Misterious Problem invoking remote EJB3 on WAS 7

[ismael cabanas]

Hi, i apology about my english.

I am trying with EJB 3 technology. I have two ears applications, one of them is a web application and the other one is an application with remote EJBs, using EJB 3.0. I deploy them in the same server, Websphere 7, and they start succesfully. My test is invoking EJBs through @EJB annotation and through "lookup", then, the web application has a Servlet with a reference at EJB through @EJB annotation, and other reference at remote interface, i.e.

import org.icabanas.pruebaconcepto.dominio.Producto;
import org.icabanas.pruebaconcepto.facade.ProductoSessionFacade;

public class ProductoServlet extends HttpServlet {

	@EJB(name="EJB/ProductoSessionFacade")
	private ProductoSessionFacade productoSessionFacade;
	
	private ProductoSessionFacade productoSessionFacadeJndi;	

        protected void doPost(HttpServletRequest req, HttpServletResponse resp)
			throws ServletException, IOException {
		Producto producto = getProductoFromRequest(req);
		
		try{
			System.out.println("INJECTION");
			productoSessionFacade.alta(producto);
		}
		catch (Exception e) {
			System.out.println("Error in INJECTION");
			System.out.println(e.getMessage());
		}
		
		try{
			System.out.println("JNDI");			
			productoSessionFacadeJndi = (ProductoSessionFacade) lookupJNDI("org.icabanas.pruebaconcepto.facade.ProductoSessionFacade");
			productoSessionFacadeJndi.alta(producto);
		}
		catch (Exception e) {
			System.out.println("Error in JNDI");
			System.out.println(e.getMessage());
		}
	}
.......
}

I have the following problem: When i start the applications all works fine, i get the EJB annoted and through jndi lookup, but when i restart or republish the ear containing web application, i get the EJB annonted and it works fine, but when i try to get the EJB through JNDI lookup i get the following error:

"org.icabanas.pruebaconcepto.facade._ProductoSessionFacade_Stub incompatible with org.icabanas.pruebaconcepto.facade.ProductoSessionFacade"

Any idea about what happen?

Thanks in advanced!

[massimiliano cattaneo]

If I correctly undertood the EJB is in a ear different from the JSP so You should Try this

java:global[/<app-name>]/<modulename>/<bean-name>[!<fullyqualified-interface-name>]

where app_name is the ear name, modulename is the EJB-JAR name, bean-name is the name of the bean, fully qualified name is the fully qualified name of your bean/interface. In this case the remote interface

for example
java:global/testEAR/testEJB/beanName!com.test.SessionRemote

I hope this can help

[ismael cabanas]

Hi Massimiliano, you understand me perfectly.

I tried lookup with "java:global/prueba-concepto-ejbs-ear/prueba-concepto-ejbs/ProductoSessionFacadeEjb!org.icabanas.pruebaconcepto.facade.ProductoSessionFacade"

but i get the following exception:

[4/01/12 12:56:51:961 CET] 0000001b SystemErr R javax.naming.NameNotFoundException: Name global not found in context "java:".

[ismael cabanas]

I continue with my problem....

With the following jndi name "ejb/prueba-concepto-ejbs-ear/prueba-concepto-ejbs.jar/ProductoSessionFacadeEjb#org.icabanas.pruebaconcepto.facade.ProductoSessionFacade" i get the EJB, but if i restart the EAR containing the web application (the client application of the EJBs, they are in other EAR deploy on the same server), when i try get the EJB by lookup, i get the following exception

