Problem accessing ejb from servlet

Hi,
I'm aving a problem accessing a stateful session bean from a servlet. I'm using a jndi lookup to do it because I need that a client has its own bean reference...
My code into the service method is:
InitialContext ctx;
try {
ctx = new InitialContext();
carrelloService = (CarrelloLocal)ctx.lookup("java:comp/env/ejb/Carrello");
and I have a reference to EJB into web.xml:
<ejb-local-ref>
<ejb-ref-name>ejb/Carrello</ejb-ref-name>
<ejb-ref-type>Session</ejb-ref-type>
<local-home></local-home>
<local>carrello.model.CarrelloLocal</local>
</ejb-local-ref>
If I use @EJB annotation to inject the servlet, it works fine.
Instead using jndi lookup throws a NamingException because it doesn't find java:comp/env/ejb/Carrello entry.
Any idea about the problem?

Here's something simple that I have that works:
 
SimpleBean
 
@Stateless(name="SimpleBean")
public class SimpleBeanBean implements SimpleBeanLocal {
 
web.xml; -- note I use a whacko ejb-ref-name just to make it obvious where I'm using it.
 
 <ejb-local-ref>
 <ejb-ref-name>ejb_mapping_doodad/SimpleBean</ejb-ref-name>
 <ejb-ref-type>Session</ejb-ref-type>
 <local>sab.otn681398.ejb.SimpleBeanLocal</local>
 </ejb-local-ref> 
servlet:
 
package sab.otn681398.web;
import java.io.IOException;
import java.io.PrintWriter;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import javax.servlet.*;
import javax.servlet.http.*;
import sab.otn681398.ejb.SimpleBeanLocal;
public class TestServlet extends HttpServlet {
 private static final String CONTENT_TYPE = "text/html; charset=windows-1252";
 private static final String SIMPLE_BEAN_JNDI = "ejb_mapping_doodad/ASimpleBean";
 private final boolean USEENC = true;
 private SimpleBeanLocal simple = null;
 public void init(ServletConfig config) throws ServletException {
 super.init(config);
 public void doGet(HttpServletRequest request,
 HttpServletResponse response) throws ServletException, IOException {
 response.setContentType(CONTENT_TYPE);
 PrintWriter out = response.getWriter();
 try {
 if(simple==null) {
 simple = createSimple();
 } catch(NamingException ne) {
 throw new ServletException("Error in looking up the EJB", ne);
 out.println("<html>");
 out.println("<head><title>TestServlet</title></head>");
 out.println("<body>");
 out.printf("The %s bean has been hit: %s times", simple, simple.getHitCount());
 out.println("</body></html>");
 out.close();
 private SimpleBeanLocal createSimple() throws NamingException {
 return (USEENC==true? createSimpleViaENC(): createSimpleViaName());
 private SimpleBeanLocal createSimpleViaENC() throws NamingException {
 InitialContext ic = new InitialContext();
 SimpleBeanLocal simple = (SimpleBeanLocal)ic.lookup("java:comp/env/" + SIMPLE_BEAN_JNDI);
 return simple;
 private SimpleBeanLocal createSimpleViaName() throws NamingException {
 InitialContext ic = new InitialContext();
 SimpleBeanLocal simple = (SimpleBeanLocal)ic.lookup(SIMPLE_BEAN_JNDI);
 return simple;
} 
-steve-

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Hi,
I have in service method my servlet code.
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Ravi --
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<remote>faqapp.ejb.AppSessionFacade</remote>
</ejb-ref>
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cheers
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Hi!
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[Fwd: Security problem accessing MBeanServer from a servlet]

Reposting to Security and Servlet newsgroups.
-------- Original Message --------
Subject: Security problem accessing MBeanServer from a servlet
Date: 10 Feb 2004 13:02:09 -0800
From: Alain <[email protected]>
Reply-To: Alain <[email protected]>
Organization: BEA NEWS SITE
Newsgroups: weblogic.developer.interest.management
Hi,
I am trying to understand how WLS 7.0 secures a call to an MBean. Got
the following
scenario:
- I am in a servlet context
- I have created and registered an MBean with the WLS MBeanServer. Fine
so far
- Within the same call I can retrieve the MBean attributes. Fine so far
- I keep the MBeanServer reference in an object global to the servlet
context
The problem:
- When I do another request and try to use the cached MBeanServer
instance to
access the MBean, I get the following error:
weblogic.management.NoAccessRuntimeException: Access not allowed for
subject:
principals=[], on ResourceType ...
Any idea?
Alain

