michaldo

"task-2@17221" prio=5 tid=0x21 nid=NA waiting for monitor entry
  java.lang.Thread.State: BLOCKED
	 waiting for main@1 to release lock on <0x434b> (a java.util.concurrent.ConcurrentHashMap)
	  at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:186)
	  at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:168)
	  at org.springframework.context.event.AbstractApplicationEventMulticaster.retrieveApplicationListeners(AbstractApplicationEventMulticaster.java:264)
	  at org.springframework.context.event.AbstractApplicationEventMulticaster.getApplicationListeners(AbstractApplicationEventMulticaster.java:204)
	  at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:134)
	  at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:404)
	  at org.springframework.c

michaldo

import java.util.ArrayList;
import java.util.List;

public class OldCheckpoints {
	
	private boolean completed = false;
	
	private List<Point> chechpoints = new ArrayList<>();
	
	private Point first;

michaldo

class Point {

	final int x;
	final int y;

	public Point(int x, int y) {
		this.x = x;
		this.y = y;
	}