Servlet interview questions and answers are dedicated to providing the most updated information and insights on its technologies.

Servlet technology is used to create and execute dynamic web apps in Java, it enable web servers to manage Java code in response to client requests.

This blog covers the Java Servlet interview questions, technology, architecture, and features.

1. What are the top three IDEs for Java developers, and which is considered the best?

The top three IDEs for Java developers are NetBeans, Eclipse, and IntelliJ, among them, IntelliJ is considered one of the best available.

2. What is typically used in academia, and what is its role in the development environment?

NetBeans is typically used for academic purposes, but it has never been used to a significant extent in the development environment.

3. How can you download and install Eclipse on your machine?

To download and install Eclipse, open your browser, search for Eclipse download, and choose the appropriate version for your OS, once downloaded, double-click on the file to get the unzipped version, and during the installation process, you will be asked to choose a workspace and set up a server.

4. What are the different perspectives in Eclipse IDE, and what do they offer?

Eclipse IDE offers several perspectives, including Java EE, Git, and JB, java EE provides features for configuring Java EE stuff, such as the server tab. By changing the reference perspective, you can see the server tab disappear.

If you click on the Java EE perspective, you can access servers working with Java EE, if you click on the Java perspective, you won’t see servers, click on the Git perspective, you won’t see servers, but you will see repositories.

5. What is the role of the server tab in Eclipse IDE?

The server tab is essential for debugging your application, and it is used to link your Tomcat server to explore your database connections.

6. What are the different perspectives available in Eclipse IDE, and what features do they provide?

Several perspectives are available for Eclipse IDE, including Java EE, Git, and JB perspectives, java EE provides features for configuring Java EE stuff, such as the server tab, the Git perspective is used for version control, and the JB perspective is used for Java Builds.

7. How can you access servers in Eclipse IDE?

You can click on the Java EE perspective to access servers when working with Java EE.

8. How do you open a project in the project explorer and switch to the Java EE perspective?

To open a project explorer project, double-click on it, to switch to the Java EE perspective, click the “Java EE” button at the bottom of the Eclipse IDE window.

9. What should you do after opening a project explorer project and switching to the Java EE perspective?

After opening a project in the project explorer and switching to the Java EE perspective, you need to click on “OK” to make the Java EE perspective active and see the server tab.

10. What happens if you switch to the Git perspective instead of the Java EE perspective in Eclipse IDE?

If you switch to the Git perspective instead of the Java EE perspective, you won’t see servers, but you will see repositories.

11. Where is the workspace located, and what is its function?

The workspace is a folder where all projects can be placed, opening it for the first time is essential, and it is displayed once Eclipse is opened.

12. What are the steps to create a new project in Eclipse?

Go to “File,” click on “New,” select “Dynamic Web Project,” and specify the project name, target runtime, and context.

13. How can a simple HTML page be created using Eclipse in a Java web project?

Right-click on the project and select “Create an HTML page.” This will create a page named index.html with all your public pages.

14. How can the output of an HTML page be seen in Eclipse?

Users can write the output on their project or right-click on the page and select “run as run on the server.”

The server will restart, and once the application is configured, it will deploy it on the Tomcat server, shifting your project into Tomcat.

15. What is Eclipse, and what are some of its features?

Eclipse is a powerful tool that allows users to test their code and design applications on various platforms. it has an internal browser, which will enable users to access any website, including Google, eclipse can also be used as a web browser for testing apps using designing tools like jQuery or Java C#.

16. How can users switch from an internal to an external browser in Eclipse?

Users can open a web browser and choose between the default or Firefox browser, to test their app on Firefox, users can click on the “Tomcat” server and select “Send server” and then “Next” and “Finish”, this will open Firefox and display the output on the browser.

17. What language is required to create a project in Web or Java?

Creating a project in web or Java requires using a server language, for example, to add two numbers, users can use JavaScript to add the first and second numbers, however, when using a server language, they need to use the server language served by the server.

18. How can two numbers be added to a form action in Firefox?

Users can use a form action with input text types, names, and break tags, the input type should be “submitted”, and the user should enter the first and second numbers, uuser should then click on the submit button to submit the request.

19. What is required for users to handle add requests in Firefox while coding?

Users must refresh the page and click on the submitted query to create a sublet for the add request, there is no dedicated “add page” to handle this request in Firefox.