PaulF <paulf@reply_in_newsgroup.com> wrote:
On 10 Feb 2004 13:02:09 -0800, Alain <[email protected]> wrote:
Hi,
I am trying to understand how WLS 7.0 secures a call to an MBean. Got
the following
scenario:
- I am in a servlet context
- I have created and registered an MBean with the WLS MBeanServer.Fine
so far
- Within the same call I can retrieve the MBean attributes. Fine sofar
- I keep the MBeanServer reference in an object global to the servlet
context
The problem:
- When I do another request and try to use the cached MBeanServer
instance to
access the MBean, I get the following error:
weblogic.management.NoAccessRuntimeException: Access not allowed for
subject:
principals=[], on ResourceType ...
Any idea?
AlainWhat ResourceType are you trying to access. From the Exception you're
trying to access it as an Anonymous user (principals=[]) and evidently
you're attempting to access something that is protected. I can't tell
what
from the snippet you've included.
Using M2, Opera's revolutionary e-mail client: http://www.opera.com/m2/
Thanks Paul for your reply.
You are right. I can access my custom MBeans if I am authenticated for example
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at org.apache.tomcat.core.ServletWrapper.service(Compiled Code)
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at org.apache.tomcat.service.TcpWorkerThread.runIt(Compiled Code)
at org.apache.tomcat.util.ThreadPool$ControlRunnable.run(Compiled Code)
at java.lang.Thread.run(Compiled Code)
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Thanks for your help.
null

Yes, I did. Actually, if I run my servlet in JDeveloper (Web-to-Go), it all works fine. I also extracted the code that calls the EJB from the servlet and I tested it in a small Java application, and it also works fine.
Things stop to work when I deploy my servlet in JRun or in Tomcat.
It appears that my code is correct, but the environment I try to run it is not, and I can't figure out what's wrong.
Can anyone help me?
<BLOCKQUOTE>quote:<HR>Originally posted by Sandeep Desai ([email protected]):
Have you provided the environmental settings in the servlet.
It should be :
import oracle.aurora.jndi.sess_iiop.ServiceCtx;
env.put(Context.URL_PKG_PREFIXES, "oracle.aurora.jndi");
env.put(Context.SECURITY_PRINCIPAL, username);
env.put(Context.SECURITY_CREDENTIALS, password);
env.put(Context.SECURITY_AUTHENTICATION, ServiceCtx.NON_SSL_LOGIN);
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HomeObject home = PortableRemoteObject.narrow(
obj,"HomeObject.class");
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<HR></BLOCKQUOTE>
null

Security problem accessing MBeanServer from a servlet

Hi,
I am trying to understand how WLS 7.0 secures a call to an MBean. Got the following
scenario:
- I am in a servlet context
- I have created and registered an MBean with the WLS MBeanServer. Fine so far
- Within the same call I can retrieve the MBean attributes. Fine so far
- I keep the MBeanServer reference in an object global to the servlet context
The problem:
- When I do another request and try to use the cached MBeanServer instance to
access the MBean, I get the following error:
weblogic.management.NoAccessRuntimeException: Access not allowed for subject:
principals=[], on ResourceType ...
Any idea?
Alain

