Invalid hibernate proxy entity id

When trying to delete an entity, nothing happens because spring is accessing the id directly, and because it is a hibernate proxy object, the member has default 0 value, thus it thinks it is a new entity and skips altogether the delete.

From debugging, this is the relevant part of the callstack:

getField:674, ReflectionUtils (org.springframework.util)
getPropertyValue:63, DirectFieldAccessFallbackBeanWrapper (org.springframework.data.util)
getId:154, JpaMetamodelEntityInformation (org.springframework.data.jpa.repository.support)
isNew:42, AbstractEntityInformation (org.springframework.data.repository.core.support)
isNew:233, JpaMetamodelEntityInformation (org.springframework.data.jpa.repository.support)
delete:170, SimpleJpaRepository (org.springframework.data.jpa.repository.support)

At the top, in ReflectionUtils::getField(Field,Object) method, the target variable is of type class package.Class$HibernateProxy$HWnaDQWN, and field is private int package.Class.id.

Note that accessing the id by method target.getId() returns non-zero id, as expected.

The id is defined inside the entity as follows:

    @Id @GeneratedValue(strategy = GenerationType.IDENTITY)
    private int id;

Spring Boot 2.1.6.RELEASE

• Spring-core 5.1.8.RELEASE
• Hibernate-core 5.3.10.Final
• Spring-data-commons 2.1.9.RELEASE
• Spring-data-jpa 2.1.9.RELEASE

[cdalexndr]

Opened https://jira.spring.io/browse/DATAJPA-1576

[mp911de]

We should move that ticket to JIRA, here’s probably not the right place. I think we can improve on that end to align with JPA access rules and fetch the Id value in a better way.