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the jjs RPEL in nashorn

 
Jeanne Boyarsky
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I'm doing the exercises to Cay Horstmann's Java SE 8 for the Really Impatient. After doing the first two I realize that I hate the jjs RPEL command line. I've used RPELs (read evaluate print loop) in other programming languages and I don't have this reaction.

I blogged about why I dislike it and how many attempts it took me to write a simple four line program. Has anyone had a more positive experience they could share?

Part of the problem is that I'm having trouble imagining a use case for integrating Java and JavaScript. I wouldn't want the users running custom code in the JVM of any of my applications (security issue). The RPEL is far more difficult than testing something quickly in an IDE and somewhat slower than a text file that I compile repeatedly.
 
It is sorta covered in the JavaRanch Style Guide.
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