Hi all! I have a question regarding `Exceptions in...

# multiplatform

[juancho]

Hi all! I have a question regarding Exceptions in Multiplatform (for the JVM target).
I have a multiplatform lib with a method that can throw a custom exception. In Java code I’m using that method surrounded with a try/catch. I was expecting that custom exception to arrive but it was not working. I just added another catch with a general Throwable exception, now it worked and also what got my attention is that it’s a RuntimeException where the cause has my CustomException, so I can access it from there but it’s kind of annoying. Does anyone know how to improve this?
So it looks like this:

try {
            return mppApi.getSomethingWithExceptionInMultiplatform();
        } catch (MyCustomException e) {
            // never gets here...
        } catch (Throwable e) {
            if (e.getCause() instanceof MyCustomException) {
                // here I can access my custom exception fields with
                // ((MyCustomException) e.getCause())
            }
            throw e;
        }

[josephivie]

It looks like your custom exception is getting caught, wrapped in another exception as its cause, and then thrown.

[juancho]

Exactly and I don't know if there is a way to make it works as we normally would use it

[natpryce]

The multiplatform-ness of the project shouldn’t, itself, cause the the exception to be wrapped. E.g. I’ve ported a Gradle build from JVM only to multiplatform on JVM, JS and native, and did not encounter any changes to the way exceptions are caught or thrown.

[natpryce]

So maybe something else is wrapping it — a DI container or compiler plugin perhaps

[juancho]

Thanks man! yes it was a proxy that was wrapping the exception. Really thanks for the great input 🙇‍♂️