Hi there, I don't get why sout2 must be synchronized if it's called by sout which is already synchronized. If sout it's synchronized it means, according to my very limited knowledge, that if sout is taken it cannot be taken again because of MUTEX so sout2 neither. Thanks 
package com.codegym.task.task27.task2704;

/*
Modifiers and deadlock

*/

public class Solution {
    private final String field;

    public Solution(String field) {
        this.field = field;
    }

    public String getField() {
        return field;
    }

    public synchronized void sout(Solution solution) {
        System.out.format("111:  %s: %s %n", this.field, solution.getField());
        solution.sout2(this);
    }

    public synchronized void sout2(Solution solution) {
        System.out.format("222:  %s: %s %n", this.field, solution.getField());
        solution.sout(this);
    }

    public static void main(String[] args) {
        final Solution solution = new Solution("first");
        final Solution solution2 = new Solution("second");
        new Thread(new Runnable() {
            public void run() {
                solution.sout(solution2);
            }
        }).start();

        new Thread(new Runnable() {
            public void run() {
                solution2.sout(solution);
            }
        }).start();

    }
}