J2EE Servers

1
J2EE Servers

• The administrator starts two J2EE servers.
• On the local server, the administrator creates a
  connection factory to communicate with the remote
  server.
• The application client uses two connection
  factories--a preconfigured one and the one just
  created--to create two connections, sessions,
  publishers, and subscribers. Each publisher
  publishes five messages.
• The local and the remote message-driven beans
  each receive five messages and send replies.
• The client's message listener consumes the
  replies.

2
Overall Structure
3
ReplyMsgBean.java

• Casts the incoming message to a TextMessage and
  displays the text
• Creates a connection, session, and publisher for
  the reply message
• Publishes the message to the reply topic
• Closes the connection

4
MultiAppServerRequester.java

• It uses the JavaTM Naming and Directory
  InterfaceTM (JNDI) API naming context
  javacomp/env to look up two connection factories
  and a topic.
• For each connection factory, it creates a
  connection, a publisher session, a publisher, a
  subscriber session, a subscriber, and a temporary
  topic for replies.
• Each subscriber sets its message listener,
  ReplyListener, and starts the connection.
• Each publisher publishes five messages and
  creates a list of the messages the listener
  should expect.
• When each reply arrives, the message listener
  displays its contents and removes it from the
  list of expected messages.
• When all the messages have arrived, the client
  exits.