JSP Interview Questions With Answers 2023 [Top 10 Interview Question]

JSP Interview Questions With Answers: JSP (Java Server Pages) is a technology used for creating dynamic web pages in Java. It allows developers to embed Java code into HTML pages, making it easier to create web applications that generate dynamic content.

JSP pages are compiled into Java Servlets, which are Java classes that run on the server side to generate dynamic web pages. JSP technology provides a way for developers to separate the presentation layer from the business logic layer of an application, making it easier to maintain and update web pages.

JSP technology provides a set of predefined tags and functions that can be used to generate dynamic content, such as database queries, form processing, and user authentication. JSP pages can also include Java code and custom tags, allowing developers to extend the functionality of JSP.

JSP technology is often used in combination with other Java technologies, such as Servlets, JavaBeans, and JDBC, to create complex web applications that interact with databases, APIs, and other backend systems.

JSP Interview Questions With Answers 2023

Q: What is JSP?

A: JSP stands for Java Server Pages. It is a server-side technology that allows developers to create dynamic web pages by embedding Java code into HTML pages.

Q: What is the difference between JSP and Servlet?

A: Servlet is a Java program that runs on the server side, whereas JSP is a technology that allows developers to embed Java code into HTML pages. Servlets are more powerful than JSPs, but they are more difficult to use.

Q: What are the advantages of using JSP?

A: The advantages of using JSP include:

  1. It simplifies the development of dynamic web pages.
  2. It allows for the separation of presentation and business logic.
  3. It provides easy integration with databases and other backend systems.
  4. It can be easily extended and customized.

Q: What is the JSP lifecycle?

A: The JSP lifecycle consists of the following phases:

  1. Translation: The JSP engine converts the JSP code into a servlet.
  2. Compilation: The servlet is compiled into a class file.
  3. Initialization: The servlet is initialized and any required resources are created.
  4. Execution: The servlet processes the request and generates the response.
  5. Destruction: The servlet is destroyed and any resources are released.

Q: How do you include a JSP page in another JSP page?

A: You can include a JSP page in another JSP page using the following syntax:

makefileCopy code<%@ include file="filename.jsp" %>

Q: What is a JSP directive?

A: A JSP directive is a special instruction that tells the JSP engine how to process a page. There are three types of directives:

  1. Page directive: Defines page-specific attributes and imports classes.
  2. Include directive: Includes content from another file at translation time.
  3. Taglib directive: Declares the use of custom tag libraries.

Q: What is a JSP expression?

A: A JSP expression is a small piece of code that is used to embed dynamic content into a JSP page. It is enclosed in <%=%> tags and can be used to display values or perform calculations.

Q: What is a JSP action?

A: A JSP action is a special tag that provides a shortcut for performing common tasks, such as including a file, forwarding a request, or setting a variable. Examples of JSP actions include jsp:include, jsp:forward, and jsp:setProperty.

Q: What is a custom tag?

A: A custom tag is a tag that is defined by the developer and can be used in a JSP page to provide functionality beyond what is available with standard JSP tags. Custom tags are defined using the taglib directive and can be implemented in Java or other scripting languages.

Q: What is JSTL?

A: JSTL (JavaServer Pages Standard Tag Library) is a set of custom tags that provide a standardized way of performing common tasks in JSP pages, such as iteration, conditional processing, and internationalization. JSTL is included with most JSP servers and can be used in any JSP page.

Q: What is EL?

A: EL (Expression Language) is a simplified way of accessing data in JSP pages. It provides a syntax for referencing variables, properties, and method calls without requiring Java code. EL is enclosed in ${} tags and can be used in conjunction with JSTL to simplify JSP page development.

JSP And Servlets Explain

JSP (Java Server Pages) and Servlets are both Java technologies used for developing dynamic web applications.

JSP is a technology that allows developers to create dynamic web pages by embedding Java code into HTML pages. JSP pages are compiled into Servlets and executed on the server side. They are typically used for presenting dynamic data to the user, such as search results, user profiles, and shopping carts.

Servlets are Java classes that run on the server side to process client requests and generate responses. They provide a powerful way to handle HTTP requests and can be used for tasks such as data validation, form processing, and database operations. Servlets can generate dynamic HTML pages, but they require more coding than JSP.

Both JSP and Servlets are typically deployed on a web server, such as Apache Tomcat or Jetty, and can interact with databases, APIs, and other backend systems to create complex web applications.

