By Deepak Alur, John Crupi, Dan Malks
This advisor offers the simplest practices for improvement utilizing J2EE applied sciences and info 21 layout styles that produce purposes awesome for his or her functionality, scalability, and robustness. A multi- tier case learn illustrates each level of company improvement, and pattern code is supplied. universal error are pointed out, to allow them to be shunned. The authors are Java architects and engineers
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Extra info for Core J2EE Patterns
1. 1. J2EE architecture The J2EE architecture consists of the following tiers: • Client tier— The client tier interacts with the user and displays information from the system to the user. The J2EE platform supports different types of clients, including HTML clients, Java applets, and Java applications. • Web tier— The Web tier generates presentation logic and accepts user responses from the presentation clients, which are typically HTML clients, Java applets, and other Web clients. Based on the received client request, The presentation tier generates the appropriate response to a client request that it receives.
Session Management The term user session describes a conversation that spans multiple requests between a client and a server. We rely on the concept of user session in the discussion in the following sections. Session State on Client Saving session state on the client involves serializing and embedding the session state within the view markup HTML page that is returned to the client. There are benefits to persisting session state on the client: • It is relatively easy to implement. • It works well when saving minimal amounts of state.
J2EE Architecture The J2EE architecture is a multitiered architecture. 1. 1. J2EE architecture The J2EE architecture consists of the following tiers: • Client tier— The client tier interacts with the user and displays information from the system to the user. The J2EE platform supports different types of clients, including HTML clients, Java applets, and Java applications. • Web tier— The Web tier generates presentation logic and accepts user responses from the presentation clients, which are typically HTML clients, Java applets, and other Web clients.
Core J2EE Patterns by Deepak Alur, John Crupi, Dan Malks