Java/EJB3/Resource

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EJB Tutorial from JBoss: resource reference

File: TestENC.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.jboss_resource_ref.bean;
import java.rmi.RemoteException;
import javax.naming.NamingException;
/**
@author  Scott.Stark@jboss.org
@version $Revision: 57207 $
*/
public interface TestENC
{
   public void accessENC() throws NamingException;
   
   public void remove();
}

File: TestENCBean.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.jboss_resource_ref.bean;
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import javax.ejb.Remove;
import org.apache.log4j.Logger;
import org.jboss.ejb3.Container;
/** A bean that does nothing but access resources from the ENC
 to test ENC usage.
 @author Scott.Stark@jboss.org
 @version $Revision: 57207 $
 */
public class TestENCBean implements TestENC
{
   Logger log = Logger.getLogger(getClass());
   public void accessENC() throws NamingException
   {
      // Obtain the enterprise beans environment naming context.
      Context initCtx = new InitialContext();
      Context myEnv = (Context) initCtx.lookup(Container.ENC_CTX_NAME + "/env");
      
      // This bean should have the full ENC setup of the ENCBean
      testJdbcDataSource(initCtx, myEnv);
      testMail(initCtx, myEnv);
      testJMS(initCtx, myEnv);
      testResourceEnvEntries(initCtx, myEnv);
   }
   private void testJdbcDataSource(Context initCtx, Context myEnv) throws NamingException
   {
      // JDBC DataSource
      Object obj = myEnv.lookup("jdbc/DefaultDS");
      if ((obj instanceof javax.sql.DataSource) == false)
         throw new NamingException("jdbc/DefaultDS is not a javax.sql.DataSource");
      log.info("Found data source resource ref");
   }
   private void testMail(Context initCtx, Context myEnv) throws NamingException
   {
      // JavaMail Session
      Object obj = myEnv.lookup("mail/DefaultMail");
      if ((obj instanceof javax.mail.Session) == false)
         throw new NamingException("DefaultMail is not a javax.mail.Session");
      log.info("Found mail resource ref");
   }
   private void testJMS(Context initCtx, Context myEnv) throws NamingException
   {
      // JavaMail Session
      Object obj = myEnv.lookup("jms/QueFactory");
      if ((obj instanceof javax.jms.QueueConnectionFactory) == false)
         throw new NamingException("mail/DefaultMail is not a javax.jms.QueueConnectionFactory");
      log.info("Found jms queue resource ref");
   }
   private void testResourceEnvEntries(Context initCtx, Context myEnv) throws NamingException
   {
      Object obj = myEnv.lookup("res/aQueue");
      if ((obj instanceof javax.jms.Queue) == false)
         throw new NamingException("res/aQueue is not a javax.jms.Queue");
      log.info("Found jms queue resource env ref");
   }
   
   @Remove
   public void remove()
   {
      
   }
}

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.jboss_resource_ref.client;
import javax.naming.InitialContext;
import org.jboss.tutorial.jboss_resource_ref.bean.TestENC;
/**
 * Comment
 *
 * @author 



== Mark Resource ==






   
  <!-- start source code -->
   
    <source lang="java">

File: EmployeeServiceLocal.java

import java.util.Collection;
import javax.ejb.Local;
@Local
public interface EmployeeServiceLocal {
    public void doAction();
}

File: EmployeeServiceRemote.java


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

File: EntityListener.java

import javax.persistence.PostLoad;
import javax.persistence.PostPersist;
import javax.persistence.PostRemove;
import javax.persistence.PostUpdate;
public class EntityListener
{
   @PostUpdate
   public void update(Object entity)
   {
      System.out.println("@PostUpdate: " + entity.getClass().getName());
   }
   @PostPersist
   public void persist(Object entity)
   {
      System.out.println("@PostPersist: " + entity.getClass().getName());
   }
   @PostLoad
   public void load(Object entity)
   {
      System.out.println("@PostLoad: " + entity.getClass().getName());
   }
      
   @PostRemove
   public void remove(Object entity)
   {
      System.out.println("@PostRemove: " + entity.getClass().getName());
   }
  
}

File: Employee.java
import javax.persistence.Entity;
import javax.persistence.EntityListeners;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.PostRemove;
@Entity
@EntityListeners(EntityListener.class)
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: EmployeeService.java

import java.sql.Connection;
import java.sql.PreparedStatement;
import javax.annotation.Resource;
import javax.ejb.Stateless;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import javax.sql.DataSource;
@Stateless
public class EmployeeService implements EmployeeServiceLocal, EmployeeServiceRemote {
  @PersistenceContext(unitName="EmployeeService")
  EntityManager em;
  
  @Resource(mappedName="java:/DefaultDS") DataSource dataSource;
  
  public EmployeeService() {
  }
  public void doAction(){
/*    Employee employee = new Employee();
    employee.setFirstName("E");
    employee.setLastName("E");
    em.persist(employee);
    employee.setLastName("New");
    em.merge(employee);
    
    em.remove(employee);
    
    em.flush();
    System.out.println("saved");
    
