A lot of people are having compressor fail with an org.mozilla.javascript.EvaluatorException, and it appears that it is most commonly happening when the charset option is not provided and the file is
encoded in utf-8. If compressor is unable to detect the correct charset, an approach that might work is to catch that exception, retry the operation with utf-8 encoding, and if it fails again,
rethrow the original error with additional advice about providing the correct charset to the compressor.