java - Debugging methods in Scala library from Eclipse - Stack Overflow
Well, it's gonna be quite non-trivial if you don't install the Scala plugin for Eclipse, you can find it here:
Scala is compiled for the JVM so you will be able to debug it without the plugin. Theoretically. The practical issue is that the class file contains tons of generated stuff which can be extremely hard to understand (even for guys who're pro how Scala translates its concepts, e.g., anonymous functions into bytecode).
Just an example: you'll have to deal with monsters like scala.some.Class$$anon$1$$anonfun$someFunction$1$2$$anonfun$apply$2.apply. It is far-far easier if you install the plugin and see something like c -> c.somefunction( println(e)).
So try to find out which version of Scala was used for your dependency, install the required Scala IDE for that Scala version, attach the source and you'll be able to debug.
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