[bartstanczyk]

Hi, I’m pretty new to EJB3 and I started doing this simple forum tutorial (http://www.informit.com/guides/content.asp?g=java&seqNum=239&rl=1)

I created an EAR and put the EJBs in the EJB module and the test servlet in the Web module. It deploys without errors, but when I invoke the getForums command I get an error.

I’ve been trying to fix this for about 5 days now. I hope someone can help me out here.

I know that the problem has to do with the ForumManager session bean.

I’m using MyEclipse 5/Eclipse 3.2 / Jboss 404 / MySQL

-Thanks in advance

stacktrace

21:59:31,197 ERROR [STDERR] javax.naming.NameNotFoundException: com.javasrc.forums.business.ForumManager not bound
21:59:31,197 ERROR [STDERR] at org.jnp.server.NamingServer.getBinding(NamingServer.java:529)
21:59:31,197 ERROR [STDERR] at org.jnp.server.NamingServer.getBinding(NamingServer.java:537)
21:59:31,217 ERROR [STDERR] at org.jnp.server.NamingServer.getObject(NamingServer.java:543)
21:59:31,217 ERROR [STDERR] at org.jnp.server.NamingServer.lookup(NamingServer.java:296)
21:59:31,217 ERROR [STDERR] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
21:59:31,217 ERROR [STDERR] at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
21:59:31,227 ERROR [STDERR] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
21:59:31,227 ERROR [STDERR] at java.lang.reflect.Method.invoke(Method.java:585)
21:59:31,227 ERROR [STDERR] at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:294)
21:59:31,227 ERROR [STDERR] at sun.rmi.transport.Transport$1.run(Transport.java:153)
21:59:31,227 ERROR [STDERR] at java.security.AccessController.doPrivileged(Native Method)
21:59:31,227 ERROR [STDERR] at sun.rmi.transport.Transport.serviceCall(Transport.java:149)
21:59:31,227 ERROR [STDERR] at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:466)
21:59:31,227 ERROR [STDERR] at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:707)
21:59:31,227 ERROR [STDERR] at java.lang.Thread.run(Thread.java:595)
21:59:31,227 ERROR [STDERR] at sun.rmi.transport.StreamRemoteCall.exceptionReceivedFromServer(StreamRemoteCall.java:247)
21:59:31,227 ERROR [STDERR] at sun.rmi.transport.StreamRemoteCall.executeCall(StreamRemoteCall.java:223)
21:59:31,227 ERROR [STDERR] at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:126)
21:59:31,227 ERROR [STDERR] at org.jnp.server.NamingServer_Stub.lookup(Unknown Source)
21:59:31,227 ERROR [STDERR] at org.jnp.interfaces.NamingContext.lookup(NamingContext.java:625)
21:59:31,227 ERROR [STDERR] at org.jnp.interfaces.NamingContext.lookup(NamingContext.java:587)
21:59:31,227 ERROR [STDERR] at javax.naming.InitialContext.lookup(InitialContext.java:351)
21:59:31,227 ERROR [STDERR] at com.javasrc.forums.web.ForumServlet.init(ForumServlet.java:39)
21:59:31,227 ERROR [STDERR] at javax.servlet.GenericServlet.init(GenericServlet.java:211)
21:59:31,227 ERROR [STDERR] at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1105)
21:59:31,227 ERROR [STDERR] at org.apache.catalina.core.StandardWrapper.allocate(StandardWrapper.java:757)
21:59:31,227 ERROR [STDERR] at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:130)
21:59:31,227 ERROR [STDERR] at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
21:59:31,227 ERROR [STDERR] at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:175)
21:59:31,227 ERROR [STDERR] at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:74)
21:59:31,227 ERROR [STDERR] at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
21:59:31,227 ERROR [STDERR] at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
21:59:31,227 ERROR [STDERR] at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
21:59:31,227 ERROR [STDERR] at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
21:59:31,227 ERROR [STDERR] at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869)
21:59:31,227 ERROR [STDERR] at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:664)
21:59:31,227 ERROR [STDERR] at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
21:59:31,227 ERROR [STDERR] at org.apache.tomcat.util.net.MasterSlaveWorkerThread.run(MasterSlaveWorkerThread.java:112)
21:59:31,227 ERROR [STDERR] at java.lang.Thread.run(Thread.java:595)
21:59:31,237 ERROR [[ForumServlet]] Servlet.service() for servlet ForumServlet threw exception
java.lang.NullPointerException
at com.javasrc.forums.web.ForumServlet.service(ForumServlet.java:57)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:175)
at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:74)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869)
at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:664)
at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
at org.apache.tomcat.util.net.MasterSlaveWorkerThread.run(MasterSlaveWorkerThread.java:112)
at java.lang.Thread.run(Thread.java:595)

