Hashtable<String, String> env = new Hashtable<String, String>();
        env.put(Context.URL_PKG_PREFIXES, "org.jboss.ejb.client.naming");
        env.put("java.naming.factory.initial", "org.jboss.naming.remote.client.InitialContextFactory");
        env.put("java.naming.provider.url", String.format("%s://%s:%d", protocol, host,  port));
        env.put("jboss.naming.client.ejb.context", "true"); // this needs to be set for RemoteNaming InitialContext to be able to invoke an ejb
        env.put(Context.SECURITY_PRINCIPAL, username);
        env.put(Context.SECURITY_CREDENTIALS, password);

        InitialContext ctx = new InitialContext(env);
          Hello ejb = (Hello) ctx.lookup("/ejb-client/Hello!com.jboss.examples.ejb.Hello");
          System.out.println(ejb.sayHello());
          ctx.close();

java.lang.IllegalStateException: EJBCLIENT000025: No EJB receiver available for handling [appName:, moduleName:ejb-client, distinctName:] combination for invocation context org.jboss.ejb.client.EJBClientInvocationContext@2aa5fe93
	at org.jboss.ejb.client.EJBClientContext.requireEJBReceiver(EJBClientContext.java:825)
	at org.jboss.ejb.client.ReceiverInterceptor.handleInvocation(ReceiverInterceptor.java:128)
	at org.jboss.ejb.client.EJBClientInvocationContext.sendRequest(EJBClientInvocationContext.java:186)
	at org.jboss.ejb.client.EJBInvocationHandler.sendRequestWithPossibleRetries(EJBInvocationHandler.java:257)
	at org.jboss.ejb.client.EJBInvocationHandler.doInvoke(EJBInvocationHandler.java:202)
	at org.jboss.ejb.client.EJBInvocationHandler.doInvoke(EJBInvocationHandler.java:185)
	at org.jboss.ejb.client.EJBInvocationHandler.invoke(EJBInvocationHandler.java:148)
	at com.sun.proxy.$Proxy2.sayHello(Unknown Source)
	at com.jboss.examples.ejb.HelloClient.testRemoteProtocol(HelloClient.java:155)
	at com.jboss.examples.ejb.HelloClient.main(HelloClient.java:48)