Layered ClassLoader issues

[lordofthejars]

Hi, I opened an issue in the Quarkus project about one problem I faced during the serialization process, and it seems that the problem is widely extended to any project that can use a layered ClassLoader (quarkusio/quarkus#43111 (comment))

I know that reworking this might be complicated here, but it is an issue that might be raised in the future.

[bsorrentino]

Hi @lordofthejars thanks for feedback

Do you know if also library (like Jackson) had the same problem ?

[lordofthejars]

The problem is in the serialization library. In Jackson, this should not be the problem.

What I was thinking is, why force that? For memory, I understand you need to clone the object to protect objects from external modification, but maybe you could use a copy-deep feature like https://commons.apache.org/proper/commons-beanutils/.

For memory saver, it is memory after all, so you can store the object itself. And then, for any other implementations, you can leave it to implementations to do it without forcing them to use any framework.

Maybe I am missing something, but maybe this would be the most agnostic way without classloader issues.

[bsorrentino]

Hi @lordofthejars thanks for valuable feedback

Serialization seemed to me the best way to both clone and persist data ( also on file system ).

However I've implemented the Serializer outer the standard serialisation mechanism and the instantiation is explicit (not using the lookup in classoladers). This approach requires bit of code but is safe and controlled. I'm adding the possibility to serialise in different format (eg. Json) using third-party library.

Deep-Copy could be an interesting alternative just in case

[lordofthejars]

Hi, any ideas about this? I face this problem, especially when running tests in Quarkus, because of classloader issues. I am not sure if this issue will impact other frameworks.

[bsorrentino]

Hi @lordofthejars

Are you using last version ? Could you share more infos ? (eg. Stacktrace )

Anyway I'm making serialisation strategy customisable ( ref. last SNAPSHOT )