Java APIs for Nashorn - Scripting in Java: Integrating with Groovy and JavaScript - page 316

Listing 12-1. Using Multiple Script Globals Per Nashron Engine
// MultiGlobals.java
package com.jdojo.script;
import javax.script.ScriptContext;
import javax.script.ScriptEngine;
import javax.script.ScriptEngineManager;
import javax.script.SimpleScriptContext;
public class MultiGlobals {
public static void main(String[] args) {
// Get the Nashorn script engine
ScriptEngineManager manager = new ScriptEngineManager();
ScriptEngine engine = manager.getEngineByName("JavaScript");
try {
// Add a variable named msg to the script globals
engine.eval("var msg = 'Hello globals'");
// Print the value of the msg variable
engine.eval("print(this.msg);");
// Execute the same script as above, but using a new
// ScriptContext object. The engine will use a fresh
// copy of the globals and will not find this.msg that
// was created and associated with the default script
// context of the engine previously.
ScriptContext ctx = new SimpleScriptContext();
engine.eval("print(this.msg);", ctx);
}
catch (Exception e) {
e.printStackTrace();
}
}
}
Hello globals
undefined