Servlet Interview questions and Answers
The Servlet is a class used in Java applications for enhancing the capabilities of the server. Java servlets run on web application server container and are used to generate HTML content that shows on the web browser. Servlets respond to request from the browser and return response content. Our new collection of Servlet interview questions is a must-read for all developers. Servlets are mostly implemented for HTTP protocol and are also called as HTTP Servlet.
| About Servlet | |
|---|---|
| What is Servlet | Servlets generate dynamic HTML content and respond with excel, XML, pdf, and JSON and other formats. Initially, servlets were meant for creating HTML content in applications, but now they are mostly used at the controller layers. |
| Latest Version | 4.0, released in September 2017. |
| Created By | Pavni Diwanji |
| Specification | JSR 369 |
| Platform | Java EE 8 |
| Important Changes | HTTP/2 |
Most Frequently Asked Servlet Interview questions
Servlet 3.0 has introduced javax.servlet.annotation that provides annotation types, which can annotate servlet classes. Annotation also represents metadata. So, if you are using annotation, you may not require deployment descriptor.
Note: This is very essential java servlet interview questions which is asked in every interviews.
| Web Server | Web Container | |
|---|---|---|
| 1. | Provides Request and response for HTTP . | Ensures servlet objects life style is maintained. |
| 2. | Handles client request through HTTP. | Uses service method for some servlet objects . |
| 3. | Delivers resources and data of web pages . | Responsible for running the servlets . |
| 4. | Serves static content. | Serves dynamic content |
| 5. | Superset | Only a part of a superset |
| Servlet | JSP | |
|---|---|---|
| 1. | Java code | HTML-based code |
| 2. | Acts like a controller in MVC. | View for showing output in MVC approach. |
| 3. | Accepts protocol requests. | Accepts only HTTP requests. |
| 4. | May override service() method. | Not possible to override service() method. |
Accepting a request from the browser and processing it using multiple servlets in a chain is called Servlet Chaining. In this process, communication occurs between chains of servlets and servlet programs in order to process the client's request. This process may make the user requests visible to multiple servlets.
Note: This is a very important Servlet Interview Questions.
For example, if you are jogging a Graphical User Interface (GUI) program, click on a button can be a scenario of interest.
An Quick Overview of Servlet
In Java, servlets generate dynamic HTML content and respond with excel, XML, pdf, and JSON and other formats. Initially, servlets were meant for creating HTML content in applications, but now they are mostly used at the controller layers.
Our jsp servlet interview questions for experienced professionals is a huge hit amongst potential candidates looking for new jobs. Have you read them yet?
Development History of Servlet
Servlet 1.0 was released on June 1997.
Latest Version
Latest Version: Servlet 4.0 is the newest version that was released on September 2017 on the Java EE 8 platform. You should read in-depth about different versions and their features if you are preparing for tricky jsp and servlet interview questions .