try {
	ScriptEngineManager factory = new ScriptEngineManager();
	ScriptEngine engine = factory.getEngineByName("JavaScript");
 
	//Simple call to println javascript function 
	engine.eval("println('Texto JavaScript')");
 
} catch (ScriptException ex) {
 
	//Do something
}

try {
 
	ScriptEngineManager factory = new ScriptEngineManager();
	ScriptEngine engine = factory.getEngineByName("JavaScript");
	engine.eval("function amessagefunction(atext){ return 'The secret message is ' + atext;}");
	Invocable invocable = (Invocable) engine;
	Object object = invocable.invokeFunction("amessagefunction", "abc");
	System.out.println(object);
 
} catch (NoSuchMethodException ex) {
 
	//Do something
 
} catch (ScriptException ex) {
 
	//Something is wrong, perhaps
}