MappingException: Couldn't find PersistentEntity for type class ...domain.User$HibernateProxy

[godzzo]

Description

I wrote a custom Controller for dynamic filtering, and try to respond with the result (paged and projected entities), it failed with the lazy loaded property (HibernateProxy - Image.creator) when PersistentEntityJackson2Module$ProjectionSerializer try to serialize it.

It is a working project on spring-boot 2.5.8, and after I changed to 2.6.2 this Exception happened.

MVC Controller

@RequestMapping(value = ["/{repository}/filterImages"], method = [RequestMethod.GET])
fun imagesFilter(filter: ImageFilter,
	pageable: Pageable,
	assembler: PagedResourcesAssembler<ImageProjection>,
	session: HttpSession
) : ResponseEntity<PagedModel<EntityModel<ImageProjection>>> {
	val result = filterService.invoke(filter, session, pageable)

	val projected = result.map {
		factory.createProjection(ImageProjection::class.java, it)
	}

	return ResponseEntity(assembler.toModel(projected), HttpStatus.OK)
}

Entity

@Entity
@EntityListeners(ImageEntityListener::class)
@Table(name = "image")
class Image {
	...
	@ManyToOne(fetch = FetchType.LAZY)
	@JoinColumn(name = "creator_id", nullable=true,
		foreignKey = ForeignKey(name = "fk_image_creator")
	)
	override var creator: User? = null
	...
}

Exception

Caused by: org.springframework.data.mapping.MappingException: Couldn't find PersistentEntity for type class ...domain.User$HibernateProxy$sTtGM2R0!
	at org.springframework.data.mapping.context.MappingContext.getRequiredPersistentEntity(MappingContext.java:79) ~[spring-data-commons-2.6.0.jar:2.6.0]
	at org.springframework.data.mapping.context.PersistentEntities.getRequiredPersistentEntity(PersistentEntities.java:115) ~[spring-data-commons-2.6.0.jar:2.6.0]
	at org.springframework.data.rest.core.support.DefaultSelfLinkProvider.entityIdentifierOrNull(DefaultSelfLinkProvider.java:120) ~[spring-data-rest-core-3.6.0.jar:3.6.0]
	at org.springframework.data.rest.core.support.DefaultSelfLinkProvider.getResourceId(DefaultSelfLinkProvider.java:109) ~[spring-data-rest-core-3.6.0.jar:3.6.0]
	at org.springframework.data.rest.core.support.DefaultSelfLinkProvider.createSelfLinkFor(DefaultSelfLinkProvider.java:84) ~[spring-data-rest-core-3.6.0.jar:3.6.0]
	at org.springframework.data.rest.core.support.DefaultSelfLinkProvider.createSelfLinkFor(DefaultSelfLinkProvider.java:74) ~[spring-data-rest-core-3.6.0.jar:3.6.0]
	at org.springframework.data.rest.webmvc.mapping.DefaultLinkCollector.lambda$createSelfLink$1(DefaultLinkCollector.java:129) ~[spring-data-rest-webmvc-3.6.0.jar:3.6.0]
	at java.base/java.util.Optional.orElseGet(Optional.java:369) ~[na:na]
	at org.springframework.data.rest.webmvc.mapping.DefaultLinkCollector.createSelfLink(DefaultLinkCollector.java:129) ~[spring-data-rest-webmvc-3.6.0.jar:3.6.0]
	at org.springframework.data.rest.webmvc.mapping.DefaultLinkCollector.getLinksFor(DefaultLinkCollector.java:95) ~[spring-data-rest-webmvc-3.6.0.jar:3.6.0]
	at org.springframework.data.rest.webmvc.mapping.DefaultLinkCollector.getLinksFor(DefaultLinkCollector.java:79) ~[spring-data-rest-webmvc-3.6.0.jar:3.6.0]
	at org.springframework.data.rest.webmvc.json.PersistentEntityJackson2Module$ProjectionSerializer.toModel(PersistentEntityJackson2Module.java:728) ~[spring-data-rest-webmvc-3.6.0.jar:3.6.0]
	at org.springframework.data.rest.webmvc.json.PersistentEntityJackson2Module$ProjectionSerializer.serialize(PersistentEntityJackson2Module.java:693) ~[spring-data-rest-webmvc-3.6.0.jar:3.6.0]
	at org.springframework.data.rest.webmvc.json.PersistentEntityJackson2Module$ProjectionSerializer.serialize(PersistentEntityJackson2Module.java:650) ~[spring-data-rest-webmvc-3.6.0.jar:3.6.0]
	at com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:728) ~[jackson-databind-2.13.1.jar:2.13.1]
	at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:774) ~[jackson-databind-2.13.1.jar:2.13.1]
	... 123 common frames omitted

[darioseidl]

I'm getting the same exception after upgrading to Spring Boot 2.6+, presumably because in 2.6.0 there was an upgrade to Spring Data 2021.1.0.

