Java/EJB3/Stateful Session Bean

EJB Tutorial from JBoss: stateful session bean

File: ShoppingCart.java
/*
 * JBoss, Home of Professional Open Source.
 * Copyright 2006, Red Hat Middleware LLC, and individual contributors
 * as indicated by the @author tags. See the copyright.txt file in the
 * distribution for a full listing of individual contributors.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */
package org.jboss.tutorial.stateful.bean;
import java.util.HashMap;
import javax.ejb.Remove;
public interface ShoppingCart
{
   void buy(String product, int quantity);
   HashMap<String, Integer> getCartContents();
   @Remove void checkout();
}

File: ShoppingCartBean.java
/*
 * JBoss, Home of Professional Open Source.
 * Copyright 2006, Red Hat Middleware LLC, and individual contributors
 * as indicated by the @author tags. See the copyright.txt file in the
 * distribution for a full listing of individual contributors.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */
package org.jboss.tutorial.stateful.bean;
import java.io.Serializable;
import java.util.HashMap;
import javax.ejb.Remove;
import javax.ejb.Stateful;
import javax.ejb.Remote;

@Stateful
@Remote(ShoppingCart.class)
public class ShoppingCartBean implements ShoppingCart, Serializable
{
   private HashMap<String, Integer> cart = new HashMap<String, Integer>();
   public void buy(String product, int quantity)
   {
      if (cart.containsKey(product))
      {
         int currq = cart.get(product);
         currq += quantity;
         cart.put(product, currq);
      }
      else
      {
         cart.put(product, quantity);
      }
   }
   public HashMap<String, Integer> getCartContents()
   {
      return cart;
   }
   @Remove
   public void checkout()
   {
      System.out.println("To be implemented");
   }
}
File: Client.java
/*
 * JBoss, Home of Professional Open Source.
 * Copyright 2006, Red Hat Middleware LLC, and individual contributors
 * as indicated by the @author tags. See the copyright.txt file in the
 * distribution for a full listing of individual contributors.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */
package org.jboss.tutorial.stateful.client;

import java.util.HashMap;
import javax.naming.InitialContext;
import org.jboss.tutorial.stateful.bean.ShoppingCart;
/**
 * Comment
 *
 * @author 



== EJB Tutorial from JBoss: stateful session bean deployment descriptor ==






   
  <!-- start source code -->
   
    <source lang="java">
File: jboss.xml
<?xml version="1.0"?>
<jboss
        xmlns="http://java.sun.ru/xml/ns/javaee"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:schemaLocation="http://java.sun.ru/xml/ns/javaee
                            http://www.jboss.org/j2ee/schema/jboss_5_0.xsd"
        version="3.0">
   <enterprise-beans>
      <session>
         <ejb-name>ShoppingCart</ejb-name>
         <jndi-name>org.jboss.tutorial.stateful_deployment_descriptor.bean.ShoppingCart</jndi-name>
      </session>
   </enterprise-beans>
</jboss>

File: ejb-jar.xml
<?xml version="1.0" encoding="UTF-8"?>
<ejb-jar
        xmlns="http://java.sun.ru/xml/ns/javaee"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:schemaLocation="http://java.sun.ru/xml/ns/javaee
                            http://java.sun.ru/xml/ns/javaee/ejb-jar_3_0.xsd"
        version="3.0">
   <description>JBoss Stateful Session Bean Tutorial</description>
   <display-name>JBoss Stateful Session Bean Tutorial</display-name>
   <enterprise-beans>
      <session>
         <ejb-name>ShoppingCart</ejb-name>
         <remote>org.jboss.tutorial.stateful_deployment_descriptor.bean.ShoppingCart</remote>
         <ejb-class>org.jboss.tutorial.stateful_deployment_descriptor.bean.ShoppingCartBean</ejb-class>
         <session-type>Stateful</session-type>
         <remove-method>
            <bean-method>
               <method-name>checkout</method-name>
            </bean-method>
            <retain-if-exception>false</retain-if-exception>
         </remove-method>
         <transaction-type>Container</transaction-type>
      </session>
   </enterprise-beans>
</ejb-jar>

Ejb With Generic Method

File: Employee.java

import javax.persistence.Entity;
import javax.persistence.EntityListeners;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.PostRemove;
@Entity
public class Employee implements java.io.Serializable {
  private int id;
  private String firstName;
  private String lastName;
  @Id
  @GeneratedValue
  public int getId() {
    return id;
  }