Interview Questions With Answers

JSP Servlet Example

Here is a simple example of a JSP Servlet application:

  1. Create a new Java project in your IDE of choice.
  2. Create a new Servlet class named HelloServlet:
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class HelloServlet extends HttpServlet {

    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        String name = request.getParameter("name");
        String message = "Hello, " + name + "!";
        request.setAttribute("message", message);
        request.getRequestDispatcher("hello.jsp").forward(request, response);
    }
}

This Servlet class handles GET requests and retrieves the name parameter from the request URL. It then creates a message string and sets it as an attribute in the request object. Finally, it forwards the request to a JSP page named hello.jsp.

  1. Create a new JSP page named hello.jsp:
<!DOCTYPE html>
<html>
<head>
	<meta charset="UTF-8">
	<title>Hello JSP</title>
</head>
<body>
	<h1>${message}</h1>
</body>
</html>

This JSP page retrieves the message attribute from the request object using Expression Language and displays it in an HTML heading.

  1. Deploy the application to a web server, such as Apache Tomcat or Jetty.
  2. Access the application in a web browser by navigating to http://localhost:8080/hello?name=John (replace localhost and 8080 with your server’s hostname and port number). You should see a greeting message that says “Hello, John!”.

This simple example demonstrates how JSP and Servlets can be used together to create a dynamic web application that responds to user input.

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JSP Interview Questions With Answers

Web Application using JSP and servlet source code

As a language model, I do not have access to a specific web application’s source code. However, I can provide a basic example of a web application using JSP and Servlets:

  1. Create a new Java project in your IDE of choice.
  2. Create a new Servlet class named LoginServlet:
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

public class LoginServlet extends HttpServlet {

    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        String username = request.getParameter("username");
        String password = request.getParameter("password");
        
        if (username.equals("admin") && password.equals("password")) {
            HttpSession session = request.getSession();
            session.setAttribute("username", username);
            response.sendRedirect("home.jsp");
        } else {
            response.sendRedirect("error.jsp");
        }
    }
}

This Servlet class handles POST requests and retrieves the username and password parameters from the request body. It checks if the credentials are correct and, if so, creates a new session and sets the username attribute. It then redirects the user to a JSP page named home.jsp, or to an error page named error.jsp if the credentials are incorrect.

  1. Create a new JSP page named login.jsp:
<!DOCTYPE html>
<html>
<head>
	<meta charset="UTF-8">
	<title>Login Page</title>
</head>
<body>
	<h1>Login Page</h1>
	<form method="post" action="login">
		<label>Username:</label><br>
		<input type="text" name="username"><br>
		<label>Password:</label><br>
		<input type="password" name="password"><br>
		<input type="submit" value="Login">
	</form>
</body>
</html>

This JSP page displays a login form that allows the user to enter their username and password. The form submits a POST request to the LoginServlet.

  1. Create a new JSP page named home.jsp:
<!DOCTYPE html>
<html>
<head>
	<meta charset="UTF-8">
	<title>Home Page</title>
</head>
<body>
	<h1>Welcome, ${sessionScope.username}!</h1>
	<a href="logout">Logout</a>
</body>
</html>

This JSP page displays a welcome message that includes the user’s username, retrieved from the session object using Expression Language. It also includes a logout link that submits a GET request to a LogoutServlet.

  1. Create a new Servlet class named LogoutServlet:
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

public class LogoutServlet extends HttpServlet {

    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        HttpSession session = request.getSession();
        session.removeAttribute("username");
        session.invalidate();
        response.sendRedirect("login.jsp");
    }
}

This Servlet class handles GET requests and removes the username attribute from the session object, invalidates the session, and redirects the user to the login.jsp page.

  1. Deploy the application to a web server, such as Apache Tomcat or Jetty.
  2. Access the application in a web browser by navigating to http://localhost:8080/login.jsp (replace localhost and 8080 with your server’s hostname and port number). You should see a login form that allows you to enter your username and password. If

JSP Interview Questions With Answers

Here are some JSP interview questions for fresher candidates:

  1. What is JSP?
  2. What is the difference between JSP and Servlet?
  3. What is a JSP page directive? Give some examples.
  4. What is a JSP tag?
  5. What are the different types of JSP tags?
  6. What is the use of JSP include directive?
  7. What is the use of JSP forward action?
  8. What is the use of JSP expression language?
  9. What is the difference between scriptlet and expression in JSP?
  10. What is the use of JSP custom tags?
  11. What is the use of JSP standard tags?
  12. What is the use of JSP action tags?
  13. What is the difference between include directive and include action?
  14. How can we communicate between JSP pages?
  15. What is the difference between session and application scope in JSP?
  16. What is the use of JSP implicit objects?
  17. What is the use of JSP EL operators?
  18. What is the use of JSP EL functions?
  19. What is the use of JSP EL expression?
  20. What is the use of JSP comments?

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