The Rhino Scripting Engine from Mozilla is an open-source implementation of JavaScript written entirely in Java. It gives us serverside javascript in Java applications. Innovation Gate integreated Rhino in its Content Management System WebGate AnyWhere.

The new Rhino version (integrated in WebGate Anywhere 3.2) supports E4X, which is a very cool way to handle XML in javascript.

Some examples:

// Use an XML literal to create an XML object
var order = <order>
    <customer>
       <firstname>John</firstname>
       <lastname>Doe</lastname>
    </customer>
    <item>
       <description>Big Screen Television</description>
       <price>1299.99</price>
       <quantity>1</quantity>
    </item>
</order>
var name = order.customer.firstname + " " + order.customer.lastname;

// construct a new XML object using expando and super-expando properties
var order = <order/>;
order.customer.name = "Fred Jones";
order.customer.address.street = "123 Long Lang";
order.customer.address.city = "Underwood";
order.customer.address.state = "CA";
order.item[0] = "";
order.item[0].description = "Small Rodents";
order.item[0].quantity = 10;
order.item[0].price = 6.95;

Find more examples here.