  @PostRemove
  public void postRemove()
  {
     System.out.println("@PostRemove");
  }
  public void setId(int id) {
    this.id = id;
  }
  public String getFirstName() {
    return firstName;
  }
  public void setFirstName(String first) {
    this.firstName = first;
  }
  public String getLastName() {
    return lastName;
  }
  public void setLastName(String last) {
    this.lastName = last;
  }
}

File: EmployeeBean.java

import javax.annotation.Resource;
import javax.ejb.Stateful;
import javax.ejb.TransactionManagement;
import javax.ejb.TransactionManagementType;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import javax.persistence.PersistenceContextType;
import javax.transaction.UserTransaction;
@Stateful
@TransactionManagement(TransactionManagementType.BEAN)
public class EmployeeBean implements EmployeeServiceLocal, EmployeeServiceRemote {
  @PersistenceContext(unitName = "EmployeeService", type = PersistenceContextType.EXTENDED)
  private EntityManager em;
  @Resource
  private UserTransaction ut;
  
  public EmployeeBean() {
  }

  public void doAction() {
    Employee emp = new Employee();
    emp.setFirstName("first");
    em.persist(emp);
  }
  public <T> T mergeEntity(T entity) {
    return em.merge(entity);
  }
  public <T> T persistEntity(T entity) {
    em.persist(entity);
    return entity;
  }
  public <T> T refreshEntity(T entity) {
    em.refresh(entity);
    return entity;
  }
  public void removeEntity(Object entity) {
    em.remove(em.merge(entity));
  }
  public void beginTrans()
    throws Exception {
    ut.begin();
  }
  public void commitTrans()
    throws Exception {
    ut.rumit();
  }
  public void rollbackTrans()
    throws Exception {
    ut.rollback();
  }
}

File: EmployeeServiceLocal.java

import javax.ejb.Local;
@Local
public interface EmployeeServiceLocal {
  public void doAction();
  <T> T mergeEntity(T entity);
  <T> T persistEntity(T entity);
  <T> T refreshEntity(T entity);
  void removeEntity(Object entity);
  void beginTrans() throws Exception;
  void commitTrans() throws Exception;
  void rollbackTrans() throws Exception;
}

File: EmployeeServiceRemote.java
import javax.ejb.Remote;

@Remote
public interface EmployeeServiceRemote {
  public void doAction();
  <T> T mergeEntity(T entity);
  <T> T persistEntity(T entity);
  <T> T refreshEntity(T entity);
  void removeEntity(Object entity);
  void beginTrans() throws Exception;
  void commitTrans() throws Exception;
  void rollbackTrans() throws Exception;
}

File: jndi.properties
java.naming.factory.initial=org.jnp.interfaces.NamingContextFactory
java.naming.factory.url.pkgs=org.jboss.naming:org.jnp.interfaces
java.naming.provider.url=localhost:1099

File: Main.java
import javax.naming.InitialContext;

public class Main {
  public static void main(String[] a) throws Exception {
    EmployeeServiceRemote service = null;
    // Context compEnv = (Context) new InitialContext().lookup("java:comp/env");
    // service = (HelloService)new
    // InitialContext().lookup("java:comp/env/ejb/HelloService");
    service = (EmployeeServiceRemote) new InitialContext().lookup("EmployeeBean/remote");
    service.beginTrans();
    service.doAction();
    service.rumitTrans();
  }
}

Remove Annotation

File: Employee.java
import static javax.persistence.FetchType.LAZY;
import java.io.Serializable;
import javax.persistence.Basic;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Lob;
import javax.persistence.Table;
@Entity
//@Table(name="EMP", schema="HR")
@Table(name="EMP")
public class Employee implements Serializable {
  @Id
  @Column(name = "EMP_ID")
  private int id;
  @Column(name = "COMM")
  private String name;
  @Column(name = "SAL")
  private long salary;
  
  public Employee() {
  }
  public Employee(int id) {
    this.id = id;
  }
  public int getId() {
    return id;
  }
  public void setId(int id) {
    this.id = id;
  }
  public String getName() {
    return name;
  }
  public void setName(String name) {
    this.name = name;
  }
  public long getSalary() {
    return salary;
  }
  public void setSalary(long salary) {
    this.salary = salary;
  }

  public String toString() {
    return "Employee id: " + getId() + " name: " + getName() + " salary: " + getSalary();
  }
}

