By Robert Eckstein
Until eventually Java firm top Practices, complex Java builders depended on the recommendation of a loose-knit group of fellow builders, time-consuming on-line searches for examples or feedback for the instant challenge they confronted, and tedious trial-and-error. yet Java has grown to incorporate a major variety of APIs, sessions, and strategies. Now it's just too huge for even the main intrepid developer to grasp all of it. the necessity for a written compendium of J2EE top Practices hasn't ever been higher. Java company top Practices specializes in the Java 2 firm variation (J2EE) APIs. The J2EE APIs contain such alphabet soup acronyms as EJB, JDBC, RMI, XML, and JMX.
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Some enable the separation of concerns; some enforce it. Security integration The default servlet access control and security model works for simple tasks but isn't extensible for more advanced needs. Some frameworks provide alternative security models, and many support pluggable security models. If you've ever wanted more advanced security control, the right framework can help. Form validation Frameworks commonly provide tools to validate form data, allowing the framework to sanity-check parameters before the servlet even sees the data, for example.
A controller can look up concrete Action subclasses by name and delegate requests to them. The book gives code samples for how to implement an Action but doesn't provide any production-quality support code. For production code, the J2EE BluePrints book points readers to Apache Struts. org/struts) might very well be the most popular servlet framework. It follows very closely the MVC pattern discussed in BluePrints (from what I can tell, the ideas have flowed in both directions): Struts is highly configurable, and has a large (and growing) feature list, including a Front Controller, action classes and mappings, utility classes for XML, automatic population of server-side JavaBeans, Web forms with validation, and some internationalization support.
The server holds a server-side hashtable that associates the cookie ID keys with HttpSession object values. getSession( ) , the server gets the cookie ID, looks up the appropriate HttpSession, and returns it. To keep memory in check, after some period of inactivity (typically 30 minutes) or on programmer request, the session expires and the stored data is garbage-collected. Session data is inherently transient and fragile. Session data will be lost when a session expires, when a client shuts down the browser,[2] when a client changes browsers, when a client changes machines, or when a servlet invalidates the session to log out the user.