Serialization of Java Money with zalando/jackson-datatype-money fails after upgrade to Spring Boot 2.3.5

[darioseidl]

I first reported this issue here but I know believe this is a bug in Spring Data Rest.

After upgrading from Spring Boot 2.3.4 to Spring Boot 2.3.5, which comes with Spring Data Neumann-SR5, serialization of Money with the MonetaryAmountSerializer of jackson-datatype-money fails with the following error:

org.springframework.http.converter.HttpMessageNotWritableException: Could not write JSON: Can not start an object, expecting field name (context: Object); nested exception is com.fasterxml.jackson.core.JsonGenerationException: Can not start an object, expecting field name (context: Object)
	at org.springframework.http.converter.json.AbstractJackson2HttpMessageConverter.writeInternal(AbstractJackson2HttpMessageConverter.java:351)
	at org.springframework.http.converter.AbstractGenericHttpMessageConverter.write(AbstractGenericHttpMessageConverter.java:104)
	at org.springframework.web.servlet.mvc.method.annotation.AbstractMessageConverterMethodProcessor.writeWithMessageConverters(AbstractMessageConverterMethodProcessor.java:277)
	at org.springframework.web.servlet.mvc.method.annotation.HttpEntityMethodProcessor.handleReturnValue(HttpEntityMethodProcessor.java:219)
	at org.springframework.web.method.support.HandlerMethodReturnValueHandlerComposite.handleReturnValue(HandlerMethodReturnValueHandlerComposite.java:82)
	at org.springframework.hateoas.server.mvc.RepresentationModelProcessorHandlerMethodReturnValueHandler.handleReturnValue(RepresentationModelProcessorHandlerMethodReturnValueHandler.java:134)
	at org.springframework.web.method.support.HandlerMethodReturnValueHandlerComposite.handleReturnValue(HandlerMethodReturnValueHandlerComposite.java:82)
	at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:123)
	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:878)
	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:792)
	at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87)
	at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1040)
	at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:943)
	at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006)
	at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:898)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:626)
	at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:733)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:103)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at at.rechnerherz.busangebot.config.logback.MdcFilter.doFilter(MdcFilter.kt:32)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at net.bull.javamelody.MonitoringFilter.doFilter(MonitoringFilter.java:239)
	at net.bull.javamelody.MonitoringFilter.doFilter(MonitoringFilter.java:215)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:320)
	at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:126)
	at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:90)
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)
	at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:118)
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)
	at org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:137)
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)
	at org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:111)
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)
	at org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:158)
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)
	at org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:63)
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)
	at org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:200)
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)
	at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:116)
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)
	at org.springframework.security.web.csrf.CsrfFilter.doFilterInternal(CsrfFilter.java:117)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)
	at org.springframework.web.filter.CorsFilter.doFilterInternal(CorsFilter.java:92)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)
	at org.springframework.security.web.header.HeaderWriterFilter.doHeadersAfter(HeaderWriterFilter.java:92)
	at org.springframework.security.web.header.HeaderWriterFilter.doFilterInternal(HeaderWriterFilter.java:77)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)
	at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:105)
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)
	at org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter.doFilterInternal(WebAsyncManagerIntegrationFilter.java:56)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)
	at org.springframework.security.web.access.channel.ChannelProcessingFilter.doFilter(ChannelProcessingFilter.java:157)
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)
	at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:215)
	at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:178)
	at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:358)
	at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:271)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.springframework.boot.actuate.metrics.web.servlet.WebMvcMetricsFilter.doFilterInternal(WebMvcMetricsFilter.java:93)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:97)
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:542)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:143)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:78)
	at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:690)
	at org.apache.catalina.valves.RemoteIpValve.invoke(RemoteIpValve.java:747)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)