[4/01/12 13:22:05:616 CET] 0000001b SystemErr R java.lang.ClassCastException: org.icabanas.pruebaconcepto.facade._ProductoSessionFacade_Stub incompatible with org.icabanas.pruebaconcepto.facade.ProductoSessionFacade
[4/01/12 13:22:05:616 CET] 0000001b SystemErr R at org.icabanas.pruebaconcepto.web.servlet.ProductoServlet.doPost(ProductoServlet.java:55)
[4/01/12 13:22:05:616 CET] 0000001b SystemErr R at javax.servlet.http.HttpServlet.service(HttpServlet.java:738)
[4/01/12 13:22:05:616 CET] 0000001b SystemErr R at javax.servlet.http.HttpServlet.service(HttpServlet.java:831)
[4/01/12 13:22:05:616 CET] 0000001b SystemErr R at com.ibm.ws.webcontainer.servlet.ServletWrapper.service(ServletWrapper.java:1657)
[4/01/12 13:22:05:616 CET] 0000001b SystemErr R at com.ibm.ws.webcontainer.servlet.ServletWrapper.handleRequest(ServletWrapper.java:939)
[4/01/12 13:22:05:616 CET] 0000001b SystemErr R at com.ibm.ws.webcontainer.servlet.ServletWrapper.handleRequest(ServletWrapper.java:502)
[4/01/12 13:22:05:616 CET] 0000001b SystemErr R at com.ibm.ws.webcontainer.servlet.ServletWrapperImpl.handleRequest(ServletWrapperImpl.java:179)
[4/01/12 13:22:05:616 CET] 0000001b SystemErr R at com.ibm.ws.webcontainer.webapp.WebApp.handleRequest(WebApp.java:3933)
[4/01/12 13:22:05:616 CET] 0000001b SystemErr R at com.ibm.ws.webcontainer.webapp.WebGroup.handleRequest(WebGroup.java:276)
[4/01/12 13:22:05:616 CET] 0000001b SystemErr R at com.ibm.ws.webcontainer.WebContainer.handleRequest(WebContainer.java:931)
[4/01/12 13:22:05:616 CET] 0000001b SystemErr R at com.ibm.ws.webcontainer.WSWebContainer.handleRequest(WSWebContainer.java:1583)
[4/01/12 13:22:05:616 CET] 0000001b SystemErr R at com.ibm.ws.webcontainer.channel.WCChannelLink.ready(WCChannelLink.java:186)
[4/01/12 13:22:05:616 CET] 0000001b SystemErr R at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleDiscrimination(HttpInboundLink.java:445)
[4/01/12 13:22:05:616 CET] 0000001b SystemErr R at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleNewRequest(HttpInboundLink.java:504)
[4/01/12 13:22:05:616 CET] 0000001b SystemErr R at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.processRequest(HttpInboundLink.java:301)
[4/01/12 13:22:05:616 CET] 0000001b SystemErr R at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.ready(HttpInboundLink.java:275)
[4/01/12 13:22:05:616 CET] 0000001b SystemErr R at com.ibm.ws.tcp.channel.impl.NewConnectionInitialReadCallback.sendToDiscriminators(NewConnectionInitialReadCallback.java:214)
[4/01/12 13:22:05:616 CET] 0000001b SystemErr R at com.ibm.ws.tcp.channel.impl.NewConnectionInitialReadCallback.complete(NewConnectionInitialReadCallback.java:113)
[4/01/12 13:22:05:616 CET] 0000001b SystemErr R at com.ibm.ws.tcp.channel.impl.AioReadCompletionListener.futureCompleted(AioReadCompletionListener.java:165)
[4/01/12 13:22:05:616 CET] 0000001b SystemErr R at com.ibm.io.async.AbstractAsyncFuture.invokeCallback(AbstractAsyncFuture.java:217)
[4/01/12 13:22:05:616 CET] 0000001b SystemErr R at com.ibm.io.async.AsyncChannelFuture.fireCompletionActions(AsyncChannelFuture.java:161)
[4/01/12 13:22:05:616 CET] 0000001b SystemErr R at com.ibm.io.async.AsyncFuture.completed(AsyncFuture.java:138)
[4/01/12 13:22:05:616 CET] 0000001b SystemErr R at com.ibm.io.async.ResultHandler.complete(ResultHandler.java:204)
[4/01/12 13:22:05:616 CET] 0000001b SystemErr R at com.ibm.io.async.ResultHandler.runEventProcessingLoop(ResultHandler.java:775)
[4/01/12 13:22:05:616 CET] 0000001b SystemErr R at com.ibm.io.async.ResultHandler$2.run(ResultHandler.java:905)
[4/01/12 13:22:05:616 CET] 0000001b SystemErr R at com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java:1604)

[massimiliano cattaneo]

Hello,
Sorry WAS 7 is J2EE 5 compiant not 6 this is why global doesn't work.