File: EmployeeService.java

import java.util.Collection;
import javax.ejb.Remove;
import javax.ejb.Stateful;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import javax.persistence.PersistenceContextType;
import javax.persistence.Query;
@Stateful
public class EmployeeService implements EmployeeServiceLocal, EmployeeServiceRemote {
  @PersistenceContext(unitName="EmployeeService", type=PersistenceContextType.EXTENDED)
  EntityManager em;
  
  public EmployeeService() {
  }
  public Employee createEmployee(int id, String name, long salary, byte[] pic) {
    Employee emp = new Employee(id);
    emp.setName(name);
    emp.setSalary(salary);
    
    em.persist(emp);
    
    emp = findEmployee(id);
    System.out.println(emp);
    em.flush();
    return emp;
  }
  public void removeEmployee(int id) {
    Employee emp = findEmployee(id);
    if (emp != null) {
      em.remove(emp);
    }
  }
  public Employee raiseEmployeeSalary(int id, long raise) {
    Employee emp = em.find(Employee.class, id);
    if (emp != null) {
      emp.setSalary(emp.getSalary() + raise);
    }
    return emp;
  }
  public Employee findEmployee(int id) {
    return em.find(Employee.class, id);
  }
  public Collection<Employee> findAllEmployees() {
    Query query = em.createQuery("SELECT e FROM Employee e");
    return (Collection<Employee>) query.getResultList();
  }
  
  public void doAction(){
  }
  @Remove
  public void remove()
  {
    System.out.println("removed");
  }
}
    

File: EmployeeServiceLocal.java

import java.util.Collection;
import javax.ejb.Local;
@Local
public interface EmployeeServiceLocal {
    public void doAction();
    public Employee createEmployee(int id, String name, long salary, byte[] pic) ;
    public void removeEmployee(int id);
    public Employee raiseEmployeeSalary(int id, long raise) ;
    public Employee findEmployee(int id);
    public Collection<Employee> findAllEmployees() ;
}

File: EmployeeServiceRemote.java


import java.util.Collection;
import javax.ejb.Remote;
@Remote
public interface EmployeeServiceRemote{
  public void doAction();  
  public Employee createEmployee(int id, String name, long salary, byte[] pic) ;
  public void removeEmployee(int id);
  public Employee raiseEmployeeSalary(int id, long raise) ;
  public Employee findEmployee(int id);
  public Collection<Employee> findAllEmployees() ;  
}

File: jndi.properties
java.naming.factory.initial=org.jnp.interfaces.NamingContextFactory
java.naming.factory.url.pkgs=org.jboss.naming:org.jnp.interfaces
java.naming.provider.url=localhost:1099

File: Main.java
import java.util.Collection;
import javax.naming.InitialContext;
public class Main {
  public static void main(String[] a) throws Exception {
    EmployeeServiceRemote service = null;
    // Context compEnv = (Context) new InitialContext().lookup("java:comp/env");
    // service = (HelloService)new InitialContext().lookup("java:comp/env/ejb/HelloService");
    service = (EmployeeServiceRemote) new InitialContext().lookup("EmployeeService/remote");
    
    
    
    service.createEmployee(158, "AAA", 45000, "asdf".getBytes());
    service.createEmployee(159, "AAA", 45000, "asdf".getBytes());
    Employee emp = service.findEmployee(158);
    System.out.println(emp);
    
    Collection<Employee> list = service.findAllEmployees();
    
    System.out.println(list);
  }
}

Remove a Stateful Session Bean

File: Employee.java

import javax.persistence.Entity;
import javax.persistence.EntityListeners;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.PostRemove;

@Entity
public class Employee implements java.io.Serializable {
  private int id;
  private String firstName;
  private String lastName;
  @Id
  @GeneratedValue
  public int getId() {
    return id;
  }

  @PostRemove
  public void postRemove()
  {
     System.out.println("@PostRemove");
  }
  public void setId(int id) {
    this.id = id;
  }
  public String getFirstName() {
    return firstName;
  }
  public void setFirstName(String first) {
    this.firstName = first;
  }
  public String getLastName() {
    return lastName;
  }
  public void setLastName(String last) {
    this.lastName = last;
  }
}

File: EmployeeBean.java

import java.util.HashMap;
import java.util.Map;
import javax.ejb.Remove;
import javax.ejb.Stateful;

