Spent a whole day on the error "Class A cannot be cast to Class A" when trying to access

@Cacheable

method return value when it clearly should be working since I literally just put the same class instance into the cache when I called the method for the first time 1 second ago... Couldn't find a single article that helped me on the issue.

mvn clean

didn't help either. ... It worked after I invalidated intellij cache and restarted IDE. I love my life sometimes.

1. it’s not related to kotlin 2. it probably doesn’t belong to general 3. it’s probably related to a class loading issue. two classes are not the same if they are loaded by two different class loaders