rough code as i am experimenting:
```
 private ScriptEngine configureScriptEngine() {
        System.setProperty("org.jruby.embed.localcontext.scope", "threadsafe");
        System.setProperty("org.jruby.embed.localvariable.behavior", "transient");
        ScriptEngine engine = factory.getScriptEngine();

        try {
            String environment = "ENV['RUBYLIB']='/Users/boc@us.ibm.com/personal/src/openhab-scripting/tmp/openhab/conf/automation/lib/ruby/lib'\n"
                    + "ENV['GEM_HOME']='/Users/boc@us.ibm.com/personal/src/openhab-scripting/tmp/openhab/conf/automation/lib/ruby/gem_home'";
            logger.error("Environment being set: {}", environment);
            engine.eval(environment);
        } catch (ScriptException e) {
            logger.error("Error setting environment", e);
        }
        return engine;
    }
```