@Stateful
public class EmployeeBean implements EmployeeServiceLocal, EmployeeServiceRemote {

  public EmployeeBean() {
  }
  private HashMap<String,Integer> items = new HashMap<String,Integer>();
  public void addItem(String item, int quantity) {
      Integer orderQuantity = items.get(item);
      if (orderQuantity == null) {
          orderQuantity = 0;
      }
      orderQuantity += quantity;
      items.put(item, orderQuantity);
  }
  public void removeItem(String item, int quantity) {
      Integer orderQuantity = items.get(item);
      if (orderQuantity == null) {
          return;
      }
      orderQuantity -= quantity;
      if (orderQuantity > 0) {
          items.put(item, orderQuantity);         
      } else {
          items.remove(item);
      }
  }
  
  public Map<String, Integer> getItems() {
      return items;
  }
  @Remove
  public void checkout(int paymentId) {
    System.out.println("checkout");
  }
  @Remove
  public void cancel() {
  }

}

File: EmployeeServiceLocal.java
import java.util.Map;
import javax.ejb.Local;

@Local
public interface EmployeeServiceLocal {
  public void addItem(String id, int quantity);
  public void removeItem(String id, int quantity);
  public Map<String, Integer> getItems();
  public void checkout(int paymentId);
  public void cancel();
}

File: EmployeeServiceRemote.java


import java.util.Map;
import javax.ejb.Remote;

@Remote
public interface EmployeeServiceRemote {
  public void addItem(String id, int quantity);
  public void removeItem(String id, int quantity);
  public Map<String, Integer> getItems();
  public void checkout(int paymentId);
  public void cancel();
}

File: jndi.properties
java.naming.factory.initial=org.jnp.interfaces.NamingContextFactory
java.naming.factory.url.pkgs=org.jboss.naming:org.jnp.interfaces
java.naming.provider.url=localhost:1099

File: Main.java
import javax.ejb.EJB;
import javax.naming.InitialContext;
public class Main {
  
  public static void main(String[] a) throws Exception {
    EmployeeServiceRemote service = null;
    // Context compEnv = (Context) new InitialContext().lookup("java:comp/env");
    // service = (HelloService)new InitialContext().lookup("java:comp/env/ejb/HelloService");
    service = (EmployeeServiceRemote) new InitialContext().lookup("EmployeeBean/remote");
    service.addItem("item", 10);
    service.removeItem("item", 1);
    service.checkout(10);
    //service.cancel();
  }
}

Stateful Session Bean And Entity Manager

File: Employee.java
import static javax.persistence.FetchType.LAZY;
import java.io.Serializable;
import javax.persistence.Basic;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Lob;
import javax.persistence.Table;
@Entity
//@Table(name="EMP", schema="HR")
@Table(name="EMP")
public class Employee implements Serializable {
  @Id
  @Column(name = "EMP_ID")
  private int id;
  @Column(name = "COMM")
  private String name;
  @Column(name = "SAL")
  private long salary;
  
  public Employee() {
  }
  public Employee(int id) {
    this.id = id;
  }
  public int getId() {
    return id;
  }
  public void setId(int id) {
    this.id = id;
  }
  public String getName() {
    return name;
  }
  public void setName(String name) {
    this.name = name;
  }
  public long getSalary() {
    return salary;
  }
  public void setSalary(long salary) {
    this.salary = salary;
  }

  public String toString() {
    return "Employee id: " + getId() + " name: " + getName() + " salary: " + getSalary();
  }
}

File: EmployeeService.java

import java.util.Collection;
import javax.ejb.Stateful;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import javax.persistence.PersistenceContextType;
import javax.persistence.Query;
@Stateful
public class EmployeeService implements EmployeeServiceLocal, EmployeeServiceRemote {
  @PersistenceContext(unitName="EmployeeService", type=PersistenceContextType.TRANSACTION)
  EntityManager em;
  
  public EmployeeService() {
  }
  public Employee createEmployee(int id, String name, long salary, byte[] pic) {
    Employee emp = new Employee(id);
    emp.setName(name);
    emp.setSalary(salary);
    
    em.persist(emp);
    
