I can 't obtain the reference to an EJB!

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I can 't obtain the reference to an EJB!

I can 't obtain the reference to an EJB!

2006-02-16 - By Reydel

Back

Reply: 1 2 3

Hi, I?m a new one working with J2EE. I?m developing an application and I
need to access the EJBs from my client (a Java application).

This is the code of my client (a test one):

package clients;

import java.util.Properties;
import javax.rmi.PortableRemoteObject;
import javax.naming.*;

class Client
{
public static void main(String[] args)
{
Properties env = new Properties();

// Define properties and JNDI names lookup location.
env.setProperty("java.naming.factory.initial",
?org.jnp.interfaces.NamingContextFactory");
env.setProperty("java.naming.provider.url", "localhost:1099");
env.setProperty("java.naming.factory.url.pkgs", "org.jboss.naming");

try
{
// Bring the name context
InitialContext jndiContext = new InitialContext(env);
System.out.println("Contexto Disponible");

// Bring the referente to the EJB
Object ref = jndiContext.lookup("Calculo");
System.out.println("Se encontr? Referencia del EJB!");

// Bring the referente to the "Home Interface "
InteresesHome home = (InteresesHome)
PortableRemoteObject.narrow (ref, InteresesHome.class);

// Create an object from the "Home Interface"
Intereses interes = home.create();

// Call the function
System.out.println("Inter?s de 10,000 Capital, a tasa 10%, bajo 2
plazos anuales:");
System.out.println(interes.calcularInteres(10000, 0.10, 2));
}
catch(Exception e)
{
System.out.println(e.toString());
}
}
}

When I execute this, there is an error. It says:
javax.naming.NoInitialContextException: Cannot instantiate class:
org.jnp.interfaces.NamingContextFactory [Root exception is
java.lang.ClassNotFoundException: org.jnp.interfaces.NamingContextFactory]

Would some of you be so kind to help me fixing that? What sould I do?

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<div class=Section1>

?? Hi, I’m a new one working with J2EE. I&#8217
;m
developing an application and I need to access the EJBs from my client (a Java
application).<o:p></o:p>

?? This is the code of my
client (a test one):<o:p></o:p>

<o:p> </o:p>

<pre style='text-align:justify'>package clients;<o:p></o:p></pre><pre
style='text-align:justify'><o:p> </o:p><
/pre><pre
style='text-align:justify'>import java.util.Properties;<o:p
></o:p></pre><pre
style='text-align:justify'>import javax.rmi
.PortableRemoteObject; <o:p></o:p></pre><pre
style='text-align:justify'>import javax.naming.*;<o:p></o:p
></pre><pre
style='text-align:justify'><o:p> </o:p><
/pre><pre
style='text-align:justify'>class Client<o:p></o:p></pre><pre
style='text-align:justify'> {<o:p></o:p></pre
><pre
style='text-align:justify'>??? public static void main
(String[] args)<o:p></o:p></pre><pre
style='text-align:justify'>??? {<o:p></o:p><
/pre><pre
style='text-align:justify'>?????? Properties env = new Properties();<o
:p></o:p></pre><pre
style='text-align:justify'>?? ????<o:p></o:p></pre><pre
style='text-align:justify'>???????// Define properties and JNDI
names lookup location.<o:p></o:p></pre><pre
style='text-align:justify'>?????? env.setProperty("java.naming.factory.initial&quot
;, “org.jnp.interfaces.NamingContextFactory");<o:p></o:p></pre><pre
style='text-align:justify'>?????? env.setProperty(&quot
;java.naming.provider.url",? "localhost:1099");<o:p></o:p>
</pre><pre
style='text-align:justify'>????? ?env.setProperty(&quot
;java.naming.factory.url.pkgs",? "org.jboss.naming");<o:p></o:p></pre><pre
style='text-align:justify'><o:p> </o:p><
/pre><pre
style='text-align:justify'>?????? try<o:p></o:p></pre><pre
style='text-align:justify'>?????? {
<o:p></o:p></pre><pre style='text-align
:justify'>????????? // Bring the name context<o:p></o:p></pre><pre
style='text-align:justify'>????????? 
InitialContext jndiContext = new InitialContext
(env);<o:p></o:p></pre><pre
style='text-align:justify'>????????? System.out
.println("Contexto Disponible");<o:p></o:p></pre><pre>
???? ?????<o:p></o:p></pre><pre>??????????// Bring the referente to the EJB<o:p></o:p><
/pre><pre>????????? Object ref? = jndiContext.lookup("Calculo
");<o:p></o:p></pre><pre>
????????? System.out.println("Se encontr? Referencia del EJB!");<o:p><
/o:p></pre><pre>
????????? <o:p></o:p></pre><pre>??????????// Bring the referente to the "Home Interface "<o
:p></o:p></pre><pre>????????? InteresesHome home = (InteresesHome) <o:p></o:p></pre><pre>??????????PortableRemoteObject.narrow (ref, InteresesHome.class);<o
:p></o:p></pre><pre><o:p> </o:p></pre><pre>??????
??? // Create an object from the "Home Interface"<o:p></o:p></pre><pre>????????? Intereses interes = home.create();<o:p></o:p></pre><pre>
<o:p> </o:p></pre><pre>
????????? // Call the function <o:p></o:p></pre><pre>
??????????System.out.println("Inter?s de 10,000 Capital, a tasa 10%, bajo 2
plazos anuales:");<o:p></o:p></pre><pre>
????????? System.out.println(interes
.calcularInteres(10000, 0.10, 2));<o:p></o:p></pre><pre>?????? }<o:p></o:p></pre><pre>?????? catch(Exception e)<o:p></o:p></pre><pre>?????? {<o:p></o:p></pre><pre>????????? System.out.println(e.toString());<o:p></o:p></pre><pre>?????? }<o:p></o:p></pre><pre>??? }<o
:p></o:p></pre><pre>
}<o:p></o:p></pre><pre>
<o:p> </o:p></pre><pre>
<o:p> </o:p></pre>

When I execute this, there is an error. It says
:? ?javax.naming
.NoInitialContextException: Cannot instantiate
class: org.jnp.interfaces.NamingContextFactory [Root exception is java.lang
.ClassNotFoundException:
org.jnp.interfaces.NamingContextFactory]<o:p></o:p>

<pre><o:p> </o:p></pre><pre>
Would some of you be so kind to help me fixing
that? What sould I do?<o:p></o:p></pre>

<o:p> </o:p>

<o:p> </o:p>

<o:p> </o:p>

</div>

</body>

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