity type to support these identifiers properly. It would be really good to see the output of the ByteBuddy build step, but I can't get that to reveal.

[MartinAhrer]

Groovy and Spock is quite some code to replace as well as Gradle. That would take a while. Anyway thanks for your patience so far.

Running ./gradlew clean byteBuddy --info will probably output the information you are asking for. I'm attaching it here.
Maybe meanwhile that provides some hints on what's going on.

No jmolecules.config found traversing /Users/martin/Development/spaces/codebreeze.io/architecture/bootolithic/build/classes/java/javaByteBuddyRaw

□─ at.martinahrer.bootolithic.catalog.Article
├─ JPA - Adding @@j.p.Entity(name="").
├─ JPA - Adding nullability verification using new callback methods.
├─ JPA - Default constructor already present.
├─ JPA - Defaulting id mapping to @j.p.EmbeddedId().
├─ JPA - Implementing equals(…) based on identifier.
├─ JPA - Implementing hashCode() based on identifier.
├─ Spring Data JPA - Implementing o.s.d.d.Persistable<a.m.b.c.ArticleIdentifier>.
├─ Spring JPA - Adding @o.s.a.g.Generated() to generated at.martinahrer.bootolithic.catalog.RebateAssociationConverter$jMolecules$UT6aFrEh.
├─ Spring JPA - Adding @o.s.a.g.Generated() to generated at.martinahrer.bootolithic.catalog.SizeAssociationConverter$jMolecules$GwGajrQl.
├─ Spring JPA - rebate - Adding @j.p.Convert(converter=a.m.b.c.RebateAssociationConverter$jMolecules$UT6aFrEh).
└─ Spring JPA - size - Adding @j.p.Convert(converter=a.m.b.c.SizeAssociationConverter$jMolecules$GwGajrQl).

□─ at.martinahrer.bootolithic.catalog.ArticleIdentifier
├─ JPA - Adding @@j.p.Embeddable().
├─ JPA - Default constructor already present.
├─ JPA - Not adding @@j.p.Embeddable() because type is already annotated with it.
└─ JPA - a.m.b.c.ArticleIdentifier - Implement j.i.Serializable.

□─ at.martinahrer.bootolithic.catalog.ArticlePriceCalculatorService
├─ Spring - Adding @o.s.s.Service.
└─ Spring - Not adding @o.j.d.a.Service, already present.

□─ at.martinahrer.bootolithic.catalog.ArticleService
└─ Spring - Adding @o.j.d.a.Service.

□─ at.martinahrer.bootolithic.catalog.BaseKey
├─ JPA - Adding @@j.p.Embeddable().
└─ JPA - Adding default constructor.

□─ at.martinahrer.bootolithic.catalog.CurrencyCode
├─ JPA - Adding @@j.p.Embeddable().
└─ JPA - Adding default constructor.

□─ at.martinahrer.bootolithic.catalog.Rebate
├─ JPA - Adding @@j.p.Entity(name="").
├─ JPA - Adding nullability verification using new callback methods.
├─ JPA - Default constructor already present.
├─ JPA - Defaulting id mapping to @j.p.EmbeddedId().
├─ JPA - Implementing equals(…) based on identifier.
├─ JPA - Implementing hashCode() based on identifier.
└─ Spring Data JPA - Implementing o.s.d.d.Persistable<a.m.b.c.RebateIdentifier>.

□─ at.martinahrer.bootolithic.catalog.RebateIdentifier
├─ JPA - Adding @@j.p.Embeddable().
├─ JPA - Default constructor already present.
├─ JPA - Not adding @@j.p.Embeddable() because type is already annotated with it.
└─ JPA - a.m.b.c.RebateIdentifier - Implement j.i.Serializable.

□─ at.martinahrer.bootolithic.catalog.RebateService
├─ Spring - Adding @o.s.s.Service.
└─ Spring - Not adding @o.j.d.a.Service, already present.

□─ at.martinahrer.bootolithic.catalog.Size
├─ JPA - Adding @@j.p.Entity(name="").
├─ JPA - Adding nullability verification using new callback methods.
├─ JPA - Default constructor already present.
├─ JPA - Defaulting id mapping to @j.p.EmbeddedId().
├─ JPA - Implementing equals(…) based on identifier.
├─ JPA - Implementing hashCode() based on identifier.
└─ Spring Data JPA - Implementing o.s.d.d.Persistable<a.m.b.c.SizeIdentifier>.

