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J2EE Review

J2EE, Java 2 Platform, Enterprise Edition, whose specifications are established by SUN, IBM and so on companies, and applied in the development based on enterprise environments. Some important technologies are defined in the J2EE specifications, for example: EJB,JMS,JSP,Serverlet and so on, in fact, these specifications just provide some description of implementation and some interfaces, now, what are we doing is how to realize them in java. In order to keep parts independent,J2EE has advised that the client application should be separated into three tiers: representation, logic and database; programmers' work is doing some things in these tiers, communication is between these tires. A component technology is expected for these tires, whose appearance changes the development pattern,J2EE programmers prepare some java components and deploy them on J2EE server.

System Architecture

 

 

 Biscuit Chart

 

  • System Folders

   This below picture show you the folder structure of our server, which is very easy to be catched.

  

   Folder's Description

   Folder      Description
          bin  console commands are stored here
         config  system configuration files
         deploy  application position
         lib  library files

 

Server Launch

When launching J2EE server, functions should be loaded into JVM memory and make them ready to be visited. The launch of them must obey a fixed order, because exists dependency between them. We will give out some activity diagrams to show this point.

 

 

 

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