Advanced Java Beginners Guide Ep.6 – JSP and Servlet Integration for Web Applications (Updated June 2026)

Before React, Angular, and Vue, there was Servlet and JSP — and the good news is that millions of enterprise Java applications still run on this foundation today. JSP (Java Server Pages) and Servlets are the server-side Java technologies that process HTTP requests, interact with databases through JDBC, and generate dynamic HTML responses. With NASSCOM-Deloitte projecting demand for 1.25 million advanced tech professionals in India by 2027, and with Infosys, TCS, and Wipro still running massive Servlet-based legacy systems for banking and government clients, understanding JSP and Servlet integration is a core employable skill for any Java developer in Pune. Episode 6 takes you from Servlet lifecycle basics through JSP scripting elements, form handling, session management, and MVC architecture on Apache Tomcat.

▶ Watch on YouTube

What Is a Servlet and How Does It Handle HTTP Requests

A Servlet is a Java class that runs on a web server (inside a Servlet container like Apache Tomcat) and responds to HTTP requests. When a browser sends a GET request to /login, Tomcat finds the Servlet mapped to /login, calls its doGet() method, and the Servlet generates an HTTP response — either HTML, JSON, or a redirect. Every Servlet extends HttpServlet and overrides doGet() for GET requests and doPost() for POST requests (form submissions). The Servlet lifecycle has three phases: init() called once when Tomcat loads the Servlet, service() called for every incoming HTTP request (which dispatches to doGet or doPost), and destroy() called when Tomcat unloads the Servlet. What most people don't realise is that Spring Boot — the framework used at every modern Indian IT company — is just a sophisticated layer on top of the Java Servlet API. If you don't understand Servlets, Spring Boot is a black box you cannot debug.

JSP Basics – Embedding Java in HTML for Dynamic Pages

JSP (Java Server Pages) is a technology that lets you write HTML templates with embedded Java code. The JSP file is compiled by Tomcat into a Servlet the first time it is requested, then cached for subsequent requests. JSP has three types of scripting elements: Scriptlets (Java code inside <% %> tags), Expressions (output a value using <%= expression %> ), and Declarations (declare instance variables or methods using <%! %>). JSP also has built-in implicit objects: request (the HttpServletRequest), response (the HttpServletResponse), session (the HttpSession), out (the PrintWriter for output), and application (the ServletContext). In modern practice, you minimise Java in JSP — JSP should contain HTML and display logic only. Business logic belongs in the Servlet. The good news is that JSTL (JSP Standard Tag Library) provides HTML-like tags for iteration (c:forEach) and conditions (c:if) so you can write clean JSP without scriptlets entirely.

Servlet and JSP Integration – The MVC Pattern

The Model-View-Controller (MVC) pattern is the standard architecture for Servlet/JSP web applications. The Controller is a Servlet that receives the HTTP request, validates input, calls business logic, and forwards to the appropriate JSP view. The View is a JSP file that only displays data — no database calls, no business logic, just HTML with data injected from request attributes. The Model is a JavaBean (a plain Java class with private fields and public getters/setters) that carries data between the Controller and the View via request.setAttribute(). A complete example: browser POST /addStudent → StudentServlet.doPost() validates form, calls StudentDAO.insert(student) to write to MySQL via JDBC, sets a success message attribute, forwards to confirmation.jsp which displays the message. This three-layer separation makes applications maintainable, testable, and scalable — exactly what employers at Infosys, KPIT, and Persistent Systems look for.

Session Management, Cookies, and Form Handling

HTTP is stateless — each request is independent, and the server does not remember the previous one. Session management solves this. The HttpSession object stores user-specific data across multiple requests: session.setAttribute("user", userObject) stores the logged-in user object; session.getAttribute("user") retrieves it on the next request. Cookies are small key-value pairs stored in the browser that the server sends with Set-Cookie headers and reads on subsequent requests — used for remember-me functionality and tracking. Form handling in Servlets is done with request.getParameter("fieldname") — this retrieves the value of any named form input from a POST or GET request. Validating all form inputs is critical: never trust user input directly, always check for null, empty strings, SQL injection attempts, and type validity before passing data to your DAO or database. This is the defensive programming habit that separates a professional Java developer from a student.