□─ at.martinahrer.bootolithic.catalog.SizeIdentifier
├─ JPA - Adding @@j.p.Embeddable().
├─ JPA - Adding default constructor.
├─ JPA - Not adding @@j.p.Embeddable() because type is already annotated with it.
└─ JPA - a.m.b.c.SizeIdentifier - Implement j.i.Serializable.

□─ at.martinahrer.bootolithic.catalog.SizeService
├─ Spring - Adding @o.s.s.Service.
└─ Spring - Not adding @o.j.d.a.Service, already present.

□─ at.martinahrer.bootolithic.catalog.internal.ArticleRepository
└─ Spring Data - Adding @o.j.d.a.Repository.

□─ at.martinahrer.bootolithic.catalog.internal.RebateRepository
└─ Spring Data - Adding @o.j.d.a.Repository.

□─ at.martinahrer.bootolithic.catalog.internal.ShiftedMiddle
├─ JPA - Adding @@j.p.Embeddable().
└─ JPA - Adding default constructor.

□─ at.martinahrer.bootolithic.catalog.internal.SizeRepository
└─ Spring Data - Adding @o.j.d.a.Repository.

□─ at.martinahrer.bootolithic.order.Address
├─ JPA - Adding @@j.p.Embeddable().
├─ JPA - Adding default constructor.
└─ JPA - Not adding @@j.p.Embeddable() because type is already annotated with it.

□─ at.martinahrer.bootolithic.order.Customer
├─ JPA - Adding @@j.p.Embeddable().
├─ JPA - Adding default constructor.
└─ JPA - Not adding @@j.p.Embeddable() because type is already annotated with it.

□─ at.martinahrer.bootolithic.order.EmailAddress
├─ JPA - Adding @@j.p.Embeddable().
└─ JPA - Adding default constructor.

□─ at.martinahrer.bootolithic.order.Iban
├─ JPA - Adding @@j.p.Embeddable().
└─ JPA - Adding default constructor.

□─ at.martinahrer.bootolithic.order.Order
├─ JPA - Adding @@j.p.Entity(name="").
├─ JPA - Adding nullability verification to existing callback method assignOrderIdentifierToPositions().
├─ JPA - Adding nullability verification using new callback methods.
├─ JPA - Default constructor already present.
├─ JPA - Defaulting id mapping to @j.p.EmbeddedId().
├─ JPA - Implementing equals(…) based on identifier.
├─ JPA - Implementing hashCode() based on identifier.
└─ Spring Data JPA - Implementing o.s.d.d.Persistable<a.m.b.o.OrderIdentifier>.

□─ at.martinahrer.bootolithic.order.OrderIdentifier
├─ JPA - Adding @@j.p.Embeddable().
├─ JPA - Default constructor already present.
├─ JPA - Not adding @@j.p.Embeddable() because type is already annotated with it.
└─ JPA - a.m.b.o.OrderIdentifier - Implement j.i.Serializable.

□─ at.martinahrer.bootolithic.order.OrderNumber
├─ JPA - Adding @@j.p.Embeddable().
└─ JPA - Adding default constructor.

□─ at.martinahrer.bootolithic.order.OrderPosition
├─ JPA - Adding @@j.p.Entity(name="").
├─ JPA - Adding nullability verification using new callback methods.
├─ JPA - Default constructor already present.
├─ JPA - Defaulting id mapping to @j.p.EmbeddedId().
├─ JPA - Implementing equals(…) based on identifier.
└─ JPA - Implementing hashCode() based on identifier.

□─ at.martinahrer.bootolithic.order.OrderPositionIdentifier
├─ JPA - Adding @@j.p.Embeddable().
├─ JPA - Default constructor already present.
├─ JPA - Not adding @@j.p.Embeddable() because type is already annotated with it.
└─ JPA - a.m.b.o.OrderPositionIdentifier - Implement j.i.Serializable.

□─ at.martinahrer.bootolithic.order.OrderService
├─ Spring - Adding @o.s.s.Service.
└─ Spring - Not adding @o.j.d.a.Service, already present.

□─ at.martinahrer.bootolithic.order.internal.OrderRepository
└─ Spring Data - Adding @o.j.d.a.Repository.

[MartinAhrer]

I have pushed a fix of some tests that were failing and unrelated to the bug. Now running ./gradlew check will only fail tests related to that issue.

[odrotbohm]

That helps. That said, I can't see a commit post Feb. 6th. 🤔

[MartinAhrer]

Sorry, that push didn't go through. You should see it now.

