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| Ans. servlet is a small, server-resident program that typically runs automatically in response to user input. A network socket is an endpoint of an inter-process communication flow across a computer network. We can think of it as a difference between door and gate. They are similar as they both are entry points but they are different as they are put up at different areas. Sockets are for low-level network communication whereas Servlets are for implementing websites and web services | ||||
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 Discuss Correct / Improve  java j2ee networking servlet socket difference between.java.net technologies architecture | ||||
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| Ans. Translation of JSP PageCompilation of JSP PageClassloading (class file is loaded by the classloader)Instantiation (Object of the Generated Servlet is created).Initialization ( jspInit() method is invoked by the container).Reqeust processing ( _jspService() method is invoked by the container).Destroy ( jspDestroy() method is invoked by the container). | ||||
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Discuss Correct / Improve j2ee servlets servelets web application jsp jsp life cycle mindtree  Asked in 9 Companies | ||||
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| Ans. The jsp scriptlet tag can only declare variables not methods whereas jsp declaration tag can declare variables as well as methods. The declaration of scriptlet tag is placed inside the _jspService() method whereas The declaration of jsp declaration tag is placed outside the _jspService() method. | ||||
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| Discuss Correct / Improve j2ee jsp scriptlet tag declaraation tag web application | ||||
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| Ans. The jsp directives are messages that tells the web container how to translate a JSP page into the corresponding servlet. There are three types of directives - page directive include directive taglib directive | ||||
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| Discuss Correct / Improve j2ee servlets servelets web application jsp jsp ldirectives | ||||
 Very frequently asked.Usually among first few questions. | ||||
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| Ans. MVC is a Design Pattern that facilititates loose coupling by segregating responsibilities in a Web application 1. Controller receives the requests and handles overall control of the request 2. Model holds majority of the Business logic, and 3. View comprise of the view objects and GUI component | ||||
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Discuss Correct / Improve j2ee mvc mvc design pattern design pattern struts spring web application web frameworks ebay Asked in 60 Companies  basic  frequent | ||||
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| Ans. Session tracking is a mechanism that servlets use to maintain state about a series requests from the same user across some period of time. The methods used for session tracking are: User Authentication - occurs when a web server restricts access to some of its resources to only those clients that log in using a recognized username and password Hidden form fields - fields are added to an HTML form that are not displayed in the client's browser. When the form containing the fields is submitted, the fields are sent back to the server URL rewriting - every URL that the user clicks on is dynamically modified or rewritten to include extra information. The extra information can be in the form of extra path information, added parameters or some custom, server-specific URL change. Cookies - a bit of information that is sent by a web server to a browser and which can later be read back from that browser. HttpSession- places a limit on the number of sessions that can exist in memory. | ||||
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| Discuss Correct / Improve j2ee servlets session session management web applications cookies httpsession url rewriting architecture Asked in 1 Companies | ||||
| Very frequently asked in companies using SOA. | ||||
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| Ans. REST or Representational State Transfer is a flexible architecture style for creating web services that recommends the following guidelines - 1. http for client server communication, 2. XML / JSON as formatiing language , 3. Simple URI as address for the services and, 4. stateless communication. | ||||
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| Discuss Correct / Improve java web services rest java j2ee architecture Asked in 14 Companies intermediate frequent | ||||
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| Ans. XML and JSON ( Javascript Object Notation ). | ||||
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| Discuss Correct / Improve java web services rest java j2ee xml json architecture basic frequent | ||||
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| Ans. Better Performance as Servlets doesn't require a separate process for a single request. Servlets are platform independent as they are written in Java. | ||||
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| Discuss Correct / Improve java j2ee servlets servelets cgi | ||||
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| Ans. http protocol on its own is stateless. So it helps in identifying the relationship between multiple stateless request as they come from a single source. | ||||
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| Discuss Correct / Improve j2ee servlets web application session httpsession architecture Asked in 1 Companies | ||||
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| Ans. Session info in the request can be intercepted and hence a vulnerability. Cookie can be read and write by respective domain only and make sure that right session information is being passed by the client. | ||||
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| Discuss Correct / Improve j2ee servlets session session management web applications cookies httpsession architecture | ||||
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| Ans. Session cookies , which are deleted once the session is over. Permanent cookies , which stays at client PC even if the session is disconnected. | ||||
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| Discuss Correct / Improve j2ee servlets session session management web applications cookies httpsession | ||||
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| Ans. stateless | ||||
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| Discuss Correct / Improve j2ee servlets session session management web applications cookies httpsession architecture | ||||
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| Ans. Jar is Java Archieve i.e compressed Class or Class / Java files. War comprises of compressed Servlet class files,JSP FIles,supporting files, GIF and HTML files. Ear comprise of compressed Java and web module files ( was files ). | ||||
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| Discuss Correct / Improve java j2ee jar web development war ear build management release management Asked in 12 Companies basic frequent | ||||
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| Ans. Struts 1 | ||||
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| Discuss Correct / Improve struts j2ee mvc frameworks struts1 struts2 | ||||
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| Ans. No | ||||
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| Discuss Correct / Improve servlets j2ee web | ||||
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Which of following class types in MVC holds Business logic ?
