JBOSS IDE tutorial

[we-energies2]

I am having problems with the tutorial. I am getting exceptions when I click on the compute button in ComputeServlet page. I am getting:

javax.servlet.ServletException: Lookup of java:/comp/env/ failed
tutorial.web.ComputeServlet.init(ComputeServlet.java:64)
org.jboss.web.tomcat.security.CustomPrincipalValve.invoke(CustomPrincipalValve.java:39)
org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:153)
org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:59)
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:856)
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:744)
org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
org.apache.tomcat.util.net.MasterSlaveWorkerThread.run(MasterSlaveWorkerThread.java:112)
java.lang.Thread.run(Unknown Source)



I have followed the tutorial very close and this is the only issue I am having. Even looking at the code and script it seems correct. Has anyone had this same problem? Are there any solution?

Thanks

[nskarthik_k]

Same Dittoo with my Eclipse 3.02 + jdk1.4.2 + jboss4.2 + Eclipse plugin for
Jboss


Can some body help us out of this Problem

[darranl]

Could you post your generated web.xml deployment descriptor and your ComputeServlet.java code.

For both of these wrap them with [ code ] [ / code ] tags without the spaces and use the preview button to make sure that they display correctly.

[nskarthik_k]

Yes Shure

Web.xml
-----------------------------------------------------------------

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN" "http://java.sun.com/dtd/web-app_2_3.dtd">
<web-app >
<distributable/>
<servlet>
<servlet-name>Compute</servlet-name>
<display-name>Computation Servlet</display-name>
<description>[CDATA[Servlet that compute Fibonacci suite]]</description>
<servlet-class>tutorial.web.ComputeServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>Compute</servlet-name>
<url-pattern>/Compute</url-pattern>
</servlet-mapping>
<ejb-ref >
<description>[CDATA[Reference to the Fibo EJB]]</description>
<ejb-ref-name>ejb/Fibo</ejb-ref-name>
<ejb-ref-type>Session</ejb-ref-type>
<home>tutorial.interfaces.FiboHome</home>
<remote>tutorial.interfaces.Fibo</remote>
</ejb-ref>
</web-app>

-----------------------------------------------------------------

jboss-web.xml
-----------------------------------------------------------------

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE jboss-web PUBLIC "-//JBoss//DTD Web Application 2.3//EN" "http://www.jboss.org/j2ee/dtd/jboss-web_3_2.dtd">
<jboss-web>
<ejb-ref>
<ejb-ref-name>ejb/Fibo</ejb-ref-name>
<jndi-name>ejb/Fibo</jndi-name>
</ejb-ref>
</jboss-web>

-----------------------------------------------------------------

ComputeServlet.java
-----------------------------------------------------------------

package tutorial.web;

import java.io.IOException;
import java.io.PrintWriter;
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.rmi.PortableRemoteObject;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import tutorial.interfaces.Fibo;
import tutorial.interfaces.FiboHome;

public class ComputeServlet extends HttpServlet {
private FiboHome home;
public ComputeServlet() {
super();
}
public void init(ServletConfig config) throws ServletException {
try {
Context context = new InitialContext();
//Object ref = context.lookup("java:/comp/env/ejb/Fibo");
Object ref = context.lookup("ejb/Fibo");

home = (FiboHome) PortableRemoteObject.narrow(ref, FiboHome.class);
} catch (Exception e) {
throw new ServletException("Lookup of java:/comp/env/ failed");
}
}
protected void doPost(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
response.setContentType("text/html");
PrintWriter out = response.getWriter();
out.println("<html><head><title>");
out.println("Fibonaci Computation");
out.println("</title></head>");
out.println("<body>");
out.println("<h1>");
out.println("Fibonaci Computation");
out.println("</h1>");
try {
Fibo bean = home.create();
int limit = 0;
String value = request.getParameter("limit");
if (value != null) {
try {
limit = Integer.parseInt(value);
} catch (Exception e) {
}
}
double[] result = bean.compute(limit);
bean.remove();
out.println("<p>");
out.print("The ");
out.print(limit);
out.print(" first Fibonacci numbers ");
for (int i = 0; i < result.length; i++) {
out.println("<br>");
out.println(i);
out.println(" : ");
out.println(result);
 }
 out.println("</p>");
 } catch (Exception e) {
 out.println(e.getMessage());
 e.printStackTrace(out);
 } finally {
 out.println("</body></html>");
 out.close();
 }
 }
 }

-----------------------------------------------------------------

I hope this is what ever u had asked for...


thx in advance karthik

[darranl]

Inside your servlet code you have commented out the lookup line and replaced it with one that just looks up "ejb/Fibo" - you should change that back to lookup "java:/comp/env/ejb/Fibo".

Also where you catch the exception after the lookup you are hiding the cause of the error, you should add the caught exception as a second parameter to the new exception you are throwing: -

throw new ServletException("A message",e);

Can you try this out.

I suspect that the exception that is being hidden may be a ClassCastException. A change has been made to JBoss 4.0.2 that means you should no longer package the -client.jar file in the war as you will get ClassCastExceptions.

[nskarthik_k]

Hi

I am a new Bee in this env....

