Encoding problem with library sources

I am getting a strange from Scala compiler. My project code is using UFT-8 encoding. It uses GlazedList library JAR with pointer to library source code. I am getting errors like:

IO error while decoding (…)\glazedlists-1.8.0_java15\source\ca\odell\glazedlists\impl\filter\AbstractTextSearchStrategy.java with UTF-8

The file seems to be with windows-1252 encoding, it is are not in the source path of the project, the compiled GlazedList JAR is a dependency. Could it be a bug in Scala plugin? I am using v.0.4.637.