ForumServlet.java

package com.javasrc.forums.web;

// Import the servlet classes
import javax.servlet.*;
import javax.servlet.http.*;

// Import the standard Java classes
import java.io.*;
import java.util.*;

// Import the EJB classes
import javax.naming.*;
import javax.ejb.*;

// Import our EJBs (stateless session and entity)
import com.javasrc.forums.business.*;
import com.javasrc.forums.entity.*;

public class ForumServlet extends HttpServlet {
/**
*
*/
private static final long serialVersionUID = -3182140332587612047L;

public void init() {
// Load a reference to the ForumManager the first time this Servlet
// is invoked
ServletContext ctx = getServletContext();

ForumManager fm = (ForumManager) ctx.getAttribute(“forums”);
if (fm == null) {
try {
// Lookup a reference to the ForumManager EJB and save it
// in the application scope attribute “forum-manager”
InitialContext ic = new InitialContext();
fm = (ForumManager) ic.lookup(ForumManager.class.getName());
ctx.setAttribute(“forums”, fm);
} catch (Exception e) {
e.printStackTrace();
}
}
}

public void service(HttpServletRequest req, HttpServletResponse res)
throws ServletException {
try {
// Simple debug interface: write HTML Strings to the response
PrintWriter out = res.getWriter();
out.println(“<html><head><title>Forums</title><head><body>”);

// Load our ForumManager EJB
ServletContext ctx = getServletContext();
ForumManager fm = (ForumManager) ctx.getAttribute(“forums”);

String command = req.getParameter(“cmd”);
if (command == null)
command = “getForums”;

// Add a new forum
if (command.equalsIgnoreCase(“addForum”)) {
String forumName = req.getParameter(“name”);
String forumDescription = req.getParameter(“desc”);
System.out.println(“Adding forum: ” + forumName + “, ”
+ forumDescription);
fm.addForum(forumName, forumDescription);
out.println(“Added forum ” + forumName);
}

// Return a list of all forums
else if (command.equalsIgnoreCase(“getForums”)) {
out.println(“<h3>Forums</h3>”);
//Collection<ForumBean> forums = fm.getForums();
out.println(“<table width=\”90%\” align=\”center\”>”);
for (ForumBean forum : forums) {
out
.println(“<tr><td width=’20%’><a href=’forum?cmd=getTopics\”forumName=”
+ forum.getName()
+ “‘>”
+ forum.getName()
+ “</a></td><td>”
+ forum.getDescription()
+ “</td></tr>”);
}
out.println(“</table>”);
out.println(“Forums should be here”);
}

// Return a list of all topics for a specified forum
else if (command.equalsIgnoreCase(“getTopics”)) {
String forumName = req.getParameter(“forumName”);
Collection<TopicBean> topics = fm.getTopics(forumName);
if (topics.size() == 0) {
System.out
.println(“No topics exist for forum ” + forumName);
} else {
out.println(“<h3>” + forumName + ” Topics (”
+ topics.size() + “)</h3>”);
// out.println( “<b>Topics found for forum ” + forumName +
// “: ” + topics.size() );
out.println(“<table width=’90%’ align=’center’>”);
for (TopicBean topic : topics)

