We could add a bunch of classes:

```scala
class JLong2String extends Bijection[JLong, String @@ Rep[Long]] {
  // ...
}
```
But that is a ton of work, and in the mean time, I think we should at least add these java tests.  You can add a todo, but honestly, this is pretty low on the priority list.

People interoping Java with scala should be used to the object syntax by now (which is always X$.MODULE$).