Java/EJB3/Stateless Session Bean

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EJB Method With Interceptors

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: EmployeeService.java
import javax.ejb.Stateless;
import javax.interceptor.Interceptors;
@Stateless
public class EmployeeService implements EmployeeServiceLocal, EmployeeServiceRemote {
  public EmployeeService() {
  }
  
  @Interceptors(Profiler.class)
  public void doAction() {
    System.out.println("do Action");
  }
}

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: Profiler.java
import javax.interceptor.AroundInvoke;
import javax.interceptor.InvocationContext;
public class Profiler {
  @AroundInvoke
  public Object profile(InvocationContext invocation) throws Exception {
    long startTime = System.currentTimeMillis();
    try {
      return invocation.proceed();
    } finally {
      long endTime = System.currentTimeMillis() - startTime;
      System.out.println("Method " + invocation.getMethod() + " took " + endTime + " (ms)");
    }
  }
}

File: Main.java
import java.util.Date;
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





EJB Tutorial from JBoss: stateless session bean

File: Calculator.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.stateless.bean;
public interface Calculator
{
   int add(int x, int y);
   int subtract(int x, int y);
}

File: CalculatorBean.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.stateless.bean;
import javax.ejb.Stateless;
@Stateless
public class CalculatorBean implements CalculatorRemote, CalculatorLocal
{
   public int add(int x, int y)
   {
      return x + y;
   }
   public int subtract(int x, int y)
   {
      return x - y;
   }
}

File: CalculatorLocal.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.stateless.bean;
import javax.ejb.Local;

@Local
public interface CalculatorLocal extends Calculator
{
}

File: CalculatorRemote.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.stateless.bean;
import javax.ejb.Remote;

@Remote
public interface CalculatorRemote extends Calculator
{
}
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.stateless.client;
import org.jboss.tutorial.stateless.bean.Calculator;
import org.jboss.tutorial.stateless.bean.CalculatorRemote;
import javax.naming.InitialContext;
public class Client
{
   public static void main(String[] args) throws Exception
   {
      InitialContext ctx = new InitialContext();
      Calculator calculator = (Calculator) ctx.lookup("CalculatorBean/remote");
      System.out.println("1 + 1 = " + calculator.add(1, 1));
      System.out.println("1 - 1 = " + calculator.subtract(1, 1));
   }
}





EJB Tutorial from JBoss: stateless session bean deployment descriptor

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 Stateless Session Bean Tutorial</description>
   <display-name>JBoss Stateless Session Bean Tutorial</display-name>
   <enterprise-beans>
      <session>
         <ejb-name>Calculator</ejb-name>
         <remote>org.jboss.tutorial.stateless_deployment_descriptor.bean.CalculatorRemote</remote>
         <local>org.jboss.tutorial.stateless_deployment_descriptor.bean.CalculatorLocal</local>
         <ejb-class>org.jboss.tutorial.stateless_deployment_descriptor.bean.CalculatorBean</ejb-class>
         <session-type>Stateless</session-type>
         <transaction-type>Container</transaction-type>
      </session>
   </enterprise-beans>
</ejb-jar>

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>Calculator</ejb-name>
         <jndi-name>org.jboss.tutorial.stateless_deployment_descriptor.bean.CalculatorRemote</jndi-name>
         <local-jndi-name>org.jboss.tutorial.stateless_deployment_descriptor.bean.CalculatorLocal</local-jndi-name>
      </session>
   </enterprise-beans>
</jboss>





Mark One Method With Two Lifecycle Annotations

File: EmployeeBean.java

import javax.annotation.PostConstruct;
import javax.ejb.PostActivate;
import javax.ejb.Stateless;
@Stateless
public class EmployeeBean implements EmployeeServiceLocal, EmployeeServiceRemote {

  public EmployeeBean() {
  }
  @PostConstruct
  @PostActivate 
  public void doAction() {
  }
}

File: EmployeeServiceLocal.java

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: 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: 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: 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





One Stateless Session Bean Call Another Stateless Bean

File: AnotherBeanLocal.java

public interface AnotherBeanLocal {
  public void doAnother();
}

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.EJB;
import javax.ejb.EJBException;
import javax.ejb.Stateless;
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.NamingException;
@Stateless
@EJB(name = "audit", beanInterface = AnotherBeanLocal.class)
public class EmployeeBean implements EmployeeServiceLocal, EmployeeServiceRemote {
  public EmployeeBean() {
  }
  public void doAction() {
    System.out.println("doAction");
    try {
      Context ctx = new InitialContext();
      AnotherBeanLocal a = (AnotherBeanLocal) ctx.lookup("java:comp/env/audit");
      a.doAnother();
    } catch (NamingException e) {
      throw new EJBException(e);
    }
  }
}

