Calling EJB3.0 from another EJB3.0

[Dhiren Lodhia]

Hi all,
We all know that in EJB3.0 we can use @EJB annotaton to lookup the EJB either from Web Tier or application client or from another EJB also.all of these is working fine.

but EJB3.0 says that while calling EJB from another EJB it could also be done like following from one EJB3.0 :

@Resource private javax.ejb.SessionContext context;
public void myMethod() {
BankMgr bankMgr = (BankMgr)context.lookup(“ejb/BankMgr”);
}

Using SessionContext.
but when i try doing it i get an error saying NameNotFound for the 2nd EJB from 1st EJB??
no idea why???

apart from that how many names a EJB can have & if it has many then by what name should we look up??
for e.g
1)what is the name of EJB if we dnt give any name at all (nither JNDI nor mappedName)
2)what is mappedName (used with @Stateful & @Stateless)(after giving it can we lookup using old name)
3)what are implications of giving mappedName?
4)what is JNDI name for EJB?
5)how & where to give JNDI name to an EJB?(after giving it can we lookup using old name)
6)what is reference name for an EJB?(used in web tier in web.xml in <ejb-ref> element?
:roll: ops: :twisted:
Please help..............
I m using NetBeans6.5.10 & Glassfish V2

Thanks in advance.....................

[Jerwin Louise Uy]

Hi,

I will try to answer your questions the best as I can.

1. The default name of a session bean is the fully qualified class that it implements, i.e. SessionBean implements Foo.SomeRemoteInterface then that name attribute of SessionBean is bound to Foo.SomeRemoteInterface
2. mappedName bounds that session bean to a global variable in the RMI registry, but not all application server vendors are required to support this functionality
3. See #2 Assigning a mappedName may break portability across different application server vendors
4. See #1 - You can perform that following (assuming no ejb-jar.xml is used and default annotation values), then you can do the following

   
Context ctx = new InitialContext(); // this will assume that the ORB is located in localhost, default port, default provider
Foo.SomeRemoteInterface sri = (SomeRemoteInterface) ctx.lookup(Foo.SomeRemoteInterface.class.getName());

5. ejb-ref is that bound name for the session bean

For the purpose of SessionContext, you do not need to access this directly. If you really want to, the you can to modify the ejb-jar.xml to include the following information -

    

<session>
            <ejb-name>CustomerFacadeBean</ejb-name>
            <remote>com.iydris.sample.facade.CustomerFacadeBeanRemote</remote>
            <ejb-class>com.iydris.sample.facade.CustomerFacadeBean</ejb-class>
            <session-type>Stateless</session-type>
            <ejb-ref>
                <ejb-ref-name>CustomerFacade</ejb-ref-name>
                <ejb-ref-type>Session</ejb-ref-type>
                <remote>com.iydris.sample.session.beans.CustomerFacadeRemote</remote>
            </ejb-ref>
        </session>

@Stateless
public class CustomerFacadeBean implements CustomerFacadeBeanRemote {

    @Resource
    private SessionContext context;

    public Customer find(Object id) {
        CustomerFacadeRemote customerFacadeRemote = (CustomerFacadeRemote) context.lookup("CustomerFacade");
        return customerFacadeRemote.find(id);
    }
}

This deployment descriptor simply injects a session bean that implements the remote interface, bind to the the value of ejb-ref-name. Therefore, you can do the lookup on the SessionContext. I should note that the SessionContext is not aware of any global variables except for the ones declared in the ejb-jar.xml

I hope this information helps.

[Reza Rahman]

Dhiren,

You may also declare a component dependency using @Resource on the class. Kindly check with a good EJB 3.0 resource for futher details. The GlassFish docs, for example, are pretty decent.

Best regards,
Reza

[Dhiren Lodhia]

Jerwin Louise Uy wrote:Hi,

I will try to answer your questions the best as I can.

