Issue with reading sensor_msgs

edit

Hello every one, since, i want to read messages from the topic /cartesian/solution which has sensor_msgs and want to then some random topic /panda/pand. For confirmation, i am also printing out one member of topic /cartesian/solution But all the time its showing me zero. It means my callback function is not updating the values to one declared in public class. Because all the time it is showing me zeros for all of these values, which are their inherent assignments. I want to read these from this topic but unable to do it.

Updated Code

using namespace std;

class server {
public:

  std_msgs::Float64 joint_position0, joint_position1, joint_position2, joint_position3, joint_position4, joint_position5, joint_position6, joint_position7, joint_position8, joint_position9, joint_position10, joint_position11, joint_velocity0, joint_velocity1, joint_velocity2, joint_velocity3, joint_velocity4, joint_velocity5, joint_velocity6, joint_velocity7, joint_velocity8, joint_velocity9, joint_velocity10, joint_velocity11;


  void jointStateCallback(const sensor_msgs::JointState::ConstPtr& msg);
}




void server::jointStateCallback(const sensor_msgs::JointState::ConstPtr& msg) {

  joint_position0.data = msg->position[0];
  joint_position1.data = msg->position[1];
  joint_position2.data = msg->position[2];
  joint_position3.data = msg->position[3];
  joint_position4.data = msg->position[4];
  joint_position5.data = msg->position[5];
  joint_position6.data = msg->position[6];
  joint_position7.data = msg->position[7];
  joint_position8.data = msg->position[8];
  joint_position9.data = msg->position[9];
  joint_position10.data = msg->position[10];
  joint_position11.data = msg->position[11];
  joint_velocity0.data = msg->velocity[0];
  joint_velocity1.data = msg->velocity[1];
  joint_velocity2.data =msg->velocity[2];
  joint_velocity3.data = msg->velocity[3];
  joint_velocity4.data = msg->velocity[4];
  joint_velocity5.data = msg->velocity[5];
  joint_velocity6.data = msg->velocity[6];
  joint_velocity7.data = msg->velocity[7];
  joint_velocity8.data = msg->velocity[8];
  joint_velocity9.data = msg->velocity[9];
  joint_velocity10.data = msg->velocity[10];
  joint_velocity11.data = msg->velocity[11];

}

int main(int argc, char** argv) { 
  server objserver;
  ros::init(argc, argv, "mover_node");
  ros::NodeHandle n;
  //ros::AsyncSpinner spinner(1);
  //spinner.start();

  //bool success;

  ros::Subscriber joint_sub = n.subscribe("/catersian/solution", 100, &server::jointStateCallback, &objserver);



while (ros::ok())
   {

  ros::spinOnce();

  cout << objserver.joint_position8.data;
  cout<<"\n";
   }


    return(0);
}