	at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:374)
	at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)
	at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:868)
	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1590)
	at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
	at java.base/java.lang.Thread.run(Thread.java:829)
Caused by: com.fasterxml.jackson.core.JsonGenerationException: Can not start an object, expecting field name (context: Object)
	at com.fasterxml.jackson.core.JsonGenerator._reportError(JsonGenerator.java:2151)
	at com.fasterxml.jackson.core.json.JsonGeneratorImpl._reportCantWriteValueExpectName(JsonGeneratorImpl.java:233)
	at com.fasterxml.jackson.core.json.JsonGeneratorImpl._verifyPrettyValueWrite(JsonGeneratorImpl.java:223)
	at com.fasterxml.jackson.core.json.UTF8JsonGenerator._verifyValueWrite(UTF8JsonGenerator.java:1132)
	at com.fasterxml.jackson.core.json.UTF8JsonGenerator.writeStartObject(UTF8JsonGenerator.java:363)
	at org.zalando.jackson.datatype.money.MonetaryAmountSerializer.serialize(MonetaryAmountSerializer.java:73)
	at org.zalando.jackson.datatype.money.MonetaryAmountSerializer.serialize(MonetaryAmountSerializer.java:19)
	at org.springframework.hateoas.EntityModel$MapSuppressingUnwrappingSerializer.serialize(EntityModel.java:218)
	at com.fasterxml.jackson.databind.ser.impl.UnwrappingBeanPropertyWriter.serializeAsField(UnwrappingBeanPropertyWriter.java:127)
	at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:755)
	at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:178)
	at com.fasterxml.jackson.databind.SerializerProvider.defaultSerializeValue(SerializerProvider.java:1119)
	at org.springframework.data.rest.webmvc.json.PersistentEntityJackson2Module$PersistentEntityResourceSerializer.serialize(PersistentEntityJackson2Module.java:207)
	at org.springframework.data.rest.webmvc.json.PersistentEntityJackson2Module$PersistentEntityResourceSerializer.serialize(PersistentEntityJackson2Module.java:154)
	at com.fasterxml.jackson.databind.SerializerProvider.defaultSerializeValue(SerializerProvider.java:1119)
	at org.springframework.data.rest.webmvc.json.PersistentEntityJackson2Module$NestedEntitySerializer.serialize(PersistentEntityJackson2Module.java:375)
	at com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:728)
	at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:755)
	at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:178)
	at com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:728)
	at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:755)
	at com.fasterxml.jackson.databind.ser.impl.UnwrappingBeanSerializer.serialize(UnwrappingBeanSerializer.java:134)
	at org.springframework.data.rest.webmvc.json.PersistentEntityJackson2Module$ProjectionResourceContentSerializer.serialize(PersistentEntityJackson2Module.java:757)
	at org.springframework.data.rest.webmvc.json.PersistentEntityJackson2Module$ProjectionResourceContentSerializer.serialize(PersistentEntityJackson2Module.java:730)
	at org.springframework.hateoas.EntityModel$MapSuppressingUnwrappingSerializer.serialize(EntityModel.java:218)
	at com.fasterxml.jackson.databind.ser.impl.UnwrappingBeanPropertyWriter.serializeAsField(UnwrappingBeanPropertyWriter.java:127)
	at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:755)
	at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:178)
	at com.fasterxml.jackson.databind.SerializerProvider.defaultSerializeValue(SerializerProvider.java:1119)
	at org.springframework.data.rest.webmvc.json.PersistentEntityJackson2Module$PersistentEntityResourceSerializer.serialize(PersistentEntityJackson2Module.java:194)
	at org.springframework.data.rest.webmvc.json.PersistentEntityJackson2Module$PersistentEntityResourceSerializer.serialize(PersistentEntityJackson2Module.java:154)
	at com.fasterxml.jackson.databind.ser.impl.IndexedListSerializer.serializeContents(IndexedListSerializer.java:119)
	at com.fasterxml.jackson.databind.ser.impl.IndexedListSerializer.serialize(IndexedListSerializer.java:79)
	at com.fasterxml.jackson.databind.ser.impl.IndexedListSerializer.serialize(IndexedListSerializer.java:18)
	at com.fasterxml.jackson.datatype.hibernate5.PersistentCollectionSerializer.serialize(PersistentCollectionSerializer.java:243)
	at com.fasterxml.jackson.databind.ser.std.MapSerializer.serializeFields(MapSerializer.java:726)
	at com.fasterxml.jackson.databind.ser.std.MapSerializer.serializeWithoutTypeInfo(MapSerializer.java:681)
	at com.fasterxml.jackson.databind.ser.std.MapSerializer.serialize(MapSerializer.java:637)
	at com.fasterxml.jackson.databind.ser.std.MapSerializer.serialize(MapSerializer.java:33)
	at com.fasterxml.jackson.datatype.hibernate5.PersistentCollectionSerializer.serialize(PersistentCollectionSerializer.java:243)
	at org.springframework.hateoas.mediatype.hal.Jackson2HalModule$HalResourcesSerializer.serialize(Jackson2HalModule.java:351)
	at org.springframework.hateoas.mediatype.hal.Jackson2HalModule$HalResourcesSerializer.serialize(Jackson2HalModule.java:303)
	at com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:728)
	at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:755)
	at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:178)
	at com.fasterxml.jackson.databind.ser.DefaultSerializerProvider._serialize(DefaultSerializerProvider.java:480)
	at com.fasterxml.jackson.databind.ser.DefaultSerializerProvider.serializeValue(DefaultSerializerProvider.java:319)
	at com.fasterxml.jackson.databind.ObjectWriter$Prefetch.serialize(ObjectWriter.java:1516)
	at com.fasterxml.jackson.databind.ObjectWriter.writeValue(ObjectWriter.java:1006)
	at org.springframework.http.converter.json.AbstractJackson2HttpMessageConverter.writeInternal(AbstractJackson2HttpMessageConverter.java:342)
	... 107 common frames omitted

