Ciao raga stò da poco lavorando in ambito web application con Eclipse oggi ho provato a replicare l'esempio riportato qui :http://live.eclipse.org/node/572 con application server GlassFish v2.1 Java EE ma non funziona.
Non so se ho mancato di configurare qualcosa in Eclipse.
(posso solo dire che la voce in project explore della mia webApplication:

CiaoWeb->References è vuota.
Mentre nel tutorial c'è tutto il path per arrivare alla servlet.
nel mio caso dovrebbe essere
ciao.prj.CiaoServlet/Hello
In particolare ho creato un EJB project eccolo:

codice:
// Hello.java
package mio.prj;
import javax.ejb.Local;

@Local
public interface Hello {
	public String sayHello(String s);
}



//HelloBean

package mio.prj;

import javax.ejb.Stateless;

/**
 * Session Bean implementation class HelloBean
 */
@Stateless
public class HelloBean implements Hello {

    /**
     * Default constructor. 
     */
    public HelloBean() {
        // TODO Auto-generated constructor stub
    }

	@Override
	public String sayHello(String s) {
		// TODO Auto-generated method stub
		return "Ciao "+s+" !!!";
	}

}
e una webApplication con una servlet CiaoServlet;
eccola:
codice:
package mio.prj;

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * Servlet implementation class CiaoServlet
 */
public class CiaoServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;
       
	Hello h;
    /**
     * @see HttpServlet#HttpServlet()
     */
    public CiaoServlet() {
        super();
        // TODO Auto-generated constructor stub
    }

	/**
	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		String name=request.getParameter("name");
		response.getOutputStream().println(h.sayHello(name));
	}

}
Ecco il log di GlassFish:
codice:
INFO: classLoader = WebappClassLoader
  delegate: true
  repositories:
    /WEB-INF/classes/
----------> Parent Classloader:
EJBClassLoader : 
urlSet = []
doneCalled = false 
 Parent -> java.net.URLClassLoader@1a2f02e

INFO: SharedSecrets.getJavaNetAccess()=java.net.URLClassLoader$7@554acb

GRAVE: Class [ Lmio/prj/Hello; ] not found. Error while loading [ class mio.prj.CiaoServlet ]
AVVERTENZA: Error in annotation processing: java.lang.NoClassDefFoundError: Lmio/prj/Hello;
INFO: deployed with moduleid = CiaoWeb

GRAVE: StandardWrapperValve[Ciao]: PWC1406: Servlet.service() for servlet Ciao threw exception
java.lang.NoClassDefFoundError: mio/prj/Hello
	at mio.prj.CiaoServlet.doGet(CiaoServlet.java:29)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:734)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:847)
	at org.apache.catalina.core.ApplicationFilterChain.servletService(ApplicationFilterChain.java:427)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:315)
	at org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:287)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:218)
	at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:648)
	at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:593)
	at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:94)
	at com.sun.enterprise.web.PESessionLockingStandardPipeline.invoke(PESessionLockingStandardPipeline.java:98)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:222)
	at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:648)
	at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:593)
	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:587)
	at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:1096)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:166)
	at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:648)
	at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:593)
	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:587)
	at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:1096)
	at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:288)
	at com.sun.enterprise.web.connector.grizzly.DefaultProcessorTask.invokeAdapter(DefaultProcessorTask.java:647)
	at com.sun.enterprise.web.connector.grizzly.DefaultProcessorTask.doProcess(DefaultProcessorTask.java:579)
	at com.sun.enterprise.web.connector.grizzly.DefaultProcessorTask.process(DefaultProcessorTask.java:831)
	at com.sun.enterprise.web.connector.grizzly.DefaultReadTask.executeProcessorTask(DefaultReadTask.java:341)
	at com.sun.enterprise.web.connector.grizzly.DefaultReadTask.doTask(DefaultReadTask.java:263)
	at com.sun.enterprise.web.connector.grizzly.DefaultReadTask.doTask(DefaultReadTask.java:214)
	at com.sun.enterprise.web.portunif.PortUnificationPipeline$PUTask.doTask(PortUnificationPipeline.java:380)
	at com.sun.enterprise.web.connector.grizzly.TaskBase.run(TaskBase.java:265)
	at com.sun.enterprise.web.connector.grizzly.ssl.SSLWorkerThread.run(SSLWorkerThread.java:106)
Caused by: java.lang.ClassNotFoundException: mio.prj.Hello
	at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1576)
	at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
	... 31 more
Datemi una mano .....