I suspect Nashorn, the just released edition of JavaScript for the JVM, will be heavily promoted by Oracle and become heavily used for quick and dirties manipul

I suspect Nashorn, the just released edition of JavaScript for the JVM, will be heavily promoted by Oracle and become heavily used for quick and dirties manipulating and testing Java classes, putting a dent into use of Groovy and Xtend in Java shops. After all, people who learn and work in Java will want to learn JavaScript for the same sort of reasons.