    emp = findEmployee(id);
    System.out.println(emp);
    em.flush();
    return emp;
  }
  public void removeEmployee(int id) {
    Employee emp = findEmployee(id);
    if (emp != null) {
      em.remove(emp);
    }
  }
  public Employee raiseEmployeeSalary(int id, long raise) {
    Employee emp = em.find(Employee.class, id);
    if (emp != null) {
      emp.setSalary(emp.getSalary() + raise);
    }
    return emp;
  }
  public Employee findEmployee(int id) {
    return em.find(Employee.class, id);
  }
  public Collection<Employee> findAllEmployees() {
    Query query = em.createQuery("SELECT e FROM Employee e");
    return (Collection<Employee>) query.getResultList();
  }
  
  public void doAction(){
  }
}
    

File: EmployeeServiceLocal.java

import java.util.Collection;
import javax.ejb.Local;
@Local
public interface EmployeeServiceLocal {
    public void doAction();
    public Employee createEmployee(int id, String name, long salary, byte[] pic) ;
    public void removeEmployee(int id);
    public Employee raiseEmployeeSalary(int id, long raise) ;
    public Employee findEmployee(int id);
    public Collection<Employee> findAllEmployees() ;
}

File: EmployeeServiceRemote.java


import java.util.Collection;
import javax.ejb.Remote;
@Remote
public interface EmployeeServiceRemote{
  public void doAction();  
  public Employee createEmployee(int id, String name, long salary, byte[] pic) ;
  public void removeEmployee(int id);
  public Employee raiseEmployeeSalary(int id, long raise) ;
  public Employee findEmployee(int id);
  public Collection<Employee> findAllEmployees() ;  
}

File: jndi.properties
java.naming.factory.initial=org.jnp.interfaces.NamingContextFactory
java.naming.factory.url.pkgs=org.jboss.naming:org.jnp.interfaces
java.naming.provider.url=localhost:1099

File: Main.java
import java.util.Collection;
import javax.naming.InitialContext;
public class Main {
  public static void main(String[] a) throws Exception {
    EmployeeServiceRemote service = null;
    // Context compEnv = (Context) new InitialContext().lookup("java:comp/env");
    // service = (HelloService)new InitialContext().lookup("java:comp/env/ejb/HelloService");
    service = (EmployeeServiceRemote) new InitialContext().lookup("EmployeeService/remote");
    
    
    
    service.createEmployee(158, "AAA", 45000, "asdf".getBytes());
    service.createEmployee(159, "AAA", 45000, "asdf".getBytes());
    Employee emp = service.findEmployee(158);
    System.out.println(emp);
    
    Collection<Employee> list = service.findAllEmployees();
    
    System.out.println(list);
  }
}

Stateful Session Bean And Shopping Cart

File: EmployeeBean.java

import java.util.HashMap;
import java.util.Map;
import javax.ejb.Remove;
import javax.ejb.Stateful;

@Stateful
public class EmployeeBean implements EmployeeServiceLocal, EmployeeServiceRemote {

  public EmployeeBean() {
  }
  private HashMap<String,Integer> items = new HashMap<String,Integer>();
  public void addItem(String item, int quantity) {
      Integer orderQuantity = items.get(item);
      if (orderQuantity == null) {
          orderQuantity = 0;
      }
      orderQuantity += quantity;
      items.put(item, orderQuantity);
  }
  public void removeItem(String item, int quantity) {
      Integer orderQuantity = items.get(item);
      if (orderQuantity == null) {
          return;
      }
      orderQuantity -= quantity;
      if (orderQuantity > 0) {
          items.put(item, orderQuantity);         
      } else {
          items.remove(item);
      }
  }
  
  public Map<String, Integer> getItems() {
      return items;
  }
  @Remove
  public void checkout(int paymentId) {
    System.out.println("checkout");
  }
  @Remove
  public void cancel() {
  }

}

File: EmployeeServiceLocal.java
import java.util.Map;
import javax.ejb.Local;

@Local
public interface EmployeeServiceLocal {
  public void addItem(String id, int quantity);
  public void removeItem(String id, int quantity);
  public Map<String, Integer> getItems();
  public void checkout(int paymentId);
  public void cancel();
}

File: EmployeeServiceRemote.java


import java.util.Map;
import javax.ejb.Remote;

@Remote
public interface EmployeeServiceRemote {
  public void addItem(String id, int quantity);
  public void removeItem(String id, int quantity);
  public Map<String, Integer> getItems();
  public void checkout(int paymentId);
  public void cancel();
}

File: Employee.java

import javax.persistence.Entity;
import javax.persistence.EntityListeners;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.PostRemove;