[mp911de]

We've fixed the issue in Spring Data JPA with spring-projects/spring-data-jpa#2383 but the fix isn't released yet. Can you test against 2.6.1 snapshots of Spring Data JPA?

[godzzo]

We've fixed the issue in Spring Data JPA with spring-projects/spring-data-jpa#2383 but the fix isn't released yet. Can you test against 2.6.1 snapshots of Spring Data JPA?

I have tested the snapshot, works fine. Thank You!

[joao-borges]

Hello @mp911de I am having this problem and I am on spring-data-jpa 2.6.3. Maybe it's a different flavor of the same issue?

See

Caused by: org.springframework.data.mapping.MappingException: Cannot get or create PersistentEntity for type c.m.m.s.m.User$HibernateProxy$giIeFBAb! PersistentEntities knows about 3 MappingContext instances and therefore cannot identify a single responsible one. Please configure the initialEntitySet through an entity scan using the base package in your configuration to pre initialize contexts.
	at org.springframework.data.mapping.context.PersistentEntities.lambda$getRequiredPersistentEntity$0(PersistentEntities.java:119)
	at java.base/java.util.Optional.orElseThrow(Optional.java:408)
	at org.springframework.data.mapping.context.PersistentEntities.getRequiredPersistentEntity(PersistentEntities.java:118)
	at org.springframework.data.rest.core.support.DefaultSelfLinkProvider.entityIdentifierOrNull(DefaultSelfLinkProvider.java:120)
	at org.springframework.data.rest.core.support.DefaultSelfLinkProvider.getResourceId(DefaultSelfLinkProvider.java:109)
	at org.springframework.data.rest.core.support.DefaultSelfLinkProvider.createSelfLinkFor(DefaultSelfLinkProvider.java:84)
	at org.springframework.data.rest.core.support.DefaultSelfLinkProvider.createSelfLinkFor(DefaultSelfLinkProvider.java:74)
	at org.springframework.data.rest.webmvc.mapping.DefaultLinkCollector.lambda$createSelfLink$1(DefaultLinkCollector.java:129)
	at java.base/java.util.Optional.orElseGet(Optional.java:369)
	at org.springframework.data.rest.webmvc.mapping.DefaultLinkCollector.createSelfLink(DefaultLinkCollector.java:129)
	at org.springframework.data.rest.webmvc.mapping.DefaultLinkCollector.getLinksFor(DefaultLinkCollector.java:95)
	at org.springframework.data.rest.webmvc.mapping.DefaultLinkCollector.getLinksFor(DefaultLinkCollector.java:79)
	at org.springframework.data.rest.webmvc.json.PersistentEntityJackson2Module$ProjectionSerializer.toModel(PersistentEntityJackson2Module.java:728)
	at org.springframework.data.rest.webmvc.json.PersistentEntityJackson2Module$ProjectionSerializer.serialize(PersistentEntityJackson2Module.java:693)
	at org.springframework.data.rest.webmvc.json.PersistentEntityJackson2Module$ProjectionSerializer.serialize(PersistentEntityJackson2Module.java:650)
	at com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:728)
	at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:774)
	... 149 common frames omitted

In this case I am using a request to get UserGroups, which has a collection of lazy initialized users.
(much stuff suppressed for easier view)

class UserGroup {
   @ManyToMany(fetch = FetchType.LAZY)
    @JoinTable(name = "group_user",
        joinColumns = @JoinColumn(name = "group_id", referencedColumnName = "id"),
        inverseJoinColumns = @JoinColumn(name = "user_id", referencedColumnName = "id"))
    private Set<User> users;
}

And the response is intended to have something like this

{
   {
     group: x
     users: [
       {
         name: x
       },
       {
         name: y
       }
     ]
   }
}

The response serialization is failing.

I've been debugging the fix that was added to 2.6.1 and I don't see anywhere going into that method thad was changed.

Can you please advise? We are trying to bump from spring boot 2.5.5 to 2.6.6 due to the recent CVE.

Thank you

Joao
[email protected]