ScriptValidator validate java object with javascript

ScriptValidator.java

import java.util.function.Predicate;

import javax.script.Invocable;
import javax.script.ScriptEngine;
import javax.script.ScriptEngineManager;
import javax.script.ScriptException;

public class ScriptValidator implements Predicate<Object> {
	private final ScriptEngine engine;
	private final String functionName;

	private ScriptValidator(String script, String functionName) {
		this.engine = new ScriptEngineManager().getEngineByName("nashorn");
		this.functionName = functionName;
	}

	public static ScriptValidator of(String script, String functionName) throws ScriptException {
		ScriptValidator scriptValidator = new ScriptValidator(script, functionName);
		scriptValidator.engine.eval(script);
		return scriptValidator;
	}

	@Override
	public boolean test(Object o) {
		Invocable invocable = (Invocable) engine;
		try {
			return (boolean) invocable.invokeFunction(functionName, o);
		} catch (NoSuchMethodException | ScriptException e) {
			return false;
		}
	}

}

Test.java

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Random;

import javax.script.ScriptException;

public class Test {

	public static void main(String[] args) throws ScriptException, NoSuchMethodException {
		String validation = "function validate(m){return m.value.length>0}";
		ScriptValidator validator = ScriptValidator.of(validation, "validate");
		List<Map<String, Object>> list = new ArrayList<>();
		Random r = new Random();
		for (int i = 0; i < 1000; i++) {
			Map<String, Object> m = new HashMap<>();
			if (r.nextBoolean())
				m.put("value", "Hello");
			list.add(m);
		}
		list.stream().filter(validator).forEach(System.out::println);

	}

}