@Entity
public class Employee implements java.io.Serializable {
  private int id;
  private String firstName;
  private String lastName;
  @Id
  @GeneratedValue
  public int getId() {
    return id;
  }

  @PostRemove
  public void postRemove()
  {
     System.out.println("@PostRemove");
  }
  public void setId(int id) {
    this.id = id;
  }
  public String getFirstName() {
    return firstName;
  }
  public void setFirstName(String first) {
    this.firstName = first;
  }
  public String getLastName() {
    return lastName;
  }
  public void setLastName(String last) {
    this.lastName = last;
  }
}

File: jndi.properties
java.naming.factory.initial=org.jnp.interfaces.NamingContextFactory
java.naming.factory.url.pkgs=org.jboss.naming:org.jnp.interfaces
java.naming.provider.url=localhost:1099

File: Main.java
import javax.ejb.EJB;
import javax.naming.InitialContext;
public class Main {
  
  public static void main(String[] a) throws Exception {
    EmployeeServiceRemote service = null;
    // Context compEnv = (Context) new InitialContext().lookup("java:comp/env");
    // service = (HelloService)new InitialContext().lookup("java:comp/env/ejb/HelloService");
    service = (EmployeeServiceRemote) new InitialContext().lookup("EmployeeBean/remote");
    service.addItem("item", 10);
    service.removeItem("item", 1);
    service.checkout(10);
    //service.cancel();
  }
}

Stateful Session Bean Lifecycle: PostActivate

File: EmployeeBean.java
import javax.ejb.PostActivate;
import javax.ejb.Stateful;

@Stateful
public class EmployeeBean implements EmployeeServiceLocal, EmployeeServiceRemote {

  public EmployeeBean() {
  }
  public void doAction(){
    System.out.println("doAction");
    
  }
  @PostActivate
  public void PostActivate() {
    System.out.println("PostActivate");
  }
}

File: EmployeeServiceLocal.java
import java.util.Map;
import javax.ejb.Local;

@Local
public interface EmployeeServiceLocal {
  public void doAction();
}

File: EmployeeServiceRemote.java

import javax.ejb.Remote;
@Remote
public interface EmployeeServiceRemote {
  public void doAction();
}

File: Main.java
import javax.ejb.EJB;
import javax.naming.InitialContext;
public class Main {
  
  public static void main(String[] a) throws Exception {
    EmployeeServiceRemote service = null;
    // Context compEnv = (Context) new InitialContext().lookup("java:comp/env");
    // service = (HelloService)new InitialContext().lookup("java:comp/env/ejb/HelloService");
    service = (EmployeeServiceRemote) new InitialContext().lookup("EmployeeBean/remote");
    service.doAction();
  }
}

File: Employee.java

import javax.persistence.Entity;
import javax.persistence.EntityListeners;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.PostRemove;

@Entity
public class Employee implements java.io.Serializable {
  private int id;
  private String firstName;
  private String lastName;
  @Id
  @GeneratedValue
  public int getId() {
    return id;
  }

  @PostRemove
  public void postRemove()
  {
     System.out.println("@PostRemove");
  }
  public void setId(int id) {
    this.id = id;
  }
  public String getFirstName() {
    return firstName;
  }
  public void setFirstName(String first) {
    this.firstName = first;
  }
  public String getLastName() {
    return lastName;
  }
  public void setLastName(String last) {
    this.lastName = last;
  }
}

File: jndi.properties
java.naming.factory.initial=org.jnp.interfaces.NamingContextFactory
java.naming.factory.url.pkgs=org.jboss.naming:org.jnp.interfaces
java.naming.provider.url=localhost:1099

Stateful Session Bean Lifecycle: PostConstruct

File: Employee.java

import javax.persistence.Entity;
import javax.persistence.EntityListeners;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.PostRemove;

@Entity
public class Employee implements java.io.Serializable {
  private int id;
  private String firstName;
  private String lastName;
  @Id
  @GeneratedValue
  public int getId() {
    return id;
  }

  @PostRemove
  public void postRemove()
  {
     System.out.println("@PostRemove");
  }
  public void setId(int id) {
    this.id = id;
  }
  public String getFirstName() {
    return firstName;
  }
  public void setFirstName(String first) {
    this.firstName = first;
  }
  public String getLastName() {
    return lastName;
  }
  public void setLastName(String last) {
    this.lastName = last;
  }
}