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: AnotherBean.java
import javax.ejb.Stateless;
@Stateless
public class AnotherBean implements AnotherBeanLocal {
  public void doAnother(){
    System.out.println("from another bean");
  }
}

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: 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





Stateless Session Bean With Three Methods

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;
import bean.CountRemote;
public class Main {
  public static void main(String[] a) throws Exception {
    String name = "jexp";
    CountRemote service = null;
    // Context compEnv = (Context) new InitialContext().lookup("java:comp/env");
    // service = (HelloService)new
    // InitialContext().lookup("java:comp/env/ejb/HelloService");
    service = (CountRemote) new InitialContext().lookup("CountBean/remote");
    int countVal = 9;
    service.set(countVal);
    countVal = service.count();
    System.out.println(countVal);
    System.out.println("Calling count() on beans...");
    countVal = service.count();
    System.out.println(countVal);
    service.remove();
  }
}

File: CountBean.java
package bean;
import javax.ejb.Remote;
import javax.ejb.Remove;
import javax.ejb.Stateless;
import javax.interceptor.Interceptors;
@Stateless
@Remote(CountRemote.class)
public class CountBean implements CountLocal, CountRemote {
    /** The current counter is our conversational state. */
    private int val;
    /**
     * The count() business method.
     */
    public int count() {
        System.out.println("count()");
        return ++val;
    }
    /**
     * The set() business method.
     */
    public void set(int val) {
        this.val = val;
        System.out.println("set()");
    }
    /**
     * The remove method is annotated so that the container knows
     * it can remove the bean after this method returns.
     */
    @Remove
    public void remove() {
        System.out.println("remove()");
    }
}

File: CountLocal.java
package bean;

import javax.ejb.Local;
@Local
public interface CountLocal  {
    /**
     * Increments the counter by 1
     */
    public int count();
    /**
     * Sets the counter to val
     * @param val
     */
    public void set(int val);
    /**
     * removes the counter
     */
    public void remove();
  }

File: CountRemote.java
package bean;

import javax.ejb.Remote;
@Remote
public interface CountRemote{
  /**
   * Increments the counter by 1
   */
  public int count();
  /**
   * Sets the counter to val
   * @param val
   */
  public void set(int val);
  /**
   * removes the counter
   */
  public void remove();
}





Throw Exception Out of Ejb 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: EmployeeService.java
import javax.ejb.Stateless;
import javax.transaction.TransactionManager;
@Stateless
public class EmployeeService implements EmployeeServiceLocal, EmployeeServiceRemote {
  public EmployeeService() {
  }
  
  @JndiInjected("java:/TransactionManager")
  TransactionManager tm;
  public void doAction() throws Exception {
    System.out.println("Is there a transaction: " + (tm.getTransaction() != null));
  }
}

File: EmployeeServiceLocal.java

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

}

File: EmployeeServiceRemote.java


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

File: JndiInjected.java

import java.lang.annotation.*;
@Target({ElementType.METHOD, ElementType.FIELD})
@Retention(RetentionPolicy.RUNTIME)
public @interface JndiInjected {
   String value();
}

File: JndiInjector.java

import java.lang.reflect.*;
import javax.ejb.*;
import javax.interceptor.*;
import javax.naming.*;
import javax.annotation.PostConstruct;
public class JndiInjector {
   @PostConstruct
   public void jndiInject(InvocationContext invocation) {
      Object target = invocation.getTarget();
      Field[] fields = target.getClass().getDeclaredFields();
      Method[] methods = target.getClass().getDeclaredMethods();
      // find all @JndiInjected fields methods and set them
      try {
         InitialContext ctx = new InitialContext();
         for (Method method : methods) {
            JndiInjected inject = method.getAnnotation(JndiInjected.class);
            if (inject != null) {
               Object obj = ctx.lookup(inject.value());
               method.setAccessible(true);
               method.invoke(target, obj);
            }
         }
         for (Field field : fields) {
            JndiInjected inject = field.getAnnotation(JndiInjected.class);
            if (inject != null) {
               Object obj = ctx.lookup(inject.value());
               field.setAccessible(true);
               field.set(target, obj);
            }
         }
         invocation.proceed();
      } catch (Exception ex) {
         throw new EJBException("Failed to execute @JndiInjected", ex);
      }
   }
}

File: Main.java
import java.util.Date;
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





Use EJB To Mark 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
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 javax.ejb.EJB;
import javax.ejb.Stateless;
@Stateless
public class EmployeeService implements EmployeeServiceLocal, EmployeeServiceRemote {
  public EmployeeService() {
  }
  @EJB private EmployeeServiceLocal processPayment;
  
  
  public void doAction() {
    System.out.println("do Action");
    
    processPayment.doAnother();
  }

  public void doAnother() {
    System.out.println("do another");
    
