Source code needed for org.j3d.util.I18nManager and org.j3d.io.EndianConverter

My code uses the old STLFileReader and I see it's not supported. I've imported the source code for it but it relies on

org.j3d.util.I18nManager
org.j3d.io.EndianConverter

Which I can't find source for. Any ideas? Thanks in advance.

It's OK. I managed to find EndianConverter by decompiling a class file and got a version of STLFile reader that didn't use I18nManager  :-)