Deploying Your Application on Apache Tomcat

Apache Tomcat is the reference implementation of the Java Servlet and JSP specifications — it is free, open-source, and runs on Windows, Linux, and macOS. To deploy a web application: package your compiled classes, JSPs, and web.xml configuration into a WAR file (Web ARchive), then drop the WAR into Tomcat's webapps directory. Tomcat auto-deploys it at the path matching the WAR file name. Access your app at http://localhost:8080/yourappname. In Eclipse IDE, you add a Tomcat server configuration, right-click your project, and choose Run on Server — Tomcat starts, deploys your project, and opens a browser automatically. In IntelliJ IDEA, the process is similar via Run Configurations. For production: Tomcat runs as a Linux service behind an Nginx reverse proxy on cloud VMs (AWS EC2, Azure, or on-premise servers). At Infosys and TCS, hundreds of Tomcat instances serve enterprise web applications around the clock.

Java Web Development Careers in Pune and Maharashtra

Java web development roles are plentiful across Maharashtra. In Pune: Infosys (Rajiv Gandhi IT Park, Hinjewadi), TCS (Yantra Park, Hadapsar), Wipro (SEZ, Kharadi), KPIT Technologies (Viman Nagar), Persistent Systems (Nagpur Road) and Capgemini (Magarpatta) all hire Java web developers regularly. Freshers with solid Servlet/JSP and Spring Boot fundamentals from a recognised training institute are consistently placed in these companies through campus and off-campus channels. In Sambhajinagar: Cidco IT Park and the TCS Learning Hub near Cidco are the primary IT employer locations. In Sangli: Infosys BPM and local IT product companies around Sangli-Miraj road hire Java developers with web experience. According to AmbitionBox, a fresher Java web developer earns ₹4–6 LPA at major IT services firms in Pune. With 2-3 years of Advanced Java (Servlets, JSP, Spring Boot) experience, salary grows to ₹8–14 LPA. ABC Trainings places graduates directly into companies through its active placement cell — call 7039169629 to know the current batch dates and placement track record.

CMYKPY Scholarship: Maharashtra's CMYKPY scheme offers ₹6,000–₹10,000 for skill training to eligible youth. With NASSCOM-Deloitte projecting 1.25 million AI and tech roles by 2027, IT and Java web development skills are among the most future-proof investments you can make. Check your CMYKPY eligibility before you enroll. Call 7039169629 or WhatsApp 7774002496.

FAQs

What is the difference between a Servlet and JSP in Java web development?

A Servlet is a Java class that runs inside a Servlet container (like Apache Tomcat) and handles HTTP requests — receiving form data, querying databases, and generating responses. Servlets are best used for the controller logic: validation, JDBC calls, session management, and forwarding to a view. JSP (Java Server Pages) is an HTML template with embedded Java code that Tomcat automatically compiles into a Servlet. JSP is best used for the view: displaying data, rendering forms, and generating dynamic HTML without writing print statements in Java. In MVC architecture, Servlets serve as Controllers and JSP files serve as Views.

What is the MVC pattern in Servlet and JSP web applications?

The MVC (Model-View-Controller) pattern in Servlet/JSP web apps assigns distinct roles: the Controller is a Servlet that receives HTTP requests, validates input, calls business logic, and forwards to the appropriate JSP. The View is a JSP file that only displays data — no database calls or business logic. The Model is a JavaBean (plain Java class with getters and setters) that carries data between Controller and View via request.setAttribute(). MVC makes applications easier to maintain, test, and scale — and it is the foundational pattern that Spring MVC and Spring Boot are built on.

How do you deploy a Java Servlet/JSP application on Apache Tomcat?

To deploy a Servlet/JSP application on Apache Tomcat: (1) compile your Java source files and package them with your JSP files, static resources, and WEB-INF/web.xml into a WAR file. (2) Copy the WAR file into Tomcat's webapps directory. (3) Start or restart Tomcat — it automatically extracts and deploys the WAR. (4) Access your application at http://localhost:8080/your-app-name. In Eclipse IDE, you can use the "Add and Remove" dialog to deploy directly to a Tomcat server configured in the IDE. In IntelliJ IDEA, use Run Configurations with a Tomcat Local server.

What is the salary of a Java web developer in Pune?

According to AmbitionBox, a fresher Java web developer at Infosys, TCS, Wipro, or Cognizant earns ₹4–6 LPA CTC in Pune. With 2-3 years of Advanced Java experience (Servlets, JSP, Spring Boot, REST APIs), salary grows to ₹8–14 LPA. Senior Java architects and tech leads earn ₹18–32 LPA at product companies and MNCs. Pune is one of India's strongest Java job markets due to the concentration of Infosys, KPIT, Persistent Systems, Capgemini, and Symantec engineering offices.