Procedures and Compiled Scripts - Scripting in Java: Integrating with Groovy and JavaScript - page 184

To execute a compiled script, you need to call one of the following eval() methods
of the CompiledScript class:
•

Object eval() throws ScriptException

•

Object eval(Bindings bindings) throws ScriptException

Object eval(ScriptContext context) throws ScriptException
The eval() method without any arguments uses the default script context of the
script engine to execute the compiled script. The other two versions work the same
as the eval() method of the ScriptEngine interface when you pass a Bindings or a
ScriptContext to them.

•

■ When you evaluate scripts using the eval() method of the CompiledScript class,
changes in the state of the engine made during the execution of the compiled script may be
visible in the subsequent execution of the scripts by the engine.

Tip

Listing 5-8 shows how to compile a script and execute it. It executes the same
compiled script twice with different parameters.

Listing 5-8. Using Compiled Scripts

// CompilableTest .java
package com.jdojo.script;

import javax.script.Bindings;
import javax.script.Compilable;
import javax.script.CompiledScript;
import javax.script.ScriptEngine;
import javax.script.ScriptEngineManager;
import javax.script.ScriptException;

public class CompilableTest {
public static void main(String[] args) {
// Get the Nashorn engine
ScriptEngineManager manager = new ScriptEngineManager();
ScriptEngine engine = manager.getEngineByName("JavaScript");

if (!(engine instanceof Compilable)) {
System.out.println(
"Script compilation not supported.");
return;
}