Creating and testing the "Hello World"
Example is the very first step towards learning of any application or
programming language. In the given example we are going to show you, how to
create your first hello world example in EJB and testing it.
You can also create a hello world example to test your
EJB environment setup. This simple application will required three different
files to print the message.
- SessionBeanRemote.java:- This is
the Remote interface which extends javax.ejb.EJBObject package. These
are similar to RMI Remote interface. The use of remote interface is
particularly helpful in providing business-specific functionality of an
EJB.Here @Remote is the annotation used to declare the interface as
Remote.
String getAddress(); String getCompanyname(); String getResult():-These
are the methods which is to be defined in the bean.
2. SessionBeanBean.java:-This
is the bean of type session in which we have defined the body of the
method which were declared in
the
interface named
SessionBeanRemote.java.@Stateless is the annotation used to declare the
bean as a session type.
3. Main.java:-This is the
client application from which we can access the methods which are defined
in the bean.@EJB is the
annotation
used for
configuring the EJB values for a field and method.
SessionBeanRemote.java
package ejb;
import javax.ejb.Remote;
@Remote
public interface SessionBeanRemote {
String getResult();
String getAddress();
String getCompanyname();
}
|
SessionBeanBean.java
package ejb;
import javax.ejb.Stateless;
@Stateless
public class SessionBeanBean implements SessionBeanRemote,SessionBeanLocal {
public String getResult() {
return "Hello World";
}
public String getAddress() {
return "Sec-3,D-16/116,Rohini";
}
public String getCompanyname() {
return "Roseindia.net Pvt.Ltd.";
}
}
|
Main.java
package enterpriseappee5;
import ejb.SessionBeanRemote;
import javax.ejb.EJB;
public class Main {
@EJB
private static SessionBeanRemote sessionBeanBean;
public static void main(String[] args) {
System.out.println("Displaying Message using EJB:");
System.out.println("=================================");
System.err.println("Name of the Company is : =" + sessionBeanBean.getCompanyname());
System.err.println("Address of the Company is : =" + sessionBeanBean.getAddress());
System.err.println("Message is : =" + sessionBeanBean.getResult());
System.out.println("=================================");
}
}
|
Output of the program
Displaying Message using EJB:
=================================
Name of the Company is : =Roseindia.net Pvt.Ltd.
Address of the Company is : =Sec-3,D-16/116,Rohini
Message is : =Hello World
=================================
|
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