1. The default name of a session bean is the fully qualified class that it implements, i.e. SessionBean implements Foo.SomeRemoteInterface then that name attribute of SessionBean is bound to Foo.SomeRemoteInterface
2. mappedName bounds that session bean to a global variable in the RMI registry, but not all application server vendors are required to support this functionality
3. See #2 Assigning a mappedName may break portability across different application server vendors
4. See #1 - You can perform that following (assuming no ejb-jar.xml is used and default annotation values), then you can do the following

   
Context ctx = new InitialContext(); // this will assume that the ORB is located in localhost, default port, default provider
Foo.SomeRemoteInterface sri = (SomeRemoteInterface) ctx.lookup(Foo.SomeRemoteInterface.class.getName());

5. ejb-ref is that bound name for the session bean

For the purpose of SessionContext, you do not need to access this directly. If you really want to, the you can to modify the ejb-jar.xml to include the following information -

    

<session>
            <ejb-name>CustomerFacadeBean</ejb-name>
            <remote>com.iydris.sample.facade.CustomerFacadeBeanRemote</remote>
            <ejb-class>com.iydris.sample.facade.CustomerFacadeBean</ejb-class>
            <session-type>Stateless</session-type>
            <ejb-ref>
                <ejb-ref-name>CustomerFacade</ejb-ref-name>
                <ejb-ref-type>Session</ejb-ref-type>
                <remote>com.iydris.sample.session.beans.CustomerFacadeRemote</remote>
            </ejb-ref>
        </session>

@Stateless
public class CustomerFacadeBean implements CustomerFacadeBeanRemote {

    @Resource
    private SessionContext context;

    public Customer find(Object id) {
        CustomerFacadeRemote customerFacadeRemote = (CustomerFacadeRemote) context.lookup("CustomerFacade");
        return customerFacadeRemote.find(id);
    }
}

This deployment descriptor simply injects a session bean that implements the remote interface, bind to the the value of ejb-ref-name. Therefore, you can do the lookup on the SessionContext. I should note that the SessionContext is not aware of any global variables except for the ones declared in the ejb-jar.xml

I hope this information helps.

Thanks alot Jerwin
i did get some of doubts cleared specially about mappedName,i had thought it will be good to for ejb to give mappedName and will make ejb universally accessible from any where,didn't know that it is not in J2EE SPEC .
but i had a reason to believe that let me tell you one scenario ,
one i was trying to look up an EJB from remote standalone java POJO client and i kept getting the error of name not found till i gave the EJB mappedName.then it worked fine.

btw regarding SessionContext look up of EJB from EJB ,
i know that we don't need to do that we have many other ways but till i need to do it because its mentioned in Sun's EJB course FJ310 and hence i m required to show it practically to students.
i did read your post carefully and tried all you said but still it didn't work
i m posting here the code of mini project that i have made
please have a look at the code and let me know if any mistake is there ..........

i have made this Enterprise Application in NetBeans 6.1 and Glassfish AS
code of calling Second EJB from First using SessionContext is as follows :

 
package com.ejb;

import javax.ejb.Local;

/**
 *
 * @author Dhiren_Admin
 */
@Local
public interface FirstLocal {

    String firstEJBMethod();
    
}

package com.ejb;

import javax.annotation.Resource;
import javax.ejb.SessionContext;
import javax.ejb.Stateless;

/**
 *
 * @author Dhiren_Admin
 */
@Stateless
public class FirstBean implements FirstLocal {
    @Resource private SessionContext context;

    public String firstEJBMethod() {
        System.out.println("Inside firstEJBMethod");
        System.out.println("Trying to lookup Second EJB using SessionContext.........");
		//folowing also i tried but didnt work
        //SecondRemote remote=(SecondRemote)context.lookup("SecondBean");

        SecondRemote remote=(SecondRemote)context.lookup(com.ejb.SecondRemote.class.getName());
				//above also i tried but didnt work
        return "This is OutPut form firstEJBMethod :-: "+remote.secondEJBMethod();
    }   
}


package com.ejb;

import javax.ejb.Remote;

/**
 *
 * @author Dhiren_Admin
 */
@Remote
public interface SecondRemote {

    String secondEJBMethod();
    
}

package com.ejb;

import javax.ejb.Local;

/**
 *
 * @author Dhiren_Admin
 */
@Local
public interface SecondLocal {

    String secondEJBMethod();
    
