Is this project still alive?

I'm reviving an old android app, that relies on this library, but keep getting the following message:
```
..\android-app\app\libs\JTransforms-3.1-with-dependencies.jar: D8: Type `sun.misc.Cleaner` was not found, it is required for default or static interface methods desugaring
```

* Any updates to more recent builds? 
* Are there any good alternatives to this?