publish and escape problem in Java

SafeListener

package com.ado.java;

class Event {
    public Event() {
    }
}

abstract class EventListener {
    public abstract void onEvent(Event event);
}

class EventSource {
    public void registerListener(EventListener listener) {
        // Stuff
    }
}

/**
 * Register event listener or Start new thread safely in
 * the constructor
 */
public class SafeListener {

    private final EventListener listener;

    private void doSomething() {

    }

    private SafeListener() {
        listener = new EventListener() {
            public void onEvent(Event e) {
                doSomething();
            }
        };
    }

    public static SafeListener newInstance(EventSource source) {
        SafeListener safeListener = new SafeListener();
        source.registerListener(safeListener.listener);
        return safeListener;
    }
}