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Last Updated: 15 Nov 2023

- Software engineer with 5+ years of experience in Java development. - Strong knowledge in programming with expertise in Spring Framework, Hibernate, and Java Core. - Proficient in using Design patterns and applying logical thinking to problem-solving. - Highly responsible and self-learning individual. - Skilled in Java technologies such as JDBC, Maven, JUnit, J2EE, JSP, and Tomcat. - Experience in working with databases like MySQL and PostgreSQL. - Familiarity with development methodologies like SCRUM and TDD.

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Evgeniy K., Java Developer

Last Updated: 6 Oct 2023

- 4+ years of experience in Java development - Strong knowledge in programming Spring Framework, Hibernate, and Java Core - Experience in using Design patterns - Good logical thinking and self-learning abilities - High level of responsibility and commitment - Knowledge of SCRUM and TDD development methodologies - Upper-intermediate level of spoken and written English - Master's degree in Mechanical Engineering - Experience in various projects, including Saas platforms, online systems, and business automation solutions - Strong understanding of software development principles, paradigms, and patterns - Proficient in SDLC and software development practices - Expertise in back-end development, bug fixing, and new feature development - Strong problem-solving and analytical skills - Excellent communication and teamwork abilities

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Java Servlets


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Evgeniy K., Java Software Engineer

Last Updated: 27 Sep 2023

- 5+ years experience in Java development - Good knowledge in programming Spring Framework, Hibernate, Java Core; - Database expertise with PostgreSQL, MySQL, and Oracle DB. - Skilled in microservices architecture and containerization using Docker and Kubernetes. - Proficient in cloud computing platforms, especially AWS services such as EKS, DynamoDB, S3, and SQS. - Experience in using Design patterns; - Upper-Intermediate English.

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Java Servlets



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Sergey S., Java Engineer

Last Updated: 4 Jul 2023

- 6+ years of professional expertise in the IT industry; - Solid experience in Java and related technologies; - Hands-on experience with Microservices architecture; - Experience in the development of Enterprise applications using Java and JEE Technologies; - Database structure design and development; - Domain and business process analysis and modeling - Upper-Intermediate English - Available ASAP

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Java Servlets



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Vladyslav A., Java Software Engineer

Last Updated: 26 Sep 2023

- 5+ years experience in the IT industry working with Java and related technologies. - Good knowledge in programming Spring Framework, Hibernate, and Java Core. - Has experience with microservices architecture. - In-depth knowledge of database systems, especially PostgreSQL, and related migration tools like Flyway and Liquibase. - Proficient in AWS services such as Elastic Kubernetes Service (EKS), PostgreSQL, DynamoDB, S3, and more. - Proficiency with messaging systems like Kafka and RabbitMQ. - Demonstrated history of working on innovative projects within the green technology domain, including sophisticated statistical analysis for order processing. - Proficient in implementing and maintaining security protocols and access control using Spring Security. - Upper-Intermediate English.

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Java Servlets

Java Servlets



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Table of Contents

TOP 10 Java Servlets Related Technologies

  • Java

    Java is the most popular programming language for Java Servlets software development. It provides a robust and secure platform for building web applications. With a large community and extensive library support, Java is widely used in enterprise-level applications.

  • Servlets

    Servlets are the foundation of Java Servlets software development. They are Java classes that extend the functionality of a web server and handle requests and responses. Servlets provide a powerful mechanism for dynamic web content generation and are widely used in web applications.

  • JavaServer Pages (JSP)

    JSP is a technology that allows the creation of dynamic web pages using Java. It enables the separation of presentation logic from business logic and provides a convenient way to generate HTML content dynamically. JSP is widely used in conjunction with servlets for building Java Servlets applications.

  • Apache Tomcat

    Apache Tomcat is a popular web server and servlet container for Java Servlets development. It provides a lightweight and efficient runtime environment for deploying Java web applications. Tomcat is widely used in production environments due to its stability and scalability.

  • Spring Framework

    Spring is a widely adopted Java framework that provides a comprehensive infrastructure for Java Servlets development. It offers features like dependency injection, aspect-oriented programming, and transaction management. Spring simplifies the development process and promotes code reusability and maintainability.

