EJB Part-1

Java Training Center
(No 1 in Training & Placement)
1
RMI Part 1
Author: SomPrakashRai www.jtcindia.org
Copyright©JTC
RMI
(Remote Method Invocation)
1. RMI is distributed technology, which is first attempt of SUN to provide a
solution to distributed programming. RMI use socket. A socket is a transport
mechanism.
2. No extra software is required for developing a distributed application using
RMI other than JDK.
 RMI provides a way for a java program on one machine to communicate with
object residing in different JVM.
 The important part of RMI architecture are the Stubclass object serialization
and Skelton class.
 RMI uses a layered architecture where each of layers can be enhanced without
affected the other layers.
=:-Developing First RMI application-:=
Server Side Steps:-
1. Define a Business Service Interface (B.S.I.).
a. Your Business Service interface has to extends java.rmi.Remote interface.
b. Each Method inside the Business interface has to throw
java.rmi.RemoteException.
2. Provide the implementation class for Business Service Interface.
a. Business Services implements class has to extends “UnicastRemoteObject”
if not extend then implement class is responsible for correct
implementation of hashCode(), equals(), toString().
b. B.S.I. class has to implement Business Interface.
3. Create the Business Service Implement Service Implementation class object.
4. Bind the B.S.I. class object inside RMI registry or JNDI registry.

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-: Steps in Eclipse :-
1. Create a java Project with the name RMIServer.
2. Create package com.jtcindia.rmi
3. Write the following three files in your package.
a. AccountService.java (interface)
b. AccountServiceImpl.java
c. Server.java (for binding object)
If you have more than one Business class for other purpose than that class
object will create in server.java also.
Client Side Steps :-
1. Locate and get the registry reference.
2. Look Up the registry and get the required remote interface stub.
3. Invoke any required business operation on remote Business stub.
1. Create a java Project called RMI.
2. Create a package java.jtcindia.rmi;
3. Write the following in the Package.
a. Client.java
b. AccountServices.java(copy from the server)
Way to create jar file :-
D:/test> Jar cvf jtc.jar com
(Here AccountServices.class file change to jar file)

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File Required:-
1. Package com.jtcindia.rmi;
Import java.rmi.Remote;
Import java.rmi.RemoteException;
Public interface AccountService extends Remote{
Public double getBal(int accno) throws RemoteException;
}
2. AccountServiceImpl.java
packagecom.jtcindia.rmi;
importjava.rmi.*;
importjava.rmi.server.UnicastRemoteObject;
publicclassAccountServiceImplextendsUnicastRemoteObject
implementsAccountService {
publicAccountServiceImpl() throwsRemoteException {
super();
}
publicdouble getBal(int accno) throws
RemoteException{
System.out.println("getBal() with accno :
"+accno);
return 9999.99;
}}
RemoteException :-This is declare as an interface because in this
there are so many private data available. You have interact with
their subclass method also to avoid data duplication

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3. Server.java :-
importjava.rmi.registry.LocateRegistry;
importjava.rmi.registry.Registry;
public class Server {
public static void main(String[] args) {
try {
Registry reg = LocateRegistry.createRegistry(6789);
AccountServiceasi = new AccountServiceImpl();
reg.bind("ASI", asi);
System.out.println("Server is Running");
} catch (Exception e) {
e.printStackTrace();
}
}
}
4. Client.java :-
importjava.rmi.registry.LocateRegistry;
importjava.rmi.registry.Registry;
1. Here we need to write a default constructor which throws
RemoteException because in super class UnicastRemoteObject there
is a default constructor without throws ServerException.
2. A remote object is one whose method can be invoke from another
JVM.

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public class Client {
public static void main(String[] args) {
try {
Registry reg = LocateRegistry.getRegistry("localhost", 6789);
AccountService as = (AccountService) reg.lookup("ASI");
doublebal = as.getBal(1);
System.out.println(bal);
bal = as.getBal(2);
System.out.println(bal);
} catch (Exception e) {
}
}
}
Binding the instance
of the remote object
to the RMI registry.

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=: EJB2/EJB :=
For Developing any Enterprise Edition you need mainly three types
of services.
 EJB is a remote, distributed multi-tier system. An EJB
application server provide mainly services like transaction
management, Security Management, Object Package which
simplifies the programming effect.
 For any Enterprise Edition development you need these Low
Level Services Commonly which you can get freely from EJB.
 High level Service is nothing but your application code business
logic which will change from Enterprise edition to enterprise
edition.
IMP -: To run RMI application you need “JDK” where to run EJB
application you need “application server”.
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=: EJB2/EJB :=
of services.
edition.
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=: EJB2/EJB :=
of services.
edition.

