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Introduction to Java Servlet Interview Questions and Answers

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Now, if you are looking for a job that is related to Java Servlet then you need to prepare for the 2023 Java Servlet Interview Questions. It is true that every interview is different as per the different job profiles. Here, we have prepared the important Java Servlet Interview Questions and Answers which will help you get success in your interview.

In this 2023 Java Servlet Interview Questions article, we shall present 10 most important and frequently asked Java Servlet interview questions. These 2023 Java Servlet interview questions are divided into two parts are as follows:

Part 1 – Java Servlet Interview Questions (Basic)

This first part covers basic Interview Questions and Answers.

Q1. What is a Java Servlet?

A Java Servlet is a web component in which its lifecycle is managed by a servlet container present in a web server. A Servlet is nothing but a simple Java class that extends the features of a Servlet interface by implementing the Java Servlet API by conforming and complying with the Java EE standards. A servlet could establish communication in the form of a client-server protocol. A Servlet is a javax. servlet package which can be used by adding as a dependency or in a library to utilize its functionalities or features.

Q2. What are the features of Servlet?

This is the basic Interview Questions asked in an interview. The different features of a Servlet are –

It has a dependency on the Java Standard Edition version 5 i.e., J2SE 5.0.

It supports annotations features that reduce the code complexity and enables loose coupling in code.

It helps in loading the class using chúng tôi i.e. called Deployment Descriptor.

It is portable and easy to use and implement.

It is robust, efficient and scalable.

It has different features such as exception handling, garbage collection, security mechanism, etc.,

It is less prone to memory leaks and memory management faults.

Q3. What are the different phases of Java Servlet Life Cycle?

Initialization: In this stage, init() method of the servlet will be called and executed to initialize the servlet.

Service: In this stage, the service() method of the servlet is called to process the request and return the response to the client through a web server.

Destroy: In this stage, the destroy() method is called, which is the last phase of the Servlet where the servlet instance or the object will be destroyed and finally it will be garbage collected.

Q4. What are the different functionalities of the Servlet Container?

This is the basic Java Servlet Interview Questions asked in an interview. The below is the list of few functionalities of Servlet Container but are not exhausted :

It handles the life cycle management of a servlet.

It supports the communication mechanism between a web browser and the servlet.

It supports multithreading which in turn supports in the execution of the multiple servlets.

It has declarative inbuilt security features, JSP (Java Server pages) support.

It implements java enterprise architecture.

It supports concurrency, security, transaction, deployment, lifecycle management, automatic garbage collection, and a few other services.

Q5. Explain the architecture of the Servlet Life Cycle? Part 2 – Java Servlet Interview Questions (Advanced) Q6. What is HTTP Servlet? Q7. What is a Servlet Filter?

A Servlet Filter is used to filter the requests and responses of the client in a Servlet Container. This can be implemented by using filter elements in the Deployment Descriptor i.e., chúng tôi of the web application. It also performs some form of post-processing after filtering the request of the client. Servlet filters are portable and can be easily integrated with the Servlet components which are a kind of pluggable. Filters can be in multiple numbers with to filter the servlet requests and responses. The Servlet Filter lifecycle method are init(), doFilter() and destroy() which are similar to Servlet except the Service() method where the servlet will be initialized, performs filtering operations and destroys the filter instance or object.

Q8. What are the different Servlet Filters?

The different Servlet filters available are Data compression Filters, Authentication Filters, Filters which triggers the resources access events, Encryption Filters, Logging, Auditing Filters, Tokenizing Filters, and Image Conversion Filters.

Q9. What is a Session in Servlet?

This is the popular Java Servlet Interview Questions asked in an interview. A Session is a period of an interval in which the state of the Servlet is maintained in the Servlet Container. This process is called Session Management in the Servlet. Session tracking can also be maintained in Servlet by tracking the state of a user. As HTTP Servlet is stateless, Session can be used along with HttpServlet to maintain HTTP Session.

Q10. What are the different protocols supported by HttpServlet?

The different protocols supported by HTTPServlet are HTTP (Hyper Text Transfer Protocol)and HTTPS (Hyper Text Transfer Protocol Secure).