Switching from Rhino to Nashorn

Question

I have a Java 7 project which makes a lot of use of Javascript for scripting various features. Until now I was using Rhino as script engine. I would now like to move to Java

Answer 1

One problem is that Nashorn can no longer by default import whole Java packages into the global scope by using importPackage(com.organization.project.package);

There is, however, a simple workaround: By adding this line to your script, you can enable the old behavior of Rhino:

load("nashorn:mozilla_compat.js");

Another problem I ran into is that certain type-conversions when passing data between java and javascript work differently. For example, the object which arrives when you pass a Javascript array to Java can no longer be cast to List, but it can be cast to a Map. As a workaround you can convert the Javascript array to a Java List in the Javascript code using Java.to(array, Java.type("java.util.List"))