JSP Interview Questions and Answers for 5 years experience

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JSP Interview Questions and Answers (5 Years Experience)

  1. What is JSP?

    • Answer: JSP (JavaServer Pages) is a server-side programming technology that enables web developers to create dynamic web pages based on HTML, XML, or other document types. It uses Java code embedded in HTML pages to generate dynamic content.

  2. Explain the life cycle of a JSP page.

    • Answer: The JSP lifecycle consists of several phases: compilation, initialization, request processing, and cleanup. First, the JSP is translated into a servlet. Then, the servlet is loaded and initialized. Each request triggers the servlet's `service()` method, which processes the request and generates a response. Finally, the servlet is destroyed when the application is shut down.

  3. What are JSP directives? Give examples.

    • Answer: JSP directives provide instructions to the JSP container. Examples include `<%@ page %>` (sets page-specific attributes like language, import, etc.), `<%@ include %>` (includes a file at translation time), and `<%@ taglib %>` (declares custom tags).

  4. What are JSP actions? Give examples.

    • Answer: JSP actions are used to control the behavior of the JSP page during request processing. Examples include ``, ``, ``, and ``.

  5. Explain the difference between `include` directive and `include` action.

    • Answer: The `include` directive includes a file at translation time, resulting in a single servlet. The `include` action includes a file at request time, allowing for dynamic content inclusion.

  6. What are implicit objects in JSP?

    • Answer: Implicit objects are predefined objects available within a JSP page without explicit declaration. Examples include `request`, `response`, `session`, `application`, `out`, `page`, `config`, `exception`.

  7. Explain the use of the `session` object.

    • Answer: The `session` object provides a mechanism to store data specific to a user's session. This allows maintaining state across multiple requests from the same user.

  8. How do you handle exceptions in JSP?

    • Answer: Exceptions can be handled using standard Java `try-catch` blocks within the JSP scriptlets or by configuring error pages using the `<%@ page errorPage="error.jsp" %>` directive.

  9. What are custom tags in JSP?

    • Answer: Custom tags extend the functionality of JSP by allowing developers to create reusable components. They encapsulate complex logic within a simple tag, improving code readability and maintainability.

  10. Explain the use of JSTL (JSP Standard Tag Library).

    • Answer: JSTL provides a set of standard tags for common tasks like looping, conditional logic, and XML manipulation, reducing the need for scriptlets and improving code readability.

  11. What are EL (Expression Language) expressions?

    • Answer: EL expressions are used to access data stored in objects like request, session, and application scope. They simplify accessing data and improve the separation of presentation from business logic.

  12. How do you prevent JSP injection vulnerabilities?

    • Answer: Use parameterized queries or prepared statements when interacting with databases. Properly sanitize and escape user input to prevent malicious code injection. Utilize frameworks that offer built-in protection against injection attacks.

  13. Describe your experience with JSP frameworks like Struts or Spring MVC.

    • Answer: [This requires a personalized answer based on your actual experience. Describe specific projects, technologies used, and challenges overcome. Example: "I have extensive experience with Spring MVC, utilizing its features for dependency injection, model-view-controller architecture, and RESTful web services development. I've worked on projects involving..." ]

  14. How do you handle different HTTP methods (GET, POST) in JSP?

    • Answer: You can check the HTTP method using the `request.getMethod()` method in a servlet or within a JSP scriptlet. This allows you to handle different requests differently (e.g., GET for retrieving data, POST for submitting forms).

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