Skip to main content

25 Best JSP Interview Questions and Answers - Java J2EE

What Is JSP?
JSP stands for Java Server Page.
JSP are internally converted to Servlet (.class) for processing Java code.
JSP is a server side technology which is used for creating dynamic web pages.
JSP is an extension of Servlets.
JSP comes with SUN’s J2EE platforms.

What Are the Advantages of JSP?
JSP enables server side programming abilities.
JSP represents HTML pages embed with Java code.
JSP is cross platform technology.
JSP can create database driven Web applications.

Is JSP Technology extensible?
Yes!, JSP is an extensible by using the modification of tags.

What Are the JSP Life Cycle?
The JSP life-cycle is defined as the process started with its creation which later translated to a servlet and afterward servlet life-cycle comes into play.

A JSP Life cycle consists of following steps:
1.      Translation of JSP to Servlet code
2.      Compilation of Servlet to byte code
3.      Loading Servlet class
4.      Creating servlet instance
5.      Initialization by calling jspInit() method
6.      Request Processing by calling _jspService() method
7.      Destroying by calling jspDestroy() method

Compilation process of JSP page involves three steps:
1.      Parsing of JSP
2.      Turning JSP into servlet
3.      Compiling the servlet

What Are JSP Life Cycle methods?
The JSP Life Cycle methods are:

The jspInit() method - It is invoked only once.
The _jspService() method - It is invoked at each request.
The jspDestroy() method - It is invoked only once.
We can override jspInit(), jspDestroy() but we can’t override _jspService() method.

Which JSP lifecycle methods can be overridden? How?
The jspInit() and jspDestroy() methods can be overridden within a JSP page.

What Are the Implicit Objects in JSP?
Objects created by web container and contain information regarding a particular request, application or page is called Implicit Objects. 

The implicit objects are:
1.      Request
2.      Response
3.      PageContext
4.      Session
5.      Application
6.      Out
7.      Config
8.      Page
9.      Exception

What do JSP literals consist of?
1.      Boolean
2.      Integer
3.      Floating point
4.      String
5.      Null

How Many Types of Tags exist in the JSTL library?
1.      Core Tags
2.      Localization Tags
3.      Formatting Tags
4.      XML Tags
5.      JSTL Functions Tags
6.      SQL Tags

You can create JSP Custom Tags with the below items:
1.      JSP Custom Tag Handler
2.      Creating Tag Library Descriptor (TLD) File
3.      Deployment Descriptor Configuration (DDC) for TLD

What Are the three Tags used in JSP bean development?
1.      <jsp: useBean>
2.      <jsp: setProperty>
3.      <jsp: getProperty>

What Are the Standard Actions Available in JSP?
The standard actions are:
1.      <jsp: include>
2.      <jsp: forward>
3.      <jsp: useBean>
4.      <jsp: setProperty>
5.      <jsp: getProperty>
6.      <jsp: param>
7.      <jsp: plugin>

How can a thread safe JSP page be implemented?
Yes!, by implemented the SingleThreadModel Interface.
Add <%@page isThreadSafe="false" %> directive in the JSP page.

What Is the difference between ServletContext and PageContext?
The ServletContext gives the information about the container while PageContext gives about the Request.

Is JSP used in the MVC model?
Yes!, JSP used MVC pattern (Model View Controller) for presentation.

What Is the function of <jsp:include> action?
The syntax − <jsp:include page = "relative URL" flush="true" />

Where page is the relative URL of the page to be included
Where flush is the Boolean attribute determines whether the included resource has its buffer flushed before it is included.

What Is a Request object?
The Request object is an instance of javax.servlet.http.HttpServletRequest. Each time a client request a page the JSP engine create a new object to represent that request.

What Is a Response object?
The Response object is an instance of a javax.servlet.http.HttpServletRequest and server create the request object.

What Is Composition?
The Composition has a stronger relationship with the object than Aggregation.

What Is JSTL?
JSP Standard Tag Library is a library of predefined tags that ease the development of JSP.

How To disable session in JSP?
Using the - <%@ page session="false" %>  

What Are Different Types of comments in JSP?
The JSP pages provide two types of comments:
HTML Comments - <!-- HTML Comment -->
JSP Comments - <%-- JSP Comment --%>

Can we use JavaScript with JSP Pages?
Yes!, Why Not. We can use as per your needs.

How Many Scripting Elements in JSP?
There are three scripting language elements:
1.      Declarations
2.      Scriptlets
3.      Expressions

Explain the different attributes of a page directive?
Here 13 attributes available for a page directive and some of the important attributes are:
1.      <import>
2.      <session>
3.      <contentType>
4.      <isELIgnored>

Is it possible from a JSP page to process HTML form content?
Yes!, It is possible.