}
package com.ejb;

import javax.ejb.Stateless;

/**
 *
 * @author Dhiren_Admin
 */
@Stateless
public class SecondBean implements SecondRemote, SecondLocal {

    public String secondEJBMethod() {
        System.out.println("Inside secondEJBMethod");
        System.out.println("Sending Output back to First EJB");
        return "This is OutPut form secondEJBMethod";
    }
    
    // Add business logic below. (Right-click in editor and choose
    // "EJB Methods > Add Business Method" or "Web Service > Add Operation")
 
}
--foll is ejb-jar.xml file i made is as u had said...............

<?xml version="1.0" encoding="UTF-8"?>
<ejb-jar xmlns = "http://java.sun.com/xml/ns/javaee" 
         version = "3.0" 
         xmlns:xsi = "http://www.w3.org/2001/XMLSchema-instance" 
         xsi:schemaLocation = "http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/ejb-jar_3_0.xsd">
    <enterprise-beans>
        <session>
            <ejb-name>SecondBean</ejb-name>
            <remote>com.ejb.SecondRemote</remote>
            <ejb-class>com.ejb.SecondBean</ejb-class>
            <session-type>Stateless</session-type>
            <ejb-ref>
                <ejb-ref-name>SecondBean</ejb-ref-name>
                <ejb-ref-type>Session</ejb-ref-type>
                <remote>com.ejb.SecondRemote</remote>
            </ejb-ref>
        </session>
    </enterprise-beans>
</ejb-jar>

Serlvet Client from which i m calling the First EJB

package com.web.client;

import com.ejb.FirstLocal;
import java.io.*;
import java.net.*;

import javax.ejb.EJB;
import javax.servlet.*;
import javax.servlet.http.*;

/**
 *
 * @author Dhiren_Admin
 */
public class EJBClinetServlet extends HttpServlet {
    @EJB
    private FirstLocal firstBean;
   
    /** 
    * Processes requests for both HTTP <code>GET</code> and <code>POST</code> methods.
    * @param request servlet request
    * @param response servlet response
    */
    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        response.setContentType("text/html;charset=UTF-8");
        PrintWriter out = response.getWriter();
        try {
          
            out.println("<html>");
            out.println("<head>");
            out.println("<title>Servlet EJBClinetServlet</title>");  
            out.println("</head>");
            out.println("<body>");
            out.println("<h1>Output from Both EJBs :</h1><BR>");
            out.println("<h2>"+firstBean.firstEJBMethod()+"</h2>");
            out.println("</body>");
            out.println("</html>");
           
        } finally { 
            out.close();
        }
    } 

    // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
    /** 
    * Handles the HTTP <code>GET</code> method.
    * @param request servlet request
    * @param response servlet response
    */
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        processRequest(request, response);
    } 

    /** 
    * Handles the HTTP <code>POST</code> method.
    * @param request servlet request
    * @param response servlet response
    */
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        processRequest(request, response);
    }

    /** 
    * Returns a short description of the servlet.
    */
    public String getServletInfo() {
        return "Short description";
    }
    // </editor-fold>
}

Following is the Error message on GF server console (Stack Trace)
Following is the Stack trace  on glassfish console i get while running the Servlet

