Thanks Blahblah for the good answer and also for the quote of the author's message.
jedit.org is well-known for using bsh for almost everything - you can even use bsh expressions in the search-and-replace dialog box IIRC.
How true - Jedit uses it. That's a nice program.
My only bad experience has been when using an app that came with bsh bundled in it's download, and it bundled an old version that conflicted with the one I had already installed in my VM. The VM-installed version took priority, and the app wouldn't run because some of the API had changed between versions.
Oh yes, that's the same if you install Xith3d or Jogl in your JVM and download apps which bundle newer versions of them: conflict with your installed "old" version (or the other way round).
Possible to avoid.
OK, so Beanshell is a bit sleeping but live and kicking. Very good news. Thanks again.