>> I suspect that the exception that is being hidden may >> be a ClassCastException. A change has been made >> JBoss 4.0.2 that means you should no longer
>> package the -client.jar file in the war as you will get >> ClassCastExceptions.


What exactly do u mean by this and What steps of Tutorial should I skipp to achieve the Desired Results for sucessfull deployment.

Thx in advance

[darranl]

Replace the line: -

throw new ServletException("Lookup of java:/comp/env/ failed");

with: -

throw new ServletException("Lookup of java:/comp/env/ failed",e);

Skip the FiboEJB-client.jar creation, and when creating the war skip the steps where the -client.jar is added to the war.

[jwpeng]

I followed closely to the tutorial and had similar problem. Only the error message is different.

javax.servlet.ServletException: Lookup of java:/comp/env/ failed javax.naming.NamingException: Could not dereference object [Root exception is javax.naming.NameNotFoundException: ejb not bound]

It seems the either ejb not started or jndi did not pickup the ejb. What can go wrong?

Thanks.

[nskarthik_k]

Hi

The Form started with the same Error u mentioned ,Me tried some hacking around...

I think Follow the steps said by darrnl....



Happy JBossing around......;)

[bjw]

To fix the tutorial just skip pg 36 which adds the FiboEJB-client.jar to FiboWeb.war. After that it works fine in Jboss AS 4.0.2 .

[jimstone]

The url is really java:comp/env/ejb/ Notice that the slash is missing prior to comp.

[steverar]

I was having similar problems. I went over the tutorial in detail and found out the jboss-web.xml wasn't being "packaged" in the war.
The tutorial runs fine, as is. I haven't removed the -client.jar file from packaging as suggested.

[darranl]

Steve, which JBoss version are you currently using the tutorial against?

[lusabo]

I try skip to add the client, and i got this error:

type Exception report

message

description The server encountered an internal error () that prevented it from fulfilling this request.

exception

javax.servlet.ServletException: Lookup of java:/comp/env/ failed
tutorial.web.ComputeServlet.init(ComputeServlet.java:46)
org.jboss.web.tomcat.security.CustomPrincipalValve.invoke(CustomPrincipalValve.java:39)
org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:153)
org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:59)
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:856)
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:744)
org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
org.apache.tomcat.util.net.MasterSlaveWorkerThread.run(MasterSlaveWorkerThread.java:112)
java.lang.Thread.run(Thread.java:534)

root cause

javax.naming.NamingException: Could not dereference object [Root exception is javax.naming.NameNotFoundException: ejb not bound]
org.jnp.interfaces.NamingContext.resolveLink(NamingContext.java:1052)
org.jnp.interfaces.NamingContext.lookup(NamingContext.java:685)
org.jnp.interfaces.NamingContext.lookup(NamingContext.java:701)
org.jnp.interfaces.NamingContext.lookup(NamingContext.java:572)
javax.naming.InitialContext.lookup(InitialContext.java:347)
tutorial.web.ComputeServlet.init(ComputeServlet.java:43)
org.jboss.web.tomcat.security.CustomPrincipalValve.invoke(CustomPrincipalValve.java:39)
org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:153)
org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:59)
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:856)
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:744)
org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
org.apache.tomcat.util.net.MasterSlaveWorkerThread.run(MasterSlaveWorkerThread.java:112)
java.lang.Thread.run(Thread.java:534)

root cause

javax.naming.NameNotFoundException: ejb not bound
org.jnp.server.NamingServer.getBinding(NamingServer.java:491)
org.jnp.server.NamingServer.getBinding(NamingServer.java:499)
org.jnp.server.NamingServer.getObject(NamingServer.java:505)
org.jnp.server.NamingServer.lookup(NamingServer.java:249)
org.jnp.interfaces.NamingContext.lookup(NamingContext.java:610)
org.jnp.interfaces.NamingContext.lookup(NamingContext.java:572)
javax.naming.InitialContext.lookup(InitialContext.java:347)
org.jnp.interfaces.NamingContext.resolveLink(NamingContext.java:1046)
org.jnp.interfaces.NamingContext.lookup(NamingContext.java:685)
org.jnp.interfaces.NamingContext.lookup(NamingContext.java:701)
org.jnp.interfaces.NamingContext.lookup(NamingContext.java:572)
javax.naming.InitialContext.lookup(InitialContext.java:347)
tutorial.web.ComputeServlet.init(ComputeServlet.java:43)
org.jboss.web.tomcat.security.CustomPrincipalValve.invoke(CustomPrincipalValve.java:39)
org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:153)
org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:59)
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:856)
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:744)
org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
org.apache.tomcat.util.net.MasterSlaveWorkerThread.run(MasterSlaveWorkerThread.java:112)
java.lang.Thread.run(Thread.java:534)

[jblackcoffee]

reply-to-steverar

I was having similar problems. I went over the tutorial in detail and found out the jboss-web.xml wasn't being "packaged" in the war.
The tutorial runs fine, as is. I haven't removed the -client.jar file from packaging as suggested.

The tutorial is ok - i suppose you just missed the jboss-web.xml during 'Packaging Configuration'.

Removing the -client.jar helped for me too !

Using : JBoss IDE Bundle 1.5 M3