  • Hibernate

    Hibernate is a powerful object-relational mapping (ORM) framework for Java. It simplifies database access by mapping Java objects to database tables. Hibernate handles the complexities of data retrieval, storage, and manipulation, allowing developers to focus on business logic. It is widely used in Java Servlets applications for database integration.

  • JUnit

    JUnit is a popular testing framework for Java. It provides a simple and efficient way to write unit tests for Java Servlets applications. JUnit allows developers to verify the correctness of their code and ensure expected behavior. It is widely used in test-driven development and continuous integration practices.

TOP 12 Facts about Java Servlets

  • Java servlets are server-side programs that run on a web server and handle client requests and responses.
  • Servlets are part of the Java Enterprise Edition (Java EE) platform, which provides a robust framework for developing enterprise-level applications.
  • Servlets follow the Model-View-Controller (MVC) architectural pattern, allowing for separation of concerns and easier maintenance of code.
  • Servlets are platform-independent and can be deployed on any web server that supports the Java Servlet API.
  • Servlets can handle various types of requests, including GET, POST, PUT, DELETE, and more, making them versatile for different application scenarios.
  • Servlets can dynamically generate HTML, XML, or other types of responses, allowing for dynamic content generation on web pages.
  • Servlets can maintain session state, allowing developers to create interactive and personalized web applications.
  • Servlets can be used in conjunction with JavaServer Pages (JSP) to create dynamic web pages that combine static HTML with Java code.
  • Servlets provide a powerful mechanism for handling form submissions, processing user input, and validating data on the server side.
  • Servlets are highly scalable and can handle multiple concurrent requests efficiently, making them suitable for high-traffic websites.
  • Servlets can be integrated with various Java frameworks and technologies, such as JavaServer Faces (JSF), Spring MVC, and Struts, to build robust and feature-rich web applications.
  • The Java Servlet API provides a rich set of classes and interfaces for developers to extend and customize the behavior of servlets, enabling them to build complex web applications.

Pros & cons of Java Servlets

7 Pros of Java Servlets

  • Efficiency: Java Servlets are efficient in handling multiple requests and can handle a large number of concurrent users.
  • Platform Independence: Servlets can run on any platform that supports the Java Virtual Machine (JVM), making them highly portable.
  • Wide Adoption: Java Servlets have been widely adopted and are extensively used in enterprise-level applications.
  • Scalability: Servlets can scale horizontally by deploying them across multiple servers, allowing for increased performance and handling of high traffic loads.
  • Security: Servlets provide built-in security features that allow developers to authenticate and authorize users, ensuring secure access to resources.
  • Multithreading: Servlets can handle multiple threads simultaneously, enabling efficient processing of multiple requests concurrently.
  • Integration: Servlets seamlessly integrate with other Java technologies, such as JavaServer Pages (JSP) and Enterprise JavaBeans (EJB), providing a robust and comprehensive development environment.

7 Cons of Java Servlets

  • Complexity: Developing and maintaining Servlet-based applications can be complex, requiring a deep understanding of the Servlet API and associated frameworks.
  • Verbosity: Servlets can be verbose due to the amount of boilerplate code required for handling HTTP requests and responses.
  • Performance Overhead: Servlets may introduce performance overhead due to the initialization and instantiation of Servlet objects for each request.
  • Lack of Dynamic Content: Servlets are primarily used for generating static content, which may limit their flexibility in handling dynamic content.
  • Limited Template Support: Servlets do not provide built-in support for templating engines, often requiring the use of additional frameworks or libraries.
  • Session Management: Managing user sessions in Servlets can be challenging, especially in distributed environments.
  • Steep Learning Curve: Learning Servlet programming requires a solid understanding of Java fundamentals and the Servlet API, which can be time-consuming for beginners.

Soft skills of a Java Servlets Developer

Soft skills are essential for every Java Servlets Developer as they not only contribute to their individual success but also to the overall success of the development team. These skills go beyond technical expertise and help facilitate effective communication, collaboration, and problem-solving. Here are the soft skills required for Java Servlets Developers at different levels:


  • Adaptability: Ability to quickly learn and adapt to new technologies and frameworks.
  • Teamwork: Collaborating effectively with team members to achieve project goals.
  • Communication: Strong verbal and written communication skills to convey ideas and requirements clearly.
  • Time Management: Efficiently managing time and prioritizing tasks to meet deadlines.
  • Problem-solving: Analytical thinking and troubleshooting skills to resolve issues efficiently.


