ClassCastException: class sun.reflect.generics.reflectiveObjects.TypeVariableImpl cannot be cast to class java.lang.Class

[pergravgaard]

The stack trace error:

java.lang.ClassCastException: class sun.reflect.generics.reflectiveObjects.TypeVariableImpl cannot be cast to class java.lang.Class (sun.reflect.generics.reflectiveObjects.TypeVariableImpl and java.lang.Class are in module java.base of loader 'bootstrap')
    at io.hypersistence.optimizer.hibernate.scanner.Hibernate63MappingScanner$4.execute(Hibernate63MappingScanner.java:247) ~[hypersistence-optimizer-2.9.0-jakarta.jar:?]
    at io.hypersistence.optimizer.core.action.ActionExecutor.execute(ActionExecutor.java:68) ~[hypersistence-optimizer-2.9.0-jakarta.jar:?]
    at io.hypersistence.optimizer.hibernate.scanner.Hibernate63MappingScanner.scanBasicIdentifierGenerator(Hibernate63MappingScanner.java:203) ~[hypersistence-optimizer-2.9.0-jakarta.jar:?]
    at io.hypersistence.optimizer.hibernate.scanner.Hibernate63MappingScanner.scanEntityIdentifier(Hibernate63MappingScanner.java:188) ~[hypersistence-optimizer-2.9.0-jakarta.jar:?]

The method that is failing is scanCompositeIdentifierGenerator.

The problem seems to be caused by the following mapping:

@MappedSuperclass
public abstract class AbstractEntity<ID extends Serializable> implements Persistable<ID> {

    @Id
    @GeneratedValue(
            strategy = GenerationType.AUTO
    )
    @Column(nullable = false, unique = true, updatable = false)
    private ID id;
...
}

[vladmihalcea]

@pergravgaard I will need the entity mapping that triggers this issue. Since the scanCompositeIdentifierGenerator method failed, it means the entity mapping is using some composite identifier, which I will need in order to replicate the problem.

[pergravgaard]

Sorry, somehow I got confused by my IDE and copied the wrong method. The method causing the issue is actually scanBasicIdentifierGenerator.

I believe you can reproduce with an entity like this:

@Entity
public class Role extends AbstractEntity<Long> {
...
}

[vladmihalcea]

Fixed.

[pergravgaard]

Thank you very much. That' was quick.

:-) Per

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On Wednesday, 11 September 2024 at 7:23 PM, Vlad Mihalcea @.***> wrote:

Fixed.

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[vladmihalcea]

@pergravgaard You're welcome. Let me know if the 2.10.1 version fixes the problem.

[pergravgaard]

It does, already checked it. And if my memory is correct the issue wasn't there prior to version 2.8.x, but it could also be due to the fact that I upgraded my project to Spring Boot 3 and maybe another HibernateScanner class was used after that.

:-) Per

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On Thursday, 12 September 2024 at 10:04 AM, Vlad Mihalcea @.***> wrote:

@.***(https://github.com/pergravgaard) You're welcome. Let me know if the 2.10.1 version fixes the problem.

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