'Overridden library java class fails during release build with r8

Currently I'm using library. Assume it's called com.example. And it has a file com.example.File.java which I have overridden by creating my own File.java under same path of com.example in my app project. It works as expected with debug builds, where I successfully inject my own version of File.java. But when I try to build release using r8 I get error:

Type com.example.File$1 is defined multiple times: <...>

So I tried using android packaging options:

packagingOptions {
    exclude 'com/example/**'
}

In hopes of at least completely removing mentioned file (and all others in that path), but I still get same error. How to properly exclude file from packagingOptions or is this not the right place for that?

javaandroidgradle


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