Maven: getting NullPointerException when trying to insert into database - maven

Question

I created a server side Maven project called revison-ejb and Maven client project revison-ejb-client.
Database table is already created but I get NullPointerException when trying to insert into t_player table.
Any help would be appreciated!
revison-ejb
Player.java
package edu.foot.entities;
import java.io.Serializable;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Table;
/**
* Entity implementation class for Entity: Player
*
*/
#Entity
#Table(name = "t_player")
public class Player implements Serializable {
private int id;
private int age;
private String nom;
private static final long serialVersionUID = 1L;
public Player() {
super();
}
public Player(int age, String nom) {
super();
this.age = age;
this.nom = nom;
}
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public int getAge() {
return this.age;
}
public void setAge(int age) {
this.age = age;
}
public String getNom() {
return this.nom;
}
public void setNom(String nom) {
this.nom = nom;
}
#Override
public String toString() {
return "Player [id=" + id + ", age=" + age + ", nom=" + nom + "]";
}
}
PlayerServiceRemote.java
package edu.foot.interfaces;
import edu.foot.entities.Player;
public interface PlayerServiceRemote {
void add(Player player);
void update(Player player);
}
PlayerService
package edu.foot.interfaces.impl;
import javax.ejb.Stateless;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import edu.foot.entities.Player;
import edu.foot.interfaces.PlayerServiceRemote;
#Stateless
public class PlayerService implements PlayerServiceRemote {
#PersistenceContext
EntityManager em;
public void add(Player player) {
em.persist(player);
}
public void update(Player player) {
em.merge(player);
}
}
revison-ejb-client
package edu.esprit.irt.Player;
import javax.naming.InitialContext;
import edu.foot.entities.Player;
import edu.foot.interfaces.PlayerServiceRemote;
public class AddPlayer {
public static void main(String[] args) {
InitialContext ctx = null;
PlayerServiceRemote proxy = null;
String jndi = "revison-ejb/PlayerService!edu.foot.interfaces.PlayerServiceRemote";
try {
ctx = new InitialContext();
proxy = (PlayerServiceRemote) ctx.lookup(jndi);
} catch (Exception e) {
}
Player p1 = new Player(10, "Dirar");
proxy.add(p1);
}
}
the error
Exception in thread "main" java.lang.NullPointerException
at edu.esprit.irt.Player.AddPlayer.main(AddPlayer.java:25)

Answer 1

As you are invoking EJBs from outside of the container, you need to annotate your interface as
#Remote
public interface PlayerServiceRemote {
You can check information on when to use #Remote