[ismael cabanas]

Please, i need some help. I am going to expose my problem in other way:

Hi, i have two ears deployed in the same server, Websphere 7. One EAR contain my EJBs3 and the other EAR contain a web application, and i want to try to call remote EJBs through annontation and JNDI lookup.

In the web application EAR, i have the following Servlet:

package org.icabanas.pruebaconcepto.web.servlet;

import java.io.IOException;

import javax.ejb.EJB;
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.icabanas.pruebaconcepto.dominio.Producto;
import org.icabanas.pruebaconcepto.facade.ProductoSessionFacade;

@SuppressWarnings("serial")
public class ProductoServlet extends HttpServlet {

	@EJB(name="EJB/ProductoSessionFacade")
	private ProductoSessionFacade productoSessionFacade;
	
	private ProductoSessionFacade productoSessionFacadeJndi;	
	
	@Override
	protected void doGet(HttpServletRequest req, HttpServletResponse resp)
			throws ServletException, IOException {
		String path = req.getRequestURI();
		
		if(path.indexOf("/producto/index") != -1){
			req.getRequestDispatcher("/WEB-INF/jsp/producto/index.jsp").forward(req, resp);			
		}
		else if(path.indexOf("/producto/alta") != -1){
			req.getRequestDispatcher("/WEB-INF/jsp/producto/alta.jsp").forward(req, resp);
		}		
	}

	@Override
	protected void doPost(HttpServletRequest req, HttpServletResponse resp)
			throws ServletException, IOException {
		Producto producto = obtenerProductoDeRequest(req);
		
		try{
			System.out.println("INYECCIÓN");
			productoSessionFacade.alta(producto);
		}
		catch (Exception e) {
			System.out.println("Error en INYECCIÓN");
			System.out.println(e.getMessage());
		}
		
		try{
			System.out.println("JNDI");
			//productoSessionFacadeJndi = (ProductoSessionFacade) buscarJndi("ejb/prueba-concepto-ejbs-ear/prueba-concepto-ejbs.jar/ProductoSessionFacadeEjb#org.icabanas.pruebaconcepto.facade.ProductoSessionFacade");
			//productoSessionFacadeJndi = (ProductoSessionFacade) buscarJndi("ejb/prueba-concepto-ejbs-ear/prueba-concepto-ejbs.jar/ProductoSessionFacadeEjb#org.icabanas.pruebaconcepto.facade.ProductoSessionFacade");
			productoSessionFacadeJndi = (ProductoSessionFacade) buscarJndi("java:comp/env/EJB/ProductoSessionFacade");
			productoSessionFacadeJndi.alta(producto);
		}
		catch (Exception e) {
			System.out.println("Error en JNDI");
			System.out.println(e.getMessage());
			e.printStackTrace();
		}
	}

	private Producto obtenerProductoDeRequest(HttpServletRequest request){
		Producto producto;
		
		String nombre = request.getParameter("nombre");
		String descripcion = request.getParameter("descripcion");
		
		producto = new Producto(nombre, descripcion);
		
		return producto;
	}
	
	private Object buscarJndi(String jndiName){
		try{
			Context ctx = new InitialContext();
			return ctx.lookup(jndiName);
		}
		catch (NamingException e) {
			e.printStackTrace();
			System.out.println(e.getMessage());
		}
		return null;
	}
	
}

And, in the EAR containing EJBs i have the following Session Stateless bean and his remote interface:

package org.icabanas.pruebaconcepto.facade.impl.ejb;

import javax.ejb.Stateless;

import org.icabanas.pruebaconcepto.dominio.Producto;
import org.icabanas.pruebaconcepto.facade.ProductoSessionFacade;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