More Java Programming Interview Questions...
By Anil Singh | Rating of this article (*****)

Popular posts from this blog

nullinjectorerror no provider for httpclient angular 17

In Angular 17 where the standalone true option is set by default, the app.config.ts file is generated in src/app/ and provideHttpClient(). We can be added to the list of providers in app.config.ts Step 1:   To provide HttpClient in a standalone app we could do this in the app.config.ts file, app.config.ts: import { ApplicationConfig } from '@angular/core'; import { provideRouter } from '@angular/router'; import { routes } from './app.routes'; import { provideClientHydration } from '@angular/platform-browser'; //This (provideHttpClient) will help us to resolve the issue  import {provideHttpClient} from '@angular/common/http'; export const appConfig: ApplicationConfig = {   providers: [ provideRouter(routes),  provideClientHydration(), provideHttpClient ()      ] }; The appConfig const is used in the main.ts file, see the code, main.ts : import { bootstrapApplication } from '@angular/platform-browser'; import { appConfig } from '

39 Best Object Oriented JavaScript Interview Questions and Answers

Most Popular 37 Key Questions for JavaScript Interviews. What is Object in JavaScript? What is the Prototype object in JavaScript and how it is used? What is "this"? What is its value? Explain why "self" is needed instead of "this". What is a Closure and why are they so useful to us? Explain how to write class methods vs. instance methods. Can you explain the difference between == and ===? Can you explain the difference between call and apply? Explain why Asynchronous code is important in JavaScript? Can you please tell me a story about JavaScript performance problems? Tell me your JavaScript Naming Convention? How do you define a class and its constructor? What is Hoisted in JavaScript? What is function overloadin

List of Countries, Nationalities and their Code In Excel File

Download JSON file for this List - Click on JSON file    Countries List, Nationalities and Code Excel ID Country Country Code Nationality Person 1 UNITED KINGDOM GB British a Briton 2 ARGENTINA AR Argentinian an Argentinian 3 AUSTRALIA AU Australian an Australian 4 BAHAMAS BS Bahamian a Bahamian 5 BELGIUM BE Belgian a Belgian 6 BRAZIL BR Brazilian a Brazilian 7 CANADA CA Canadian a Canadian 8 CHINA CN Chinese a Chinese 9 COLOMBIA CO Colombian a Colombian 10 CUBA CU Cuban a Cuban 11 DOMINICAN REPUBLIC DO Dominican a Dominican 12 ECUADOR EC Ecuadorean an Ecuadorean 13 EL SALVADOR

25 Best Vue.js 2 Interview Questions and Answers

What Is Vue.js? The Vue.js is a progressive JavaScript framework and used to building the interactive user interfaces and also it’s focused on the view layer only (front end). The Vue.js is easy to integrate with other libraries and others existing projects. Vue.js is very popular for Single Page Applications developments. The Vue.js is lighter, smaller in size and so faster. It also supports the MVVM ( Model-View-ViewModel ) pattern. The Vue.js is supporting to multiple Components and libraries like - ü   Tables and data grids ü   Notifications ü   Loader ü   Calendar ü   Display time, date and age ü   Progress Bar ü   Tooltip ü   Overlay ü   Icons ü   Menu ü   Charts ü   Map ü   Pdf viewer ü   And so on The Vue.js was developed by “ Evan You ”, an Ex Google software engineer. The latest version is Vue.js 2. The Vue.js 2 is very similar to Angular because Evan You was inspired by Angular and the Vue.js 2 components looks like -

55 Best TypeScript Interview Questions and Answers - JavaScript!

What Is TypeScript? By definition, "TypeScript is a typed superset of JavaScript that compiles to plain JavaScript." TypeScript is a superset of JavaScript which provides optional static typing, classes and interfaces. => The TypeScript was first made public in the year 2012. => Typescript is a modern age JavaScript development language. => TypeScript is a strongly typed, object oriented, compiled language. => TypeScript was designed by Anders Hejlsberg (designer of C#) at Microsoft. => TypeScript is both a language and a set of tools. As an Example of TypeScript, class Hello {     msg : string ;      constructor ( message : string ) {          this . msg = message ;      }       getMsg () {          return "Hello, " + this . msg ;      } } TypeScript introduced a great deal of syntax taken from object-oriented programming, including but not limited to: 1) Interfaces 2) Classes 3) Enumerated t