Hello lovely Mockkers! In my test, this line wher...

# mockk

[Noah]

Hello lovely Mockkers!

In my test, this line where I mock a return from repository

every { repository.save(any()) } returns fleetEntity

Returns the following after switching JDK from Eclipse Temurin to docker.io/ibm-semeru-runtimes:open-17.0.13_11-jdk

FleetServiceTest > should return created fleet given request() FAILED
    io.mockk.MockKException at FleetServiceTest.kt:44
        Caused by: java.lang.ClassCastException at FleetServiceTest.kt:44

repository interface:

package org.springframework.data.repository;

import java.util.Optional;

@NoRepositoryBean
public interface CrudRepository<T, ID> extends Repository<T, ID> {
    <S extends T> S save(S entity);

    <S extends T> Iterable<S> saveAll(Iterable<S> entities);

    Optional<T> findById(ID id);

    boolean existsById(ID id);

    Iterable<T> findAll();

    Iterable<T> findAllById(Iterable<ID> ids);

    long count();

    void deleteById(ID id);

    void delete(T entity);

    void deleteAllById(Iterable<? extends ID> ids);

    void deleteAll(Iterable<? extends T> entities);

    void deleteAll();
}

Any ideas as to why this CastException occurs all of a sudden after changing the JDK? This is important because the new JDK image has a significantly smaller memory footprint.

[Daniel Pitts]

The problem is probably outside of the code you've shared. My first instinct would be to make sure the class-path is clean. Doing a full rebuild might help.

I'd also consider setting a breakpoint where that exception occurs and seeing what the actual type is before the cast. That may provide a clue.

[ephemient]

as I mentioned in the other thread, mockk may have some issues when running on IBM OpenJ9 that aren't on Oracle Hotspot: https://github.com/mockk/mockk/issues/726

[Noah]

I am trying to reproduce the error, so I changed my local JDK in IntelliJ but the test passes....???

[Daniel Pitts]

Yeah, sounds like an issue with the JDK itself.