    
  }
}

File: EmployeeServiceLocal.java

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

File: EmployeeServiceRemote.java


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

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.Date;
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();
  }
}





Use Stateless Annotation To Change Ejb Name

File: EmployeeBean.java
import javax.ejb.Stateful;
import javax.interceptor.AroundInvoke;
import javax.interceptor.InvocationContext;
@Stateful(name = "MyEmployeeBean")
public class EmployeeBean implements EmployeeServiceLocal, EmployeeServiceRemote {
  public EmployeeBean() {
  }
  public void doAction() {
    System.out.println("Processing...");
  }
  @AroundInvoke
  public Object TimerLog(InvocationContext ctx) throws Exception {
    String beanClassName = ctx.getClass().getName();
    String businessMethodName = ctx.getMethod().getName();
    String target = beanClassName + "." + businessMethodName;
    long startTime = System.currentTimeMillis();
    System.out.println("Invoking " + target);
    try {
      return ctx.proceed();
    } finally {
      System.out.println("Exiting " + target);
      long totalTime = System.currentTimeMillis() - startTime;
      System.out.println("Business method " + businessMethodName + "in " + beanClassName + "takes "
          + totalTime + "ms to execute");
    }
  }
}

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: 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("MyEmployeeBean/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;
  }
}





Use Stateless Session Bean To PersistEntity

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;
  @Basic(fetch=LAZY)
  @Lob @Column(name="PIC")
  private byte[] picture;
  
  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 byte[] getPicture() {
    return picture;
  }
  public void setPicture(byte[] picture) {
    this.picture = picture;
  }
  public String toString() {
    return "Employee id: " + getId() + " name: " + getName() + " salary: " + getSalary();
  }
}

File: EmployeeService.java

import java.util.Collection;
import javax.annotation.Resource;
import javax.ejb.Stateless;
import javax.ejb.TransactionAttribute;
import javax.ejb.TransactionAttributeType;
import javax.ejb.TransactionManagement;
import javax.ejb.TransactionManagementType;
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import javax.persistence.Query;
import javax.transaction.UserTransaction;
@Stateless
public class EmployeeService implements EmployeeServiceLocal, EmployeeServiceRemote {
  @PersistenceContext(unitName="EmployeeService")
  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);
    emp.setPicture(pic);
    
    em.persist(emp);
    
    
    emp = findEmployee(id);
    System.out.println(emp);
    
    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(){
    Employee emp = new Employee(1);
    emp.setName("name");
    emp.setSalary(100);
    emp.setPicture("pic".getBytes());
    
    em.persist(emp);
    
    
    emp = findEmployee(1);
    System.out.println(emp);
  }
}
    

File: EmployeeServiceLocal.java

import javax.ejb.Local;
@Local
public interface EmployeeServiceLocal {
    public void doAction();
  public Employee createEmployee(int id, String name, long salary, byte[] pic) ;
}

File: EmployeeServiceRemote.java


import javax.ejb.Remote;
@Remote
public interface EmployeeServiceRemote{
  public Employee createEmployee(int id, String name, long salary, byte[] pic) ;
  
  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.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.doAction();
  }
}


File: persistence.xml
<persistence xmlns="http://java.sun.ru/xml/ns/persistence"
             xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
             xsi:schemaLocation="http://java.sun.ru/xml/ns/persistence http://java.sun.ru/xml/ns/persistence/persistence" version="1.0">
  <persistence-unit name="EmployeeService" > <!-- transaction-type="JTA" -->
        <jta-data-source>java:/DefaultDS</jta-data-source>
        <properties>
         <property name="hibernate.hbm2ddl.auto" value="create-drop"/>
        </properties>
<!--
    <properties>
      <property name="hibernate.dialect" value="org.hibernate.dialect.HSQLDialect"/>
      <property name="hibernate.hbm2ddl.auto" value="update"/>
      <property name="hibernate.connection.driver_class" value="org.hsqldb.jdbcDriver"/>
      <property name="hibernate.connection.username" value="sa"/>
      <property name="hibernate.connection.password" value=""/>
      <property name="hibernate.connection.url" value="jdbc:hsqldb:data/tutorial"/>
    </properties>
-->    
  </persistence-unit>
</persistence>

File: ejb-jar.xml
<?xml version="1.0" encoding="UTF-8"?>
<ejb-jar>
   <enterprise-beans>
   </enterprise-beans>
</ejb-jar>


Источник — «http://jexp.ru/index.php?title=Java/EJB3/Stateless_Session_Bean&oldid=7761»