  • Leadership: Taking ownership of tasks and guiding junior developers in their work.
  • Mentoring: Sharing knowledge and providing guidance to less experienced team members.
  • Conflict Resolution: Ability to resolve conflicts and maintain a positive working environment.
  • Collaboration: Working effectively with cross-functional teams and stakeholders.
  • Attention to Detail: Paying close attention to details to ensure high-quality code and deliverables.
  • Organizational Skills: Effectively organizing and managing multiple tasks and projects simultaneously.
  • Client Management: Building and maintaining strong relationships with clients through effective communication and understanding their needs.


  • Strategic Thinking: Ability to think strategically and provide valuable insights for project planning and execution.
  • Decision Making: Making informed decisions based on analysis and experience.
  • Project Management: Ability to manage and lead development projects from start to finish.
  • Team Building: Building and nurturing high-performing development teams.
  • Innovation: Identifying and implementing innovative solutions to improve processes and outcomes.
  • Empathy: Understanding and empathizing with team members and stakeholders.
  • Negotiation: Negotiating effectively with clients and stakeholders to achieve mutually beneficial outcomes.
  • Continuous Learning: Keeping up-to-date with the latest trends and technologies in Java Servlets development.

Expert/Team Lead

  • Strategic Planning: Developing long-term strategies and roadmaps for application development.
  • Technical Leadership: Providing technical guidance and mentorship to the development team.
  • Project Estimation: Estimating project timelines, effort, and resource requirements accurately.
  • Risk Management: Identifying and mitigating risks to ensure successful project delivery.
  • Stakeholder Management: Building and maintaining strong relationships with key stakeholders.
  • Business Acumen: Understanding business requirements and aligning development efforts with organizational goals.
  • Presentation Skills: Effectively presenting ideas and solutions to clients and management.
  • Conflict Management: Resolving conflicts within the team or with clients in a constructive manner.
  • Quality Assurance: Ensuring high-quality code and adherence to coding standards and best practices.
  • Technical Documentation: Creating comprehensive documentation for projects and technical specifications.
  • Team Management: Managing and developing a team of developers, providing coaching and feedback.

How and where is Java Servlets used?

Case NameCase Description
Dynamic Web Content GenerationJava Servlets enable the dynamic generation of web content by allowing developers to embed Java code within HTML pages. This allows for the customization of content based on user input or other external factors. Servlets can retrieve data from databases, perform calculations, and generate dynamic HTML responses, providing an interactive and personalized user experience.
Form ProcessingJava Servlets are commonly used for processing form data submitted by users. Servlets can receive form submissions, extract the data, perform validation, and store it in a database or perform other necessary operations. This makes them ideal for handling user registrations, contact forms, surveys, and other interactive web forms.
Session ManagementServlets provide built-in session management capabilities, allowing developers to maintain stateful interactions with users over multiple requests. This is particularly useful for applications that require user authentication, shopping carts, or maintaining user-specific preferences. Servlets can create and manage user sessions, store session data, and track user activities throughout their session.
File Upload and DownloadJava Servlets facilitate the handling of file uploads and downloads in web applications. Servlets can handle multipart form data to receive files uploaded by users, perform validation, and store the files in a designated location. Similarly, servlets can generate dynamic file downloads by reading files from the server and streaming them to the user’s browser.
Integration with External APIsServlets can act as intermediaries between web applications and external APIs, allowing seamless integration with various services and systems. This enables developers to incorporate functionalities such as payment gateways, social media sharing, geolocation services, and more into their web applications. Servlets can handle API requests, process responses, and provide a unified interface for interacting with external services.
URL Mapping and RoutingJava Servlets support URL mapping and routing, enabling developers to define specific URLs and their corresponding servlets. This allows for clean and organized URL structures, making it easier to manage and navigate web applications. Servlets can handle different URL patterns, parse parameters, and route requests to the appropriate servlets or resources.
Concurrency and ScalabilityJava Servlets are designed to handle concurrent requests efficiently, making them suitable for building scalable web applications. Servlet containers manage thread pools to handle multiple requests concurrently, ensuring optimal performance and resource utilization. This makes servlets well-suited for applications that need to handle a large number of simultaneous requests and maintain responsiveness.

What are top Java Servlets instruments and tools?