Inside firstEJBMethod
Trying to lookup Second EJB using SessionContext.........
EJB5018: An exception was thrown during an ejb invocation on [FirstBean]
javax.ejb.EJBException
        at com.sun.ejb.containers.BaseContainer.processSystemException(BaseContainer.java:3869)
        at com.sun.ejb.containers.BaseContainer.completeNewTx(BaseContainer.java:3769)
        at com.sun.ejb.containers.BaseContainer.postInvokeTx(BaseContainer.java:3571)
        at com.sun.ejb.containers.BaseContainer.postInvoke(BaseContainer.java:1354)
        at com.sun.ejb.containers.BaseContainer.postInvoke(BaseContainer.java:1316)
        at com.sun.ejb.containers.EJBLocalObjectInvocationHandler.invoke(EJBLocalObjectInvocationHandler.java:205)
        at com.sun.ejb.containers.EJBLocalObjectInvocationHandlerDelegate.invoke(EJBLocalObjectInvocationHandlerDelegate.java:127)
        at $Proxy49.firstEJBMethod(Unknown Source)
        at com.web.client.EJBClinetServlet.processRequest(EJBClinetServlet.java:41)
        at com.web.client.EJBClinetServlet.doGet(EJBClinetServlet.java:58)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:718)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:831)
        at org.apache.catalina.core.ApplicationFilterChain.servletService(ApplicationFilterChain.java:411)
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:290)
        at org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:271)
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:202)
        at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:632)
        at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:577)
        at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:94)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:206)
        at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:632)
        at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:577)
        at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:571)
        at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:1080)
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:150)
        at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:632)
        at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:577)
        at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:571)
        at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:1080)
        at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:272)
        at com.sun.enterprise.web.connector.grizzly.DefaultProcessorTask.invokeAdapter(DefaultProcessorTask.java:637)
        at com.sun.enterprise.web.connector.grizzly.DefaultProcessorTask.doProcess(DefaultProcessorTask.java:568)
        at com.sun.enterprise.web.connector.grizzly.DefaultProcessorTask.process(DefaultProcessorTask.java:813)
        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.IllegalArgumentException: javax.naming.NameNotFoundException: No object bound to name java:comp/env/com.ejb.SecondRemote
        at com.sun.ejb.containers.EJBContextImpl.lookup(EJBContextImpl.java:385)
        at com.ejb.FirstBean.firstEJBMethod(FirstBean.java:24)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at com.sun.enterprise.security.application.EJBSecurityManager.runMethod(EJBSecurityManager.java:1067)
        at com.sun.enterprise.security.SecurityUtil.invoke(SecurityUtil.java:176)
        at com.sun.ejb.containers.BaseContainer.invokeTargetBeanMethod(BaseContainer.java:2895)
        at com.sun.ejb.containers.BaseContainer.intercept(BaseContainer.java:3986)
        at com.sun.ejb.containers.EJBLocalObjectInvocationHandler.invoke(EJBLocalObjectInvocationHandler.java:197)
        ... 33 more
Caused by: javax.naming.NameNotFoundException: No object bound to name java:comp/env/com.ejb.SecondRemote
        at com.sun.enterprise.naming.NamingManagerImpl.lookup(NamingManagerImpl.java:834)
        at com.sun.enterprise.naming.java.javaURLContext.lookup(javaURLContext.java:173)
        at com.sun.enterprise.naming.SerialContext.lookup(SerialContext.java:396)
        at javax.naming.InitialContext.lookup(InitialContext.java:392)
        at com.sun.ejb.containers.EJBContextImpl.lookup(EJBContextImpl.java:383)
        ... 43 more
StandardWrapperValve[EJBClinetServlet]: PWC1406: Servlet.service() for servlet EJBClinetServlet threw exception
javax.ejb.EJBException
        at com.sun.ejb.containers.BaseContainer.processSystemException(BaseContainer.java:3869)
        at com.sun.ejb.containers.BaseContainer.completeNewTx(BaseContainer.java:3769)
        at com.sun.ejb.containers.BaseContainer.postInvokeTx(BaseContainer.java:3571)
        at com.sun.ejb.containers.BaseContainer.postInvoke(BaseContainer.java:1354)
        at com.sun.ejb.containers.BaseContainer.postInvoke(BaseContainer.java:1316)
        at com.sun.ejb.containers.EJBLocalObjectInvocationHandler.invoke(EJBLocalObjectInvocationHandler.java:205)
        at com.sun.ejb.containers.EJBLocalObjectInvocationHandlerDelegate.invoke(EJBLocalObjectInvocationHandlerDelegate.java:127)
        at $Proxy49.firstEJBMethod(Unknown Source)
        at com.web.client.EJBClinetServlet.processRequest(EJBClinetServlet.java:41)
        at com.web.client.EJBClinetServlet.doGet(EJBClinetServlet.java:58)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:718)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:831)
        at org.apache.catalina.core.ApplicationFilterChain.servletService(ApplicationFilterChain.java:411)
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:290)
        at org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:271)
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:202)
        at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:632)
        at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:577)
        at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:94)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:206)
        at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:632)
        at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:577)
        at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:571)
        at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:1080)
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:150)
        at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:632)
        at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:577)
        at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:571)
        at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:1080)
        at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:272)
        at com.sun.enterprise.web.connector.grizzly.DefaultProcessorTask.invokeAdapter(DefaultProcessorTask.java:637)
        at com.sun.enterprise.web.connector.grizzly.DefaultProcessorTask.doProcess(DefaultProcessorTask.java:568)
        at com.sun.enterprise.web.connector.grizzly.DefaultProcessorTask.process(DefaultProcessorTask.java:813)
        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.IllegalArgumentException: javax.naming.NameNotFoundException: No object bound to name java:comp/env/com.ejb.SecondRemote
        at com.sun.ejb.containers.EJBContextImpl.lookup(EJBContextImpl.java:385)
        at com.ejb.FirstBean.firstEJBMethod(FirstBean.java:24)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at com.sun.enterprise.security.application.EJBSecurityManager.runMethod(EJBSecurityManager.java:1067)
        at com.sun.enterprise.security.SecurityUtil.invoke(SecurityUtil.java:176)
        at com.sun.ejb.containers.BaseContainer.invokeTargetBeanMethod(BaseContainer.java:2895)
        at com.sun.ejb.containers.BaseContainer.intercept(BaseContainer.java:3986)
        at com.sun.ejb.containers.EJBLocalObjectInvocationHandler.invoke(EJBLocalObjectInvocationHandler.java:197)
        ... 33 more
Caused by: javax.naming.NameNotFoundException: No object bound to name java:comp/env/com.ejb.SecondRemote
        at com.sun.enterprise.naming.NamingManagerImpl.lookup(NamingManagerImpl.java:834)
        at com.sun.enterprise.naming.java.javaURLContext.lookup(javaURLContext.java:173)
        at com.sun.enterprise.naming.SerialContext.lookup(SerialContext.java:396)
        at javax.naming.InitialContext.lookup(InitialContext.java:392)
        at com.sun.ejb.containers.EJBContextImpl.lookup(EJBContextImpl.java:383)
        ... 43 more

