JSP Interview Questions and Answers

Last updated on Mar 08, 2022
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JSP Interview Questions

JavaServer Pages or JSP is a software-based technology that helps developers in creating dynamically generated web pages based on XML or HTML. It uses servlet containers, small programs to control the content and appearance of the web page. JSP technology can also be used to share information across pages using a response and request objects. With the help of JavaServer Page, you can easily access JavaBeans objects and make a separation in the web applications as per the business logic. To know more about JavaServer Page, we are mentioning some of the JSP Interview Questions are useful for all types of readers.

Most Frequently Asked JSP Interview Questions

Here in this article, we will be listing frequently asked JSP Interview Questions and Answers with the belief that they will be helpful for you to gain higher marks. Also, to let you know that this article has been written under the guidance of industry professionals and covered all the current competencies.

Q1. What is JSP and why it is used?

JSP or JavaServer Pages is a software technology used to develop to dynamic interactive web pages based on HTML or XML while controlling the content or appearance of web pages with the use of servlet containers. It has s wide a range of applications and separates business logic from the presentation layer.

Q2. What is the difference between include directive and include action?

Here are a few crucial differences between these two:

  • Include directive is processed at the translation time, but include action is processed at the request time.
  • Include directive uses both absolute and relative path, whereas include action only uses a relative path.
  • Include directive only uses the contents of the resource, while include action process dynamic content resource.
Q3. What are the advantages of JSP?

Using JSP has numbers of benefits, such as

  • It allows tag-based programming
  • Suitable for both Java and non-Java programmers
  • Allows developers to use separate presentation logic
  • Highly increases readability of code because of tags
  • Easy to learn and apply
Q4. What do you mean by JSP Directives?

These are the messages to JSP container, and they provide global information for an entire JSP page. JSP directives are used by developers to give special instruction to a container for translation of JSP to servlet code. These directives can contain many attributes by comma separated as key-value pairs. JSP directives are described in <%@ %> tags.

Q5. How do you enable and disable sessions using JSP?

The session in a JSP page can be disabled by setting the session attributes to false. The following can be exampled to disable the session object using page directive: <%@ page session="false" %>

Q6. What do you mean by Custom Tag in JSP?

A JSP custom tag is a user-defined JSP language element. A JSP page which contains a custom tag is generally transcribed into a servlet. Then, the custom tag is converted to operations on an object called a tag handler. The custom tags can be created with JSP tag extensions that let developers insert these new tags directly into a JSP.

Q7. What is the difference between servlet and JSP?

JSP is a dynamic content generating webpage scripting language, whereas servlets are programs that operate on a web or application server and act as a middle layer between a request coming from applications on the HTTP server, or a web browser or other HTTP client and database.

Q8. Explain JSP lifecycle methods?

The JSP lifecycle methods are as following:

  • jspInit() : It operates to initialize the servlet instance. Before calling any other method, its call is made.
  • _jspService() : It passes the request and the response subjects. You can’t override the method.
  • jspDestroy(): The container calls this when its instance is about to destroy.
Q9. What are different types of comments used in JSP?

Basically, there are two types of comments allowed in the JSP, hidden comments and output comments.


The hidden comments of JSP don’t appear in the generated output in the HTML (ex: <%-- This is hidden comment --%>), while output comments arrear in the generated output ex: <!-- This is output comment -->).

Q10. Define Scriptlet, Expression and Declaration in JSP?

A JSP expression is used to put the Java values directly into the output. It has the form of <%= Java expression %>. JSP scriptlets are more than the simple expression and used to insert complex code into the service() method of the generated servlet. Whereas, a JSP declaration defines fields or methods that get inserted into the main body of the servlet class.

Development History

Developed and released by Sun Microsystems in 1999, JSP is similar to ASP and PHP, it uses the Java programming language for its workability. A compatible web server with a servlet container, such as Jetty or Apache Tomcat, is required to run JSP.

The program actually runs with a .jsp filename extension and application/JSP internet media type. The latest version of JSP is its 2.3 version which runs with a 4.0 version of servlet compatibility.

These JSP interview questions are specially curated highly experienced industry professionals to help candidates in their future job success.

Advantages of JSP
  • Significant performance due to the allowance of embedding Dynamic Elements in HTML Pages.
  • Easily combined with static templates, XML or HTML fragments, with code that generate dynamic contents.
  • Web authors cab change or edit the fixed template portions of web pages without affecting the application logic.
  • It offers a wide range of API to highly increase the result-oriented functionality.
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