@Stateless
public class ProductoSessionFacadeEjb implements ProductoSessionFacade{

	private static final Logger logger = LoggerFactory.getLogger(ProductoSessionFacadeEjb.class);
	
	@Override
	public void alta(Producto producto) {
		logger.info("Dar de alta el producto.");
	}

	
}

package org.icabanas.pruebaconcepto.facade;

import javax.ejb.Remote;

import org.icabanas.pruebaconcepto.dominio.Producto;

@Remote
public interface ProductoSessionFacade {
	
	void alta(Producto producto);
}

Ok, if i deploy the two ears in the server and execute the servlet, it works well, i get the EJBs by the two ways (annontation and JNDI lookup), and i get the expected trace (a simple text in the console):

00000019 servlet       I com.ibm.ws.webcontainer.servlet.ServletWrapper init SRVE0242I: [prueba-concepto-ejbs-web-ear] [/prueba-concepto-ejbs-web] [Producto Servlet]: Inicialización satisfactoria.
00000019 SystemOut     O INYECCIÓN
00000019 SystemOut     O JNDI
00000019 SystemErr     R 156 [WebContainer : 0] INFO org.icabanas.pruebaconcepto.facade.impl.ejb.ProductoSessionFacadeEjb - Dar de alta el producto.
00000019 SystemErr     R 156 [WebContainer : 0] INFO org.icabanas.pruebaconcepto.facade.impl.ejb.ProductoSessionFacadeEjb - Dar de alta el producto.

But now, if i restart the EAR containing de web application, it doesn't work fine, i get the EJB annotated but i can't get the EJB through JNDI lookup and get the following trace:

[5/01/12 15:00:38:961 CET] 0000001a servlet       I com.ibm.ws.webcontainer.servlet.ServletWrapper init SRVE0242I: [prueba-concepto-ejbs-web-ear] [/prueba-concepto-ejbs-web] [Producto Servlet]: Inicialización satisfactoria.
[5/01/12 15:00:38:961 CET] 0000001a SystemOut     O INYECCIÓN
[5/01/12 15:00:38:977 CET] 0000001a SystemOut     O JNDI
[5/01/12 15:00:38:977 CET] 0000001a SystemOut     O Error en JNDI
[5/01/12 15:00:38:977 CET] 0000001a SystemOut     O org.icabanas.pruebaconcepto.facade._ProductoSessionFacade_Stub incompatible with org.icabanas.pruebaconcepto.facade.ProductoSessionFacade
[5/01/12 15:00:38:977 CET] 0000001a SystemErr     R 197753 [WebContainer : 1] INFO org.icabanas.pruebaconcepto.facade.impl.ejb.ProductoSessionFacadeEjb - Dar de alta el producto.
[5/01/12 15:00:38:977 CET] 0000001a SystemErr     R java.lang.ClassCastException: org.icabanas.pruebaconcepto.facade._ProductoSessionFacade_Stub incompatible with org.icabanas.pruebaconcepto.facade.ProductoSessionFacade
[5/01/12 15:00:38:977 CET] 0000001a SystemErr     R 	at org.icabanas.pruebaconcepto.web.servlet.ProductoServlet.doPost(ProductoServlet.java:56)
[5/01/12 15:00:38:977 CET] 0000001a SystemErr     R 	at javax.servlet.http.HttpServlet.service(HttpServlet.java:738)
[5/01/12 15:00:38:977 CET] 0000001a SystemErr     R 	at javax.servlet.http.HttpServlet.service(HttpServlet.java:831)
[5/01/12 15:00:38:977 CET] 0000001a SystemErr     R 	at com.ibm.ws.webcontainer.servlet.ServletWrapper.service(ServletWrapper.java:1657)
[5/01/12 15:00:38:977 CET] 0000001a SystemErr     R 	at com.ibm.ws.webcontainer.servlet.ServletWrapper.handleRequest(ServletWrapper.java:939)
[5/01/12 15:00:38:977 CET] 0000001a SystemErr     R 	at com.ibm.ws.webcontainer.servlet.ServletWrapper.handleRequest(ServletWrapper.java:502)
[5/01/12 15:00:38:977 CET] 0000001a SystemErr     R 	at com.ibm.ws.webcontainer.servlet.ServletWrapperImpl.handleRequest(ServletWrapperImpl.java:179)
[5/01/12 15:00:38:977 CET] 0000001a SystemErr     R 	at com.ibm.ws.webcontainer.webapp.WebApp.handleRequest(WebApp.java:3933)
[5/01/12 15:00:38:977 CET] 0000001a SystemErr     R 	at com.ibm.ws.webcontainer.webapp.WebGroup.handleRequest(WebGroup.java:276)
[5/01/12 15:00:38:977 CET] 0000001a SystemErr     R 	at com.ibm.ws.webcontainer.WebContainer.handleRequest(WebContainer.java:931)
[5/01/12 15:00:38:977 CET] 0000001a SystemErr     R 	at com.ibm.ws.webcontainer.WSWebContainer.handleRequest(WSWebContainer.java:1583)
[5/01/12 15:00:38:977 CET] 0000001a SystemErr     R 	at com.ibm.ws.webcontainer.channel.WCChannelLink.ready(WCChannelLink.java:186)
[5/01/12 15:00:38:977 CET] 0000001a SystemErr     R 	at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleDiscrimination(HttpInboundLink.java:445)
[5/01/12 15:00:38:977 CET] 0000001a SystemErr     R 	at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleNewRequest(HttpInboundLink.java:504)
[5/01/12 15:00:38:977 CET] 0000001a SystemErr     R 	at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.processRequest(HttpInboundLink.java:301)
[5/01/12 15:00:38:977 CET] 0000001a SystemErr     R 	at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.ready(HttpInboundLink.java:275)
[5/01/12 15:00:38:977 CET] 0000001a SystemErr     R 	at com.ibm.ws.tcp.channel.impl.NewConnectionInitialReadCallback.sendToDiscriminators(NewConnectionInitialReadCallback.java:214)
[5/01/12 15:00:38:977 CET] 0000001a SystemErr     R 	at com.ibm.ws.tcp.channel.impl.NewConnectionInitialReadCallback.complete(NewConnectionInitialReadCallback.java:113)
[5/01/12 15:00:38:977 CET] 0000001a SystemErr     R 	at com.ibm.ws.tcp.channel.impl.AioReadCompletionListener.futureCompleted(AioReadCompletionListener.java:165)
[5/01/12 15:00:38:977 CET] 0000001a SystemErr     R 	at com.ibm.io.async.AbstractAsyncFuture.invokeCallback(AbstractAsyncFuture.java:217)
[5/01/12 15:00:38:977 CET] 0000001a SystemErr     R 	at com.ibm.io.async.AsyncChannelFuture.fireCompletionActions(AsyncChannelFuture.java:161)
[5/01/12 15:00:38:977 CET] 0000001a SystemErr     R 	at com.ibm.io.async.AsyncFuture.completed(AsyncFuture.java:138)
[5/01/12 15:00:38:977 CET] 0000001a SystemErr     R 	at com.ibm.io.async.ResultHandler.complete(ResultHandler.java:204)
[5/01/12 15:00:38:977 CET] 0000001a SystemErr     R 	at com.ibm.io.async.ResultHandler.runEventProcessingLoop(ResultHandler.java:775)
[5/01/12 15:00:38:977 CET] 0000001a SystemErr     R 	at com.ibm.io.async.ResultHandler$2.run(ResultHandler.java:905)
[5/01/12 15:00:38:977 CET] 0000001a SystemErr     R 	at com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java:1604)

What's wrong?, any idea?

Thanks in advanced!

[Dmitry Klochkov]

Hello, Ismael. I am now experiencing similar problem. I periodically get ClassCastException while doing remote lookup between two different EAR's on the same jvm. Have you found a solution?