[BUG] EnumResolver produces NullPointerException

[robinwersich]

Describe the bug
When building my project, I currently get the following exception:

 java.lang.NullPointerException
        at tech.mappie.ir.resolving.enums.EnumResolver.resolve(EnumResolver.kt:23)
        at tech.mappie.ir.resolving.ResolvingStage.execute(ResolvingStage.kt:23)
        at tech.mappie.ir.generation.classes.ClassMappieCodeGenerationModelFactory.generate(ClassMappieCodeGenerationModelFactory.kt:61)

To Reproduce
Unfortunately I was not yet able to find out what exactly causes this exception - but I see that the !! operator is used in the EnumResolver, so this should probably change

Expected behavior
A more descriptive error message that points me to why the mapping is failing (e.g. showing me at least for which enum the mapping is failing)

Kotlin version
The version of kotlin used.

Mappie version
2.2.21-2.1.1

Invocation method
Gradle

[stefankoppier]

Hi @robinwersich, thanks for report. I guessed any type for which a class couldn't be found wouldn't reach this point. I suspect a generic. But whatever it may be, I agree that using !! isn't the best idea here. I will change this to a more concrete compiler error which hopefully helps.

When this is released and you still have this issue, I would love to know what mapper and target type is causing the issue so I might be able to create a fix instead of a better error message.

[robinwersich]

@stefankoppier I've checked with the new version, and the error message I now get is

tech.mappie.exceptions.MappieProblemException: Failed to resolve class for target type A
        at tech.mappie.exceptions.MappieProblemException$Companion.fail(MappieExceptions.kt:24)
        at tech.mappie.ir.resolving.enums.EnumResolver.resolve(EnumResolver.kt:30)
        at tech.mappie.ir.resolving.ResolvingStage.execute(ResolvingStage.kt:23)

[stefankoppier]

That gives a hint for the problematic mapper. It's the one with type parameter A as a target.

[robinwersich]

Problem is I don't think we have a class that's just called A in our code base... I was thinking that maybe it refers to a generic type parameter, but couldn't find something like Foo<A> either...
I'll continue investigating