Java J2EE Question and Answers

37. How do we package J2EE component?
 
  • J2EE components are packaged separately and bundled into a J2EE application for deployment. Each component, its related files such as GIF and HTML files or server side utility classes, and a deployment descriptor are assembled into a module and added to the J2EE application.
  • A J2EE application is composed of one or more enterprise bean, Web, or application client component modules.
  • The final enterprise solution can use one J2EE or be made up of two or more J2EE applications, depending on design requirements.
  • A J2EE application and each of its module has its own deployment descriptor.
  • A deployment is an XML document with an .xml extension that describes a component's deployment settings.
 
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38. What is XML registry?
 
  • An infrastructure that enables the building, deployment and discovery of Web services.
  • It is a neutral third party that facilitates dynamic and loosely coupled business to business (B2B) interactions.
 
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39. What is transaction?
 
  • An atomic unit of work that modifies data.
  • A transaction encloses one or more program statements, all of which either complete or roll back.
  • Transactions enable multiple users to access the same data concurrently.
 
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40. What is Web application?
  An application written for the Internet, including those built with Java technologies such as JavaServer Pages and servlets, as well as those built with non Java technologies such as CGI and Perl.
 
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