PaulF <paulf@reply_in_newsgroup.com> wrote:
On 10 Feb 2004 13:02:09 -0800, Alain <[email protected]> wrote:
Hi,
I am trying to understand how WLS 7.0 secures a call to an MBean. Got
the following
scenario:
- I am in a servlet context
- I have created and registered an MBean with the WLS MBeanServer.Fine
so far
- Within the same call I can retrieve the MBean attributes. Fine sofar
- I keep the MBeanServer reference in an object global to the servlet
context
The problem:
- When I do another request and try to use the cached MBeanServer
instance to
access the MBean, I get the following error:
weblogic.management.NoAccessRuntimeException: Access not allowed for
subject:
principals=[], on ResourceType ...
Any idea?
AlainWhat ResourceType are you trying to access. From the Exception you're
trying to access it as an Anonymous user (principals=[]) and evidently
you're attempting to access something that is protected. I can't tell
what
from the snippet you've included.
Using M2, Opera's revolutionary e-mail client: http://www.opera.com/m2/
Thanks Paul for your reply.
You are right. I can access my custom MBeans if I am authenticated for example
as an Administrator. My problem is that I want any application to access this
MBean authenticated or not. I am trying to find how I could grant permission to
this MBean to everyone. Still searching.
Thanks.

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Exception Stack: -
========================================================
avax.naming.NameNotFoundException: Context: localhost/nodes/localhost/servers/server1, name: TestLocalHome: First component in name TestLocalHome not found. Root exception is org.omg.CosNaming.NamingContextPackage.NotFound: IDL:omg.org/CosNaming/NamingContext/NotFound:1.0
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[12/8/05 14:14:05:047 IST] 7debf35b SystemErr R      at com.ibm.ws.naming.jndicos.CNContextImpl.cosResolve(CNContextImpl.java:3491)
[12/8/05 14:14:05:047 IST] 7debf35b SystemErr R      at com.ibm.ws.naming.jndicos.CNContextImpl.doLookup(CNContextImpl.java:1519)
[12/8/05 14:14:05:047 IST] 7debf35b SystemErr R      at com.ibm.ws.naming.jndicos.CNContextImpl.doLookup(CNContextImpl.java:1480)
[12/8/05 14:14:05:047 IST] 7debf35b SystemErr R      at com.ibm.ws.naming.jndicos.CNContextImpl.lookupExt(CNContextImpl.java:1187)
[12/8/05 14:14:05:047 IST] 7debf35b SystemErr R      at com.ibm.ws.naming.jndicos.CNContextImpl.lookup(CNContextImpl.java:1067)
[12/8/05 14:14:05:047 IST] 7debf35b SystemErr R      at com.ibm.ws.naming.util.WsnInitCtx.lookup(WsnInitCtx.java:132)
[12/8/05 14:14:05:047 IST] 7debf35b SystemErr R      at javax.naming.InitialContext.lookup(InitialContext.java:360)
[12/8/05 14:14:05:047 IST] 7debf35b SystemErr R      at org.apache.jsp._DomainClient._jspService(_DomainClient.java:95)
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[12/8/05 14:14:05:047 IST] 7debf35b SystemErr R      at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
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[12/8/05 14:14:05:047 IST] 7debf35b SystemErr R      at com.ibm.ws.webcontainer.jsp.servlet.JspServlet.service(JspServlet.java:767)
[12/8/05 14:14:05:047 IST] 7debf35b SystemErr R      at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
[12/8/05 14:14:05:047 IST] 7debf35b SystemErr R      at com.ibm.ws.webcontainer.servlet.StrictServletInstance.doService(StrictServletInstance.java:110)
[12/8/05 14:14:05:047 IST] 7debf35b SystemErr R      at com.ibm.ws.webcontainer.servlet.StrictLifecycleServlet._service(StrictLifecycleServlet.java:174)
[12/8/05 14:14:05:047 IST] 7debf35b SystemErr R      at com.ibm.ws.webcontainer.servlet.IdleServletState.service(StrictLifecycleServlet.java:313)
[12/8/05 14:14:05:047 IST] 7debf35b SystemErr R      at com.ibm.ws.webcontainer.servlet.StrictLifecycleServlet.service(StrictLifecycleServlet.java:116)
[12/8/05 14:14:05:047 IST] 7debf35b SystemErr R      at com.ibm.ws.webcontainer.servlet.ServletInstance.service(ServletInstance.java:283)
[12/8/05 14:14:05:047 IST] 7debf35b SystemErr R      at com.ibm.ws.webcontainer.servlet.ValidServletReferenceState.dispatch(ValidServletReferenceState.java:42)
[12/8/05 14:14:05:047 IST] 7debf35b SystemErr R      at com.ibm.ws.webcontainer.servlet.ServletInstanceReference.dispatch(ServletInstanceReference.java:40)
[12/8/05 14:14:05:047 IST] 7debf35b SystemErr R      at com.ibm.ws.webcontainer.webapp.WebAppRequestDispatcher.handleWebAppDispatch(WebAppRequestDispatcher.java:983)
[12/8/05 14:14:05:047 IST] 7debf35b SystemErr R      at com.ibm.ws.webcontainer.webapp.WebAppRequestDispatcher.dispatch(WebAppRequestDispatcher.java:564)
[12/8/05 14:14:05:062 IST] 7debf35b SystemErr R      at com.ibm.ws.webcontainer.webapp.WebAppRequestDispatcher.forward(WebAppRequestDispatcher.java:200)
[12/8/05 14:14:05:062 IST] 7debf35b SystemErr R      at com.ibm.ws.webcontainer.srt.WebAppInvoker.doForward(WebAppInvoker.java:119)
[12/8/05 14:14:05:062 IST] 7debf35b SystemErr R      at com.ibm.ws.webcontainer.srt.WebAppInvoker.handleInvocationHook(WebAppInvoker.java:276)
[12/8/05 14:14:05:062 IST] 7debf35b SystemErr R      at com.ibm.ws.webcontainer.cache.invocation.CachedInvocation.handleInvocation(CachedInvocation.java:71)
[12/8/05 14:14:05:062 IST] 7debf35b SystemErr R      at com.ibm.ws.webcontainer.srp.ServletRequestProcessor.dispatchByURI(ServletRequestProcessor.java:182)
[12/8/05 14:14:05:062 IST] 7debf35b SystemErr R      at com.ibm.ws.webcontainer.oselistener.OSEListenerDispatcher.service(OSEListener.java:334)
[12/8/05 14:14:05:062 IST] 7debf35b SystemErr R      at com.ibm.ws.webcontainer.http.HttpConnection.handleRequest(HttpConnection.java:56)
[12/8/05 14:14:05:062 IST] 7debf35b SystemErr R      at com.ibm.ws.http.HttpConnection.readAndHandleRequest(HttpConnection.java:618)
[12/8/05 14:14:05:062 IST] 7debf35b SystemErr R      at com.ibm.ws.http.HttpConnection.run(HttpConnection.java:439)
[12/8/05 14:14:05:062 IST] 7debf35b SystemErr R      at com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java:672)
========================================================
Please help asap.
Regds
VJ.

