Main.java

package doubetrouble;

import java.util.concurrent.Callable;

public class Main implements Callable<Object> {

    private static class Constants {
        final static Object constant;

        static {
            System.err.println("Lazy cosntants init");
            constant = new Object();
        }
    }

    static {
        System.err.println("Main init");
    }

    public static void main(String[] args) {
        try {
            new Main().call();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public Object call() throws Exception {
        System.err.println("Main call");
        return Constants.constant;
    }
}