  • Apache Tomcat: Apache Tomcat is an open-source web server and servlet container developed by the Apache Software Foundation. It has been widely used since its release in 1999 and is known for its stability and performance. Apache Tomcat is the most popular Java Servlet container and has a large user base.
  • Jetty: Jetty is another popular open-source Java Servlet container and web server. It has a small footprint and is known for its scalability and performance. Jetty has been in development since 1995 and is widely used in various applications, including embedded systems and cloud-based services.
  • IBM WebSphere Application Server: WebSphere Application Server is a Java EE application server developed by IBM. It provides a runtime environment for Java Servlets, JSP, and other Java EE components. WebSphere Application Server has been continuously developed and enhanced since its initial release in 1998 and is widely used in enterprise applications.
  • JBoss AS/WildFly: JBoss AS (now known as WildFly) is an open-source Java EE application server developed by Red Hat. It supports Java Servlets, JSP, and other Java EE technologies. JBoss AS/WildFly has a modular architecture and is known for its flexibility and extensibility. It has been actively developed since its release in 1999 and has a strong community following.
  • GlassFish: GlassFish is an open-source Java EE application server developed by Oracle. It provides a runtime environment for Java Servlets, JSP, and other Java EE components. GlassFish has been widely used since its release in 2006 and is known for its ease of use and comprehensive administration console.
  • Resin: Resin is a lightweight and high-performance Java Servlet container developed by Caucho Technology. It has a small memory footprint and is optimized for speed. Resin has been in development since 1998 and has gained popularity for its performance and scalability, especially in high-traffic websites.
  • Undertow: Undertow is a lightweight, flexible, and high-performance web server and servlet container developed by Red Hat. It has a small memory footprint and is designed to be embeddable in applications. Undertow has gained popularity for its performance and simplicity, making it a popular choice for microservices and cloud-native applications.

Let’s consider Difference between Junior, Middle, Senior, Expert/Team Lead developer roles.

Seniority NameYears of experienceResponsibilities and activitiesAverage salary (USD/year)
Junior0-2 yearsAssisting with basic programming tasks, bug fixing, code reviews, and documentation. Working under the guidance of senior developers and learning new technologies and best practices.$55,000 – $75,000
Middle2-5 yearsDeveloping and maintaining software applications, implementing new features, and troubleshooting issues. Collaborating with other team members, participating in code reviews, and contributing to the technical design of projects.$75,000 – $95,000
Senior5+ yearsLeading complex development projects, designing software architectures, mentoring junior developers, and providing technical guidance. Taking ownership of critical components, optimizing performance, and ensuring high-quality code.$95,000 – $120,000
Expert/Team Lead8+ yearsLeading a team of developers, coordinating project timelines, and making strategic technical decisions. Providing expertise in a specific domain or technology, resolving complex technical challenges, and driving innovation within the team.$120,000 – $150,000

Cases when Java Servlets does not work

  1. Incorrect Servlet Mapping: One common reason why Java Servlets may not work is due to incorrect servlet mapping. The web.xml or the Java-based configuration file may have incorrect mappings defined for the servlet. This can prevent the servlet from being accessed and executed properly.
  2. Servlet Container Compatibility Issues: Java Servlets require a servlet container to run, such as Apache Tomcat or Jetty. In some cases, there may be compatibility issues between the servlet container version and the servlet version being used. This can lead to unexpected behavior or failure of the servlet to work as expected.
  3. Missing or Incorrect Servlet Dependencies: Java Servlets often depend on external libraries or frameworks. If these dependencies are missing or not properly configured, the servlet may fail to work. It is important to ensure that all required dependencies are included and correctly referenced in the project.
  4. Incorrect Request Handling: Java Servlets are designed to handle HTTP requests and provide responses. If the servlet logic is not implemented correctly to handle the specific request types (GET, POST, etc.), the servlet may not work as intended. It is essential to understand the request handling process and implement the appropriate logic.
  5. Issues with Server Configuration: Sometimes, Java Servlets may not work due to misconfigured server settings. This can include incorrect port numbers, firewall restrictions, or other network-related issues. Verifying and adjusting the server configuration can help resolve such problems.
  6. Memory or Resource Constraints: If the server hosting the Java Servlets is running low on memory or other system resources, it may impact the servlet’s performance or cause it to fail. Monitoring resource usage and allocating sufficient resources to the server can help prevent such issues.

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