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 Following are various Application servers available
1. JBOSS(“Red Hat” Linux)
2. Web Logic(“BEA”, Oracle Company)
3. Web sphere(IBM)
Steps to develop and run EJB 2.0 application with JBOSS 4.0
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3. Web sphere(IBM)
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3. Web sphere(IBM)

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Steps to install JBOSS 4.0 :-
1. Click on installer called jems-installer-1.2.0 CRI.jar which is
available in JBOSS-4.0.
2. Select English and OK.
3. Click on next.
4. Click on next.
5. Accept license agreement and next.
6. Provide the location of installation E:/Jboss 4.0.5
7. Click OK on popup.
8. Select the profile all and click on next.
9. Click on next.
10.Provide the server name jtcindia and next.
11. Configure the default and click next.
12. Click next.
13. Provide admin username and password only and click on
next.
14. Click on next.
15. Click on done.
After installing successfully you can see the directory :-

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-: Steps to integrate JBOSS 4.0 with MyEclipse :-
1. Click on window  Preferences
2. My Eclipse workbench  Servers  JBOSS JBOSS 4.x
Integrate means only enable the Plugin.
In “Eclipse” you have to download all the plugin and then
enable if.
3. Select Enable
jBoss home directory: E:/jboss-4.0.5
Server name: jtcindia
Optional program argu:
Optional shutdown arg: -shutdown
4. Expend the JBOSS 4.x
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enable if.
3. Select Enable
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enable if.
3. Select Enable

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JDK
Launch
Paths and select the JDK option. And do the following to
add the JDK.
a. Click on add button.
b. Click on Apply.
5. Select the “Launch” under JBOSS 4.x… Run mode and click
Apply.
6. Click on OK of Preference window.
a. By default Port no: 8080 because it take default of
tomcat which is running on 8080.
b. Change that Port no:- if get any error like JVM_8080
i.e. lifecycleException.
-: Stating JBOSS :-
 Change the Port number: 5555.
 Start the JBOSS from myEclipse.
 Open the browser and type http://localhost:5555/imx-console/
 Enter username & password on popup window.
-: Creating EJB Project in myEclipse :-
1. File new  “EJB Project”
Project name: - E2Hello4JB and select J2EE1.4-EJB2.1 and finish.
2. You can see the following directory structure.

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New otherXMLXML(Basic Tem)ejb-jar.xmlnextcreate xml file
from DTD  select category.
To deployselect the Project name and gotodeploy(8th
) Icon. Select
Project E2Hello4JB add to your application server jBoss.
-//sun microsystem, Inc.//DTD Enterprise JavaBeans 3.0
--: Create client Project for EJB :-
1. Create a “Java Project” E2client4JB.
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) Icon. Select
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) Icon. Select

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Example:-
File required:-
1. HelloRemote.java
2. HelloBean.java
3. HelloHome.java
4. Ejb-jar.xml
5. Jboss.xml
6. HelloClient.java
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Example:-
File required:-
1. HelloRemote.java
2. HelloBean.java
3. HelloHome.java
4. Ejb-jar.xml
5. Jboss.xml
6. HelloClient.java
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Example:-
File required:-
1. HelloRemote.java
2. HelloBean.java
3. HelloHome.java
4. Ejb-jar.xml
5. Jboss.xml
6. HelloClient.java

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1. HelloHome.java
package com.jtcindia.ejb2;
importjava.rmi.*;
importjavax.ejb.*;
publicinterfaceHelloHomeextendsEJBHome{
publicHelloRemote create() throws createException,
RemoteException;
}
2. HelloRemote.java
importjava.rmi.*;
importjavax.ejb.EJBObject;
publicinterfaceHelloRemoteextendsEJBObject{
public String getMessage(String name)
throwsRemoteException;
}
3. HelloBean.java
importjavax.ejb.*;
publicclassHelloBeanextendsSessionBean{
SessionContentsc=null;
Public void setSessionContent(SessionContentsc){
System.out.println("setSesssionContent");
this.sc=sc;

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}
Public void ejbActivate(){
System.out.println("ejbActivate");
}
publicvoidejbPassivate(){
System.out.println("ejbPassivate()");
}
publicvoidejbRemove(){
System.out.println("ejbReamove");
}
publicvoidejbCreate(){
System.out.println("ejbCreate()");
}
publicStringgetMessage(String name){
String msg="Hi"+name+"welcome to JTC EJB with
JBOSS";
System.out.println(msg);
returnmsg;
}
}
4. HelloClient.java
importjava.util.*;
importjavax.naming.*;
public classHelloClient {
publicstaticvoid main(String[] args) {
try{
Properties p=newProperties();

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p.put("java.naming.factory.initial","org.jnp.interf
aces.NamingContentFactory");
p.put("java.naming.provider.url","localhost:1099");
p.put("java.naming.factory.url.package","org.jboss.
naming");
Contentctx=newInitialContext(p);
Object o=ctx.lookup("JTCHelloHomeJNDI");
HelloHomehh=(HelloHome)o;
HelloRemotehr=hh.create();
String msg=hr.getMessage("Som");
msg=hr.getMessage("Som");
}catch(Exception e){
}
}
}
5. ejb-jar.xml
<?xmlversion="1.0"encoding="UTF-8"?>
<!DOCTYPEejb-jarPUBLIC"-//Sun MicroSystem,INC.//DTD
Enterprise JavaBean
2.0//EN","http://Java.sun.com/dtd/ejb-jar_2_0.dtd">
<ejb-jar>
<enterprise-beans>
<session>
<ejb-name>HelloEJB</ejb-name>
<home>com.jtcindia.ejb2.HelloHome</home>
<remote>com.jtcindia.ejb2.HelloRemote</remote>

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<ejb-class>com.jtcindia.ejb2.HelloBean</ejb-class>
<session-type>Stateless</session-type>
<trasaction-type>Container</trasaction-type>
</session>
</enterprise-beans>
</ejb-jar>
6. jboss.xml
<jboss>
<enterprise-beans>
<session>
<ejb-name>HelloEJB</ejb-name>
<jndi-name>JTCHelloHomeJNDI</jndi-name>
</session>
</enterprise-beans>
</jboss>

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