The ejb spec only defines local ejb access within the same application. It's possible some app servers support access from a different application but it wouldn't be portable, nor would it work within the J2EE SDK or Sun Java System App Servers. To access a local ejb from a web component or ejb , define an ejb-local-ref in the client component's standard .xml file (web.xml or ejb-jar.xml) and use the ejb-link element to specify the ejb-name of the target ejb.
--ken

Loading remote EJB from servlet using jakarta and openejb

I am trying to create an environment where I use
openejb as my EJB container, and JAKARTA Tomcat
as my
Servlet/JSP container. However,
i'm having a problem in lookingup my remote EJB from my
jakarta application.
That exact code works perfectly if I run it standalone. I
am using the same JRE. Jakarta has also loaded the
openejb-0.8.3.jar and openejb_client-0.8.3.jar
What I dont understand is why jakarta
would behave differently than command-line java when I
am
running in the same JRE on a single machine.
Any help would be much appreciated.

Several fairly major improvements have been maid in OpenEJB specifically for the Tomcat people. For one, the whole way you integrate them has completely been rewritten. Now all you have to do is copy a openejb_loader-0.9.1.war into the Tomcat webapps directory and change an init-param in it. Pretty straight forward. OpenEJB 0.8.3 won't work with Tomcat in the same VM, however OpenEJB 0.9.0 and up have been totally revamped in all things related to classloading so that it can co-exist with Tomcats unique classloading architecture.
O'Reilly just published an article detailing the ins and outs of the integration, it's a pretty good read:
http://www.onjava.com/pub/a/onjava/2003/02/12/ejb_tomcat.html

Problem accessing ejb from servlet

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