{
out.println(“<tr><td width=’20%’>”
+ “<a href=’forum?cmd=getMessages\”forumName=”
+ forumName + “\”topicName=” + topic.getName()
+ “‘>” + topic.getName() + “</a></td><td>”
+ topic.getDescription() + “</td></tr>”);
}
out.println(“</table>”);
}
}

// Add a new topic to a forum
else if (command.equalsIgnoreCase(“addTopicToForum”)) {
String forumName = req.getParameter(“forumName”);
String topicName = req.getParameter(“topicName”);
String topicDescription = req.getParameter(“desc”);
System.out.println(“Adding topic ” + topicName + ” to ”
+ forumName + “: ” + topicDescription);
fm.addTopicToForum(topicName, forumName, topicDescription);
out.println(“Added topic ” + topicName + ” to forum ”
+ forumName);
}

// Add a new user to the system
else if (command.equalsIgnoreCase(“addUser”)) {
String name = req.getParameter(“name”);
String login = req.getParameter(“login”);
String password = req.getParameter(“password”);
fm.addUser(name, login, password);
out.println(“Successfully added new user ” + name
+ ” with login id ” + login);
}

// Post a message to a topic
else if (command.equalsIgnoreCase(“postMessage”)) {
String forumName = req.getParameter(“forumName”);
String topicName = req.getParameter(“topicName”);
String login = req.getParameter(“login”);
String title = req.getParameter(“title”);
String body = req.getParameter(“body”);
fm.postMessage(forumName, topicName, login, title, body);
out.println(“Successfully added message ” + title
+ ” to forum ” + forumName + “, topic ” + topicName);
}

// Get messages
else if (command.equalsIgnoreCase(“getMessages”)) {
String forumName = req.getParameter(“forumName”);
String topicName = req.getParameter(“topicName”);
Collection<MessageBean> messages = fm.getMessages(forumName,
topicName);
out.println(“<h3>” + forumName + ” / ” + topicName
+ ” Messages (” + messages.size() + “)</h3>”);
out.println(“<table width=\”90%\” align=\”center\”>”);
for (MessageBean message : messages) {
out
.println(“<tr><td width=’20%’><a href=’forum?cmd=getMessage\”id=”
+ message.getId()
+ “‘>”
+ message.getTitle()
+ “</a></td><td>”
+ message.getTimestamp() + “</td></tr>”);
}
out.println(“</table>”);
}

else if (command.equalsIgnoreCase(“getMessage”)) {
String messageId = req.getParameter(“id”);
int id = Integer.parseInt(messageId);
MessageBean message = fm.getMessage(id);
StringBuffer sb = new StringBuffer(
“<table width=\”90%\” align=\”center\”>”);
sb.append(“<tr><td><b>Title:</b> ” + message.getTitle()
+ “</td></tr>”);
sb.append(“<tr><td><b>User:</b> ”
+ message.getUserBean().getName() + “</td></tr>”);
sb.append(“<tr><td><b>Date:</b> ” + message.getTimestamp()
+ “</td></tr>”);
sb.append(“<tr><td>” + message.getBody() + “</td></tr>”);
sb.append(“</table>”);
out.println(sb.toString());
}

out.println(“</body></html>”);
} catch (Exception e) {
throw new ServletException(e);
}
}
}

[Riyad Kalla]

Moving to OT > Soft Dev, seems to be a naming/configuration issue.

21:59:31,197 ERROR [STDERR] javax.naming.NameNotFoundException: com.javasrc.forums.business.ForumManager not bound

Focus on fixing this first. I haven’t done any JEE 5/EJB projects yet so I’m not farmiliar with our you register the beans with specific names, do you have that code handy?

The way you are looking up the bean now looks a little strange:

InitialContext ic = new InitialContext();
fm = (ForumManager) ic.lookup(ForumManager.class.getName());
ctx.setAttribute(“forums”, fm);

Normally your lookup string is something like “ejb/MyBean” or something like that. But then again, I don’t know if this is different with annots in JEE5.

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