Remote client access

[Vishal Dhingreja]

Hi All

Newbie to the world of EJB & will shortly start working on EJB's. I am preparing for SCBC also.

I saw a lot of examples but in none could I find how will the remote client specify the IP address of the server to retrieve the Remote Home Interface of the EJB

***********************************************************
Context ctx= new InitialContext();
Object ejbHome=initialContext.lookup("java:comp/env/ejb/account");
AccountHome accountHome = (AccountHome)javax.rmi.PortableRemoteObject.narrow(ejbHome,AccountHome.class);

*************************************************************

In this piece of code how will the client know which machine to look into for the remote home interface.

Rgrds
Vishal

[Yi Zou]

The way client find out IP stuff is through JNDI properties file. There you can specify the host name and port number of the JNDI services. After that, you always use JNDI to get remote stub.

[Vishal Dhingreja]

Hi Yi Zou

Thanks for your response. Since i am new to EJB I am not able to comprehend how the remote access will be.
Could it be possible for you to post the excerpts of the code or can you list some pointers where I can view the sample code for the same

Rgrds
Vishal

[Yi Zou]

I think the latest Enterprise Javabean from Oreilly has a workbook. If you look at their examples, every client has a jndi properties. Or you can download JBoss, they have a document called Getting Started with JBoss, you can get information how to setup your J2EE application in JBoss

[Adrian Fuckabee]

Hashtable env = new Hashtable();
env.put(Context.INITIAL_CONTEXT_FACTORY,
"com.ibm.Websphere.naming.WsnInitialContextFactory"); //Initial Context Factory class
env.put(Context.PROVIDER_URL, "corbaloc:iiop:myhost.mycompany.com:2809"); //URL of jndi server
InitialContext ctx = new InitialContext(env);
DataSource ds = (DataSource) ctx.lookup("java:comp/env/myDsAliasName");

See -
http://publib.boulder.ibm.com/infocenter/ws51help/index.jsp?topic=/com.ibm.websphere.base.doc/info/aes/ae/rnam_example_prop2.html

[Mishra Anshu]

See the code below :--

 
    private Context getInitialContext() throws Exception
    {
        String url = "t3://yourIpAddress:7001";
        String user = null;
        String password = null;
        Properties properties = null;
        try
        {
            properties = new Properties();
            properties.put(Context.INITIAL_CONTEXT_FACTORY, "weblogic.jndi.WLInitialContextFactory");
            properties.put(Context.PROVIDER_URL, url);
            if (user != null)
            {
                properties.put(Context.SECURITY_PRINCIPAL, user);
                properties.put(Context.SECURITY_CREDENTIALS, password == null ? "" : password);
            }
 
            return new InitialContext(properties);
        }
        catch(Exception e)
        {
            log("Unable to connect to WebLogic server at " + url);
            log("Please make sure that the server is running.");
            throw e;
        }
    }
 
        try
        {
            //get naming context
            Context context = getInitialContext();
 
            //look up jndi name
            Object ref = context.lookup("ActivationDataRemote");
            //look up jndi name and cast to Home interface
            activationDataRemoteHome = (ActivationDataRemoteHome) PortableRemoteObject.narrow(ref, ActivationDataRemoteHome.class);
            
        }
        catch(Exception e)
        {
            e.printStackTrace();
        }
    }