File: EmployeeBean.java
import javax.annotation.PostConstruct;
import javax.ejb.Stateful;

@Stateful
public class EmployeeBean implements EmployeeServiceLocal, EmployeeServiceRemote {

  public EmployeeBean() {
  }
  public void doAction(){
    System.out.println("doAction");
    
  }
  @PostConstruct
  public void PostConstruct() {
    System.out.println("PostConstruct");
  }
}

File: EmployeeServiceLocal.java
import java.util.Map;
import javax.ejb.Local;

@Local
public interface EmployeeServiceLocal {
  public void doAction();
}

File: EmployeeServiceRemote.java

import javax.ejb.Remote;
@Remote
public interface EmployeeServiceRemote {
  public void doAction();
}

File: jndi.properties
java.naming.factory.initial=org.jnp.interfaces.NamingContextFactory
java.naming.factory.url.pkgs=org.jboss.naming:org.jnp.interfaces
java.naming.provider.url=localhost:1099

File: Main.java
import javax.ejb.EJB;
import javax.naming.InitialContext;
public class Main {
  
  public static void main(String[] a) throws Exception {
    EmployeeServiceRemote service = null;
    // Context compEnv = (Context) new InitialContext().lookup("java:comp/env");
    // service = (HelloService)new InitialContext().lookup("java:comp/env/ejb/HelloService");
    service = (EmployeeServiceRemote) new InitialContext().lookup("EmployeeBean/remote");
    service.doAction();
  }
}

Stateful Session Bean Lifecycle: PreDestroy

File: Employee.java

import javax.persistence.Entity;
import javax.persistence.EntityListeners;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.PostRemove;

@Entity
public class Employee implements java.io.Serializable {
  private int id;
  private String firstName;
  private String lastName;
  @Id
  @GeneratedValue
  public int getId() {
    return id;
  }

  @PostRemove
  public void postRemove()
  {
     System.out.println("@PostRemove");
  }
  public void setId(int id) {
    this.id = id;
  }
  public String getFirstName() {
    return firstName;
  }
  public void setFirstName(String first) {
    this.firstName = first;
  }
  public String getLastName() {
    return lastName;
  }
  public void setLastName(String last) {
    this.lastName = last;
  }
}

File: EmployeeBean.java
import javax.annotation.PreDestroy;
import javax.ejb.Stateful;

@Stateful
public class EmployeeBean implements EmployeeServiceLocal, EmployeeServiceRemote {

  public EmployeeBean() {
  }
  public void doAction(){
    System.out.println("doAction");
    
  }
  @PreDestroy
  public void shutdown() {
    System.out.println("PreDestroy");
  }
}

File: EmployeeServiceLocal.java
import java.util.Map;
import javax.ejb.Local;

@Local
public interface EmployeeServiceLocal {
  public void doAction();
}

File: EmployeeServiceRemote.java

import javax.ejb.Remote;
@Remote
public interface EmployeeServiceRemote {
  public void doAction();
}

File: jndi.properties
java.naming.factory.initial=org.jnp.interfaces.NamingContextFactory
java.naming.factory.url.pkgs=org.jboss.naming:org.jnp.interfaces
java.naming.provider.url=localhost:1099

File: Main.java
import javax.ejb.EJB;
import javax.naming.InitialContext;
public class Main {
  
  public static void main(String[] a) throws Exception {
    EmployeeServiceRemote service = null;
    // Context compEnv = (Context) new InitialContext().lookup("java:comp/env");
    // service = (HelloService)new InitialContext().lookup("java:comp/env/ejb/HelloService");
    service = (EmployeeServiceRemote) new InitialContext().lookup("EmployeeBean/remote");
    service.doAction();
  }
}

Stateful Session Bean Lifecycle: PrePassivate

File: Employee.java

import javax.persistence.Entity;
import javax.persistence.EntityListeners;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.PostRemove;

@Entity
public class Employee implements java.io.Serializable {
  private int id;
  private String firstName;
  private String lastName;
  @Id
  @GeneratedValue
  public int getId() {
    return id;
  }

  @PostRemove
  public void postRemove()
  {
     System.out.println("@PostRemove");
  }
  public void setId(int id) {
    this.id = id;
  }
  public String getFirstName() {
    return firstName;
  }
  public void setFirstName(String first) {
    this.firstName = first;
  }
  public String getLastName() {
    return lastName;
  }
  public void setLastName(String last) {
    this.lastName = last;
  }
}