[odrotbohm]

I'm not getting any further, here. Trying to run the failing OrderRepositorySpec in IDEA, I get:

Caught: groovy.lang.GroovyRuntimeException: This script or class could not be run.
It should either:
- have a main method,
- be a JUnit test or extend GroovyTestCase,
- implement the Runnable interface,
- or be compatible with a registered script runner. Known runners:
  * org.apache.groovy.plugin.DefaultRunners$Junit3TestRunner
  * org.apache.groovy.plugin.DefaultRunners$Junit3SuiteRunner
  * org.apache.groovy.plugin.DefaultRunners$Junit4TestRunner

groovy.lang.GroovyRuntimeException: This script or class could not be run.
It should either:
- have a main method,
- be a JUnit test or extend GroovyTestCase,
- implement the Runnable interface,
- or be compatible with a registered script runner. Known runners:
  * org.apache.groovy.plugin.DefaultRunners$Junit3TestRunner
  * org.apache.groovy.plugin.DefaultRunners$Junit3SuiteRunner
  * org.apache.groovy.plugin.DefaultRunners$Junit4TestRunner

I apologize, but I can't spend any more time on Groovy, Spock, etc., when the alleged issue is with jMolecules' JPA integration. If it's apparently the attribute converters using the wrong identifier types, we should be able to reproduce this with a simple Java aggregate arrangement that uses two Association properties pointing to Identifier implementations backed by incompatible primitives. I can try to set something like this up to verify, but I'm afraid it's not going to be in the immediate future.

[MartinAhrer]

Sorry that this is giving you such a hard time. Should run out of the box at least with IntelliJ. Allow me a few days to remove all groovy. Expect something at then end of the week(end).

[MartinAhrer]

@odrotbohm sorry again for expecting you to work with an unnecessary complex sample. Here is what I should have provided in first place. Everything stripped down to the minimum. All Java, no Spock/Groovy.
Hope you are getting along with Testcontainers and Gradle which is still in.

https://github.com/MartinAhrer/jmolecules-association-issue

package at.martinahrer.bootolithic.catalog.internal;

import at.martinahrer.bootolithic.TestcontainersConfiguration;
import at.martinahrer.bootolithic.catalog.Article;
import at.martinahrer.bootolithic.catalog.ArticleIdentifier;
import at.martinahrer.bootolithic.catalog.Rebate;
import at.martinahrer.bootolithic.catalog.RebateIdentifier;
import at.martinahrer.bootolithic.catalog.Size;
import at.martinahrer.bootolithic.catalog.SizeIdentifier;
import jakarta.persistence.EntityManager;
import jakarta.persistence.PersistenceContext;
import org.javamoney.moneta.Money;
import org.jetbrains.annotations.NotNull;
import org.jmolecules.ddd.types.Association;
import org.junit.jupiter.api.Assertions;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.data.jpa.test.autoconfigure.DataJpaTest;
import org.springframework.boot.jdbc.test.autoconfigure.AutoConfigureTestDatabase;
import org.springframework.context.annotation.Import;
import org.springframework.test.context.TestPropertySource;

import java.math.BigDecimal;

@DataJpaTest()
@AutoConfigureTestDatabase()
@TestPropertySource(properties = """
    spring.jpa.show-sql=true
""")
@Import(TestcontainersConfiguration.class)
class ArticleRepositoryJmoleculesIssueIntegrationTest {
    @Autowired
    ArticleRepository repository;

    @PersistenceContext
    EntityManager entityManager;

    @Test
    void repositoryArticle() {
        //given:
        var article = buildArticle();

        article = repository.save(article);

        //when:
        var result = repository.findById(article.getId());

        //then:
        Assertions.assertTrue(result.isPresent());
    }

    @Test
    void entityManagerArticle() {
        //given:
        var article = buildArticle();

        article = entityManager.merge(article);

        //when:
        var result = entityManager.find(Article.class, article.getId());

        //then:
        Assertions.assertNotNull(result);
    }

    private @NotNull Article buildArticle() {
        var size = new Size(SizeIdentifier.of("Large"), "Large", BigDecimal.TWO);
        size = entityManager.merge(size);

        var rebate = new Rebate(new RebateIdentifier(), "big savings", BigDecimal.valueOf(0.05));
        rebate = entityManager.merge(rebate);

        return new Article(
            new ArticleIdentifier(),
            "Spring I/O sneakers",
            2,
            Money.of(120, "EUR"),
            Association.forAggregate(rebate),
            Association.forAggregate(size));
    }
}