EJB3 and Servlets

[espenra]

Are there any tutorials on how to run a servlet with EJB 3.0 on JBoss?

[bill.burke]

Should be the same as EJB 2.1.

Bill

[espenra]

Well there is some difference to the deployment descriptors. I have mostly tried forward and backward, and ended up with something like this to test with. It will deploy without errors, but I got no clue what the url is like. I have tried out http://localhost:8080/stateless/hello for no good.

Any1 that see my error?


web.xml

<web-app>

 <ejb-server>
 <jndi-name>java:comp/env/ejb</jndi-name>
 <bean-type>HelloBean</bean-type>
 </ejb-server>

 <servlet>
 <servlet-name>hello</servlet-name>
 <servlet-class>HelloServlet</servlet-class>
 </servlet>

 <servlet-mapping>
 <servlet-name>hello</servlet-name>
 <url-pattern>/stateless</url-pattern>
 <servlet-class>HelloServlet</servlet-class>
 </servlet-mapping>
</web-app>

Hello.java

/**
 * Interface for the Hello session.
 */
public interface Hello {
 /**
 * Returns a hello, world string.
 */
 public String hello();
}

HelloBean.java

import javax.ejb.Stateless;
import javax.ejb.Inject;


/**
 * Implementation of the Hello bean.
 */
@Stateless
public class HelloBean implements Hello {
 private String _greeting = "Default Hello";

 /**
 * Injector to set the greeting.
 */
 @Inject
 public void setGreeting(String greeting)
 {
 _greeting = greeting;
 }

 /**
 * Returns a hello, world string.
 */
 public String hello()
 {
 return _greeting;
 }
}

HelloServlet.java

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.GenericServlet;
import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import javax.ejb.EJB;

public class HelloServlet extends HttpServlet {
 private Hello _hello;

 /**
 * Dependency injector for the Hello interface.
 */
 @EJB(name="HelloBean")
 public void setHello(Hello hello)
 {
 _hello = hello;
 }

 public void service(HttpServletRequest req, HttpServletResponse res)
 throws IOException, ServletException
 {
 PrintWriter out = res.getWriter();

 if (_hello == null) {
 out.println("This example requires JDK 1.5");
 return;
 }

 out.println(_hello.hello());
 }
}

[bill.burke]

look up how to do ejb-refs. I don't know if it will work, but just put the remote/local interface in the local-home/remote-home tags...If all else fails, just look up the beans in JNDI directly.

new InitialContext().lookup(YouBeanRemote.class.getName());

or

InitialContext().lookup(YouBeanLocal.class.getName());

[espenra]

I skipped your first advice, and did your last one

new InitialContext().lookup(YouBeanRemote.class.getName());

and it worked!

Thanx