please let me know if any thing more can be done..........

[Jerwin Louise Uy]

Hi Dhiren,

Yes. That will cause the error because the deployment descriptor is wrong.

Here is the modified ejb-jar.xml

    

<enterprise-beans>
        <session>
            <ejb-name>FirstBean</ejb-name> // this is the part where we are telling the EJB container to inject the resources to FirstBean
            <local>com.ejb.FirstLocal</local>
            <ejb-class>com.ejb.FirstBean</ejb-class>
            <session-type>Stateless</session-type>
            <ejb-ref>
                <ejb-ref-name>SecondBean</ejb-ref-name> // this is the parameter that locally visible to the context of the method invocation
                <ejb-ref-type>Session</ejb-ref-type>
                <remote>com.ejb.SecondRemote</remote>
            </ejb-ref>
        </session>
    </enterprise-beans>

Regards.

[Dhiren Lodhia]

Jerwin Louise Uy wrote:Hi Dhiren,

Yes. That will cause the error because the deployment descriptor is wrong.

Here is the modified ejb-jar.xml

    

<enterprise-beans>
        <session>
            <ejb-name>FirstBean</ejb-name> // this is the part where we are telling the EJB container to inject the resources to FirstBean
            <local>com.ejb.FirstLocal</local>
            <ejb-class>com.ejb.FirstBean</ejb-class>
            <session-type>Stateless</session-type>
            <ejb-ref>
                <ejb-ref-name>SecondBean</ejb-ref-name> // this is the parameter that locally visible to the context of the method invocation
                <ejb-ref-type>Session</ejb-ref-type>
                <remote>com.ejb.SecondRemote</remote>
            </ejb-ref>
        </session>
    </enterprise-beans>

Regards.

Thanks a ton Jerwin,
it finally worked for me.
have no words to thank you,
will keep in touch with you .......
Regards Dhiren