The problem seems to be that after the upgrade, the Money is attempted to be serialized as EntityModel<Money> instead of just plain Money. We have Money attributes in our entities and they should be serialized as, for example,

   "price": {
      "amount": 100.0
      "currency": "EUR"
   }

They are compound values (with two database columns and should be serialized as JSON objects with two fields), they are not entities. Any idea what changed in Spring Data Rest that made them EntityModel<Money> during the serialization?

The jackson-datatype-money comes with a MoneyModule, which we register as a bean and which adds a serializer

In org.zalando.jackson.datatype.money.MoneyModule:

    @Override
    public void setupModule(final SetupContext context) {
        final SimpleSerializers serializers = new SimpleSerializers();
        serializers.addSerializer(CurrencyUnit.class, new CurrencyUnitSerializer());
        serializers.addSerializer(MonetaryAmount.class, new MonetaryAmountSerializer(names, writer, formatFactory));
        context.addSerializers(serializers);

        final SimpleDeserializers deserializers = new SimpleDeserializers();
        deserializers.addDeserializer(CurrencyUnit.class, new CurrencyUnitDeserializer());
        deserializers.addDeserializer(MonetaryAmount.class, new MonetaryAmountDeserializer<>(amountFactory, names));
        // for reading into concrete implementation types
        deserializers.addDeserializer(Money.class, new MonetaryAmountDeserializer<>(moneyFactory, names));
        deserializers.addDeserializer(FastMoney.class, new MonetaryAmountDeserializer<>(fastMoneyFactory, names));
        deserializers.addDeserializer(RoundedMoney.class, new MonetaryAmountDeserializer<>(roundedMoneyFactory, names));
        context.addDeserializers(deserializers);
    }

In org.zalando.jackson.datatype.money.MonetaryAmountSerializer:

@Override
    public void serialize(final MonetaryAmount value, final JsonGenerator generator, final SerializerProvider provider)
            throws IOException {

        final CurrencyUnit currency = value.getCurrency();
        @Nullable final String formatted = format(value, provider);

        generator.writeStartObject();
        {
            generator.writeObjectField(names.getAmount(), writer.write(value));
            generator.writeObjectField(names.getCurrency(), currency);

            if (formatted != null) {
                generator.writeStringField(names.getFormatted(), formatted);
            }
        }
        generator.writeEndObject();
    }

generator.writeStartObject() fails, because there was already an object started.

