How to use org. Org in Java apache. commons. Lang namespace?

I tried using org. Org in eclipse apache. commons. Lang. notimplementedexception, although you can see from IntelliSense and package explorer that the namespace does not exist

So I think I have to load some other packages (you call them libraries in Java) than loading them by default

This is my current setting: (link dead)

Solution

You need to add the Apache commons jar file to the project You can choose the jar you want from here – http://commons.apache.org/downloads/index.html For Lang, you need this – commons-lang-2.5 jar