    
    List list = em.createQuery("FROM Employee p").getResultList();
    */
    PreparedStatement ps = null;
    Connection con = null;
    try
    {
       con = dataSource.getConnection();
       System.out.println("Creating table PAYMENT...");
       ps = con.prepareStatement("CREATE TABLE PAYMENT ( " +
                                 "CUSTOMER_ID INT, " +
                                 "CREDIT_EXP_DATE DATE" +
                                 ")");
       ps.execute();
       System.out.println("...done!");    
    }catch(Exception e){
      
    }       
  }
}
    

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.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





Reference Resource In EJB

File: Employee.java
import javax.persistence.Entity;
import javax.persistence.EntityListeners;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.PostRemove;
@Entity
@EntityListeners(EntityListener.class)
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: EmployeeService.java

import java.sql.Connection;
import java.sql.PreparedStatement;
import javax.annotation.Resource;
import javax.ejb.Stateless;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import javax.sql.DataSource;
@Stateless
public class EmployeeService implements EmployeeServiceLocal, EmployeeServiceRemote {
  @PersistenceContext(unitName="EmployeeService")
  EntityManager em;
  
  DataSource dataSource;
  int minCheckNumber = 100;
  public EmployeeService() {
  }
  public void doAction(){
/*    Employee employee = new Employee();
    employee.setFirstName("E");
    employee.setLastName("E");
    em.persist(employee);
    employee.setLastName("New");
    em.merge(employee);
    
    em.remove(employee);
    
    em.flush();
    System.out.println("saved");
    
    
    List list = em.createQuery("FROM Employee p").getResultList();
    */
 
  }
}
    

File: EmployeeServiceLocal.java

import java.util.Collection;
import javax.ejb.Local;
@Local
public interface EmployeeServiceLocal {
    public void doAction();
}

File: EmployeeServiceRemote.java


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

File: EntityListener.java

import javax.persistence.PostLoad;
import javax.persistence.PostPersist;
import javax.persistence.PostRemove;
import javax.persistence.PostUpdate;
public class EntityListener
{
   @PostUpdate
   public void update(Object entity)
   {
      System.out.println("@PostUpdate: " + entity.getClass().getName());
   }
   @PostPersist
   public void persist(Object entity)
   {
      System.out.println("@PostPersist: " + entity.getClass().getName());
   }
   @PostLoad
   public void load(Object entity)
   {
      System.out.println("@PostLoad: " + entity.getClass().getName());
   }
      
   @PostRemove
   public void remove(Object entity)
   {
      System.out.println("@PostRemove: " + entity.getClass().getName());
   }
  
}

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.doAction();
  }
}





Resource With Name

File: EmployeeService.java

import java.sql.Connection;
import java.sql.PreparedStatement;
import javax.annotation.Resource;
import javax.ejb.Stateless;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import javax.sql.DataSource;
@Stateless
public class EmployeeService implements EmployeeServiceLocal, EmployeeServiceRemote {
  @PersistenceContext(unitName="EmployeeService")
  EntityManager em;
  
  @Resource(name="min") int minCheckNumber = 100;
  public EmployeeService() {
  }
  public void doAction(){
/*    Employee employee = new Employee();
    employee.setFirstName("E");
    employee.setLastName("E");
    em.persist(employee);
    employee.setLastName("New");
    em.merge(employee);
    
    em.remove(employee);
    
    em.flush();
    System.out.println("saved");
    
    
    List list = em.createQuery("FROM Employee p").getResultList();
    */
 
  }
}
    

File: EmployeeServiceLocal.java

import java.util.Collection;
import javax.ejb.Local;
@Local
public interface EmployeeServiceLocal {
    public void doAction();
}

File: EmployeeServiceRemote.java


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

File: EntityListener.java

import javax.persistence.PostLoad;
import javax.persistence.PostPersist;
import javax.persistence.PostRemove;
import javax.persistence.PostUpdate;
public class EntityListener
{
   @PostUpdate
   public void update(Object entity)
   {
      System.out.println("@PostUpdate: " + entity.getClass().getName());
   }
   @PostPersist
   public void persist(Object entity)
   {
      System.out.println("@PostPersist: " + entity.getClass().getName());
   }
   @PostLoad
   public void load(Object entity)
   {
      System.out.println("@PostLoad: " + entity.getClass().getName());
   }
      
   @PostRemove
   public void remove(Object entity)
   {
      System.out.println("@PostRemove: " + entity.getClass().getName());
   }
  
}

File: Employee.java
import javax.persistence.Entity;
import javax.persistence.EntityListeners;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.PostRemove;
@Entity
@EntityListeners(EntityListener.class)
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 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.doAction();
  }
}


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