如何对客户端应用程序和Web应用程序都使用单个EJB

Question

I am very new to this EJB concept. I am assigned a task to develop an application which is a replica of netflix. We have two modules:

• Owner will have a desktop application
• users will have web application.

How do I line both desktop application and web based application for single EJB?

Answer 1

So you have an EJB deployed in an app server (eg Glassfish, JBoss, etc) and you want clients from a desktop (J2SE) and web (eg Tomcat) app to use this (remote, of course) EJB.

If that's what you have, you need your clients to connect to the remote EJB using JNDI, as follows (JBoss example):

try {
    Context context = new InitialContext(getJNDISetup());
    MyServiceEJBRemote delegate = (MyServiceEJBRemote)context.lookup(MY_SERVICEEJB_JNDI_NAME);               
} catch (NamingException e) {
    // log exception
}

private static Hashtable<?, ?> getJNDISetup() {
    // perform jndi lookup with your favorite method, hashtable, properties file... in this case, hashtable.
    Hashtable<String, String> setup = new Hashtable<String, String>();
    setup.put("java.naming.factory.initial","org.jnp.interfaces.NamingContextFactory");
    setup.put("java.naming.factory.url.pkgs","org.jboss.naming:org.jnp.interfaces");
    setup.put("java.naming.provider.url","localhost:1099");

    return setup;

}

Depending on your app server you might need to modify the key elements defined in the HashMap.

Your clients (destkop, web) will need to be aware of the EJB interface obviously. Both the web server and the desktop module will need also the app server naming libraries.