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So after loosing precious 6 hours. This is how it is solved. Subscriber was added like this:

ros::Subscriber sub4 = nh.subscribe<geometry_msgs::Point>("/y", 1, boost::bind(&a_server::callback2, this, _1));

Callback function was written like this:

void a_server::callback2(const geometry_msgs::Point::ConstPtr& a)
{
    ....
}

Header file was added with this under Public:

void callback2(const geometry_msgs::Point::ConstPtr& a);