Weblogic & EJB

Question

Hi, everyone
I am a freshman .There is a problem to me .I need your help. thanks.
the detail as following:
InitialContext ctx=new InitialContext();
Object objRef = ctx.lookup("java:comp/env/Hello"); ---when i want to call ejb module and the application run to this line,it will throw a javax.naming.NamingException.
the detailed error info :
javax.naming.NoInitialContextException: Need to specify class name in environment or system property, or as an applet parameter, or in an application resource file: java.naming.factory.initial
     at javax.naming.spi.NamingManager.getInitialContext(NamingManager.java:640)
     at javax.naming.InitialContext.getDefaultInitCtx(InitialContext.java:243)
     at javax.naming.InitialContext.getURLOrDefaultInitCtx(InitialContext.java:280)
     at javax.naming.InitialContext.lookup(InitialContext.java:347)
     at Test.main(Test.java:9)
others：
1.Weblogic is as ejb container.
2.There is no warning and error when I start weblogic server ,so i can confirm that there is no problem in the ejb module. And there is no problem in the file of "ejb-jar.xml" either.
<2004-8-23 03:53:27 PM> <Notice> <Application Poller> <149400> <Activating
application: appsdirHello_jar>
<2004-8-23 03:53:27 PM> <Notice> <Application Poller> <149404> <Activate ap
plication appsdirHello_jar on rickyserver - Running>
<2004-8-23 03:53:29 PM> <Notice> <Application Poller> <149404> <Activate ap
plication appsdirHello_jar on rickyserver - Completed>
THE ejb-jar.xml:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE ejb-jar PUBLIC "-//Sun Microsystems, Inc.//DTD Enterprise JavaBeans 2.0//EN"
"http://java.sun.com/dtd/ejb-jar_2_0.dtd">
<ejb-jar>
     <description>
          This is Hello EJB example
     </description>
     <display-name>HelloBean</display-name>
     <enterprise-beans>
          <session>
               <display-name>Hello</display-name>
               <ejb-name>Hello</ejb-name>
               <home>HelloHome</home>
               <remote>Hello</remote>
               <ejb-class>HelloEJB</ejb-class>
               <session-type>Stateless</session-type>
               <transaction-type>Container</transaction-type>
          </session>
     </enterprise-beans>
</ejb-jar>
question&#65306;
where is error? plz tell me, thanks very much.

Answer 1

Check your weblogic-ejb-jar.xml file and add following...
I am assuming you are using weblogic 8.1, if not then refer respective .dtd and make change accordingly.
<weblogic-enterprise-bean>
<ejb-name>Hello</ejb-name>
<local-jndi-name>Hello</local-jndi-name>
</weblogic-enterprise-bean>
Following is the sample code for lookup...
Hashtable h = new Hashtable();
h.put(Context.INITIAL_CONTEXT_FACTORY, "weblogic.jndi.WLInitialContextFactory");
h.put(Context.PROVIDER_URL, "t3://localhost:7001");
h.put(Context.SECURITY_PRINCIPAL, "username");
h.put(Context.SECURITY_CREDENTIALS, "password");               
InitialContext initialContext = new InitialContext(h);
HelloLocalHome helloLocalHome = (HelloLocalHome)initialContext.lookup("Hello");
Note : You need to provide valid username and password of the weblogic.
h.put(Context.SECURITY_PRINCIPAL, "username");
h.put(Context.SECURITY_CREDENTIALS, "password");     
Here dummy values are written; replace these values by valid username and password.
+ Mihir