I will provide a demo to reproduce the issue if it helps to fix this.

[odrotbohm]

Do you have a minimal sample project reproducing the problem available?

[darioseidl]

I've prepared a sample project now: https://github.com/darioseidl/demo-2056

It's a very minimal Spring Initializer demo with spring-web, spring-data-rest, and org.zalando:jackson-datatype-money.

[darioseidl]

A breakpoint on PersistentEntityJackson2Module line 387 (in Spring Boot version 2.5.4) might help to reveal the problem. There toModel(value, provider) takes a Money as value and returns a wrapped EntityModel<Money>.

Edit: or rather in BeanPropertyWriter.serializeAsField, it doesn't use the correct serializer. It should use MonetaryAmountSerializer, not PersistentEntityJackson2Module.NestedEntitySerializer.

[evgeniymelnikov]

faced the same problem

[darioseidl]

@odrotbohm Did you get a chance to look at this? I imagine that somebody who knows about the Spring Data Rest internals might be able to quickly tell whats wrong here. I don't understand enough to tell where it decides which serializer will be used. Afaict, the MoneyModule and the MonetaryAmountSerializer are still registered correctly (if i remove the module, the error message is different), but instead the PersistentEntityJackson2Module.NestedEntitySerializer is used on the value object as if it was a nested enitity.

[darioseidl]

Okay... after some more debugging, I've found that the problems seems to be in org.springframework.data.mapping.context.AbstractMappingContext.createAndRegisterProperty:

private void createAndRegisterProperty(Property input) {

    P property = createPersistentProperty(input, entity, simpleTypeHolder);

    if (property.isTransient()) {
        return;
    }

    if (!input.isFieldBacked() && !property.usePropertyAccess()) {
        return;
    }

    entity.addPersistentProperty(property);

    if (property.isAssociation()) {
        entity.addAssociation(property.getRequiredAssociation());
    }

    if (entity.getType().equals(property.getRawType())) {
        return;
    }

    property.getPersistentEntityTypes().forEach(AbstractMappingContext.this::addPersistentEntity);
}

This is called for each property of the entity, but none of the ifs with return evaluate to true for the Money amount or currency properties, so the addPersistentEntity is called and Money is registered as a persistent entity.

I don't know what has changed to cause this regression, but I see that there is some ongoing work in this logic here: spring-projects/spring-data-commons@ab74551

In this commit a check shouldCreatePersistentEntityFor was added, which should probably also prevent Money from being registered as a persistent entity:

 * Returns whether a {@link PersistentEntity} instance should be created for the given {@link TypeInformation}. By
 * default this will reject all types considered simple and non-supported Kotlin classes, but it might be necessary to
 * tweak that in case you have registered custom converters for top level types (which renders them to be considered
 * simple) but still need meta-information about them.
 *
 * @param type will never be {@literal null}.
 * @return
 */
protected boolean shouldCreatePersistentEntityFor(TypeInformation<?> type) {

    if (simpleTypeHolder.isSimpleType(type.getType())) {
        return false;
    }

    if (NullableWrapperConverters.supports(type.getType())) {
        return false;
    }

    return !KotlinDetector.isKotlinType(type.getType()) || KotlinReflectionUtils.isSupportedKotlinClass(type.getType());
}

Afaict, this alone would not be enough to fix the regression, because simpleTypeHolder.isSimpleType would return false for org.javamoney.moneta.Money.

@mp911de Could you maybe take a look at this?