File: EmployeeBean.java
import javax.ejb.PrePassivate;
import javax.ejb.Stateful;

@Stateful
public class EmployeeBean implements EmployeeServiceLocal, EmployeeServiceRemote {

  public EmployeeBean() {
  }
  public void doAction(){
    System.out.println("doAction");
    
  }
  @PrePassivate
  public void PrePassivate() {
    System.out.println("PrePassivate");
  }
}

File: EmployeeServiceLocal.java
import java.util.Map;
import javax.ejb.Local;

@Local
public interface EmployeeServiceLocal {
  public void doAction();
}

File: EmployeeServiceRemote.java

import javax.ejb.Remote;
@Remote
public interface EmployeeServiceRemote {
  public void doAction();
}

File: jndi.properties
java.naming.factory.initial=org.jnp.interfaces.NamingContextFactory
java.naming.factory.url.pkgs=org.jboss.naming:org.jnp.interfaces
java.naming.provider.url=localhost:1099

File: Main.java
import javax.ejb.EJB;
import javax.naming.InitialContext;
public class Main {
  
  public static void main(String[] a) throws Exception {
    EmployeeServiceRemote service = null;
    // Context compEnv = (Context) new InitialContext().lookup("java:comp/env");
    // service = (HelloService)new InitialContext().lookup("java:comp/env/ejb/HelloService");
    service = (EmployeeServiceRemote) new InitialContext().lookup("EmployeeBean/remote");
    service.doAction();
  }
}

Use Lifecycle Method To Manage Collection In Stateful Session Bean

File: EmployeeBean.java
import java.util.ArrayList;
import javax.annotation.PostConstruct;
import javax.annotation.PreDestroy;
import javax.ejb.Remove;
import javax.ejb.Stateful;
@Stateful
public class EmployeeBean implements EmployeeServiceLocal, EmployeeServiceRemote {
  public EmployeeBean() {
  }
  public ArrayList cartItems;

  public void addWineItem(String wine) {
    cartItems.add(wine);
  }
  public void removeWineItem(String wine) {
    cartItems.remove(wine);
  }
  public void setCartItems(ArrayList cartItems) {
    this.cartItems = cartItems;
  }
  public ArrayList getCartItems() {
    return cartItems;
  }
  @PostConstruct
  public void initialize() {
    cartItems = new ArrayList();
  }
  @PreDestroy
  public void exit() {
    System.out.println("Saved items list into database");
  }
  @Remove
  public void stopSession() {
    // The method body can be empty. 
    System.out.println("From stopSession method with @Remove annotation");
  }
  public void doAction() {
    System.out.println("Processing...");
  }
}

File: EmployeeServiceLocal.java
import javax.ejb.Local;
import javax.ejb.Remote;

@Local
public interface EmployeeServiceLocal{
  public void doAction();
}

File: EmployeeServiceRemote.java
import javax.ejb.Remote;
@Remote
public interface EmployeeServiceRemote {
  public void doAction();

}

File: Employee.java
import javax.persistence.Entity;
import javax.persistence.EntityListeners;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.PostRemove;
@Entity
public class Employee implements java.io.Serializable {
  private int id;
  private String firstName;
  private String lastName;
  @Id
  @GeneratedValue
  public int getId() {
    return id;
  }

  @PostRemove
  public void postRemove()
  {
     System.out.println("@PostRemove");
  }
  public void setId(int id) {
    this.id = id;
  }
  public String getFirstName() {
    return firstName;
  }
  public void setFirstName(String first) {
    this.firstName = first;
  }
  public String getLastName() {
    return lastName;
  }
  public void setLastName(String last) {
    this.lastName = last;
  }
}

File: jndi.properties
java.naming.factory.initial=org.jnp.interfaces.NamingContextFactory
java.naming.factory.url.pkgs=org.jboss.naming:org.jnp.interfaces
java.naming.provider.url=localhost:1099

File: Main.java
import javax.ejb.EJB;
import javax.naming.InitialContext;
public class Main {
  
  public static void main(String[] a) throws Exception {
    EmployeeServiceRemote service = null;
    // Context compEnv = (Context) new InitialContext().lookup("java:comp/env");
    // service = (HelloService)new InitialContext().lookup("java:comp/env/ejb/HelloService");
    service = (EmployeeServiceRemote) new InitialContext().lookup("EmployeeBean/remote");
    service.doAction();
  }
}