20. What is Eclipse used for in application development?

Eclipse is a powerful tool for testing and developing applications on various platforms, it allows users to perform operations on servers, fetch data from databases, and perform operations requiring server processing.

21. How do you create a server in Eclipse using Java?

To create a server in Eclipse using Java, you must create a simple class that behaves like a server by extending the HTTP server class, you will use a unique package name, “calm.is”.

22. What is the role of the HTTP server class in creating a server in Eclipse?

The HTTP server class is extended to create a server in Eclipse, once opened, the class becomes a server, and you can perform any operations using methods.

23. What are the two objects required to work with a service method or any server in Eclipse?

The two objects required to work with a service method or any server in Eclipse are the request and response objects.

24. How do you perform operations using methods in a server class in Eclipse?

When the sublet is called, you can perform any operation using methods in a server class in Eclipse, the process involves passing a request object and a response object, which Tomcat creates, using these objects, you can fetch data from the client and send responses to the client.

25. What is the issue with the user clicking on a sub-media and calling an ad server?

The issue is that the user calls an ad and has a server time, which is confusing, to resolve this, the author needs to understand the flow of the application.

26. Where should the sublet tag and sublet mapping tag be created?

One sublet tag and one sublet mapping tag should be created for every sublet to avoid confusion about which sublet mapping is linked with which sublet.

27. What is the issue with the application not working correctly?

The issue is due to the lack of configuration for the ad server and the need to create a fully qualified class name with the package name.

28. What should be done to write data on the response object in Java?

We need to call the response to get a writer, then print instead of using the system.out.print, this involves fetching a writer object from the response and returning an object of Print Writer.

29. How do we create a server class in Java using Eclipse?

We create a simple class, make sure it’s unique with the package name “calm.is”, extend the HTTP server class, and define a method name.

30. What is the role of the HTTP server class in Java?

The HTTP server class is a foundation for creating a server in Java, once we extend this class, our subclass becomes a server, and we can perform various operations using methods.

31. What two essential objects are needed to work with a Java server?

The request and response objects are crucial for working with a Java server, we must pass a request object, such as the HTTP service request object, and the queue, and Tomcat will create these objects for us.

32. How can we fetch data from the client using the request object in Java?

Using the request object, we can fetch data from the client by accessing various properties and parameters.

33. What is the role of the response object in Java?

The response object sends responses back to the client, we can use it to set status codes and headers and print data to the client.

34. What is the significance of using a unique package name in Java?

Using a unique package name ensures that our Java classes don’t conflict with other courses in the Java ecosystem, it helps maintain a clear and organised codebase.

35. What is the cause of the confusion between the user calling an ad and having a server time being called an ad server?

The confusion arises because the user calls an ad, and a server time is also called an ad server, to resolve this issue, the author needs to understand the flow of the application.

36. What tags configure the server in the deployment descriptor?

The server is configured using a servlet and mapping tag. Inside the servlet tag are two sub-tags: a servlet name and a servlet class. In the servlet-mapping tag, two tags are defined: a servlet name and a URL pattern.

37. What is the goal of the text discussion?

The creation of a simple server in Java using Eclipse and printing the result on the client web page instead of the console.

38. What two objects are required to work with a service method or server?

The request and response objects are required to work with a service method or any server.

39. What is the main focus of the service method?

The main focus of the service method in the text example is to perform any operation using methods, passing a request object and a response object and sending responses to the client.

40. How does the text explain getting data from a user using a request object and a query string?

The user sends int and int values through a query string, the values are then converted into integers using the int method, query string with the values is added to the address bar.

41. What is the cause of the confusion between the user calling an ad and having a server time being an ad server?

The confusion arises because the user is calling an ad, and a server time is involved: an ad server.

42. How do you configure the server by adding a servlet and mapping tag?

Inside the servlet tag are two sub-tags: a servlet name and a servlet class, in the servlet mapping, two tags are defined: a servlet name and a URL pattern, the servlet name is unique, and the servlet class name indicates it is linked.

43. Why is it necessary to create a fully qualified class name with the package name when defining the servlet class?

Creating a fully qualified class name with the package name is necessary to avoid confusion about which servlet mapping is linked with which servlet.

44. What can be done using methods in the server class?

Any operations can be performed using methods in the server class.

45. What is the name of the method used to create a service in the server class?

A method name, such as a “service method,” can be used to create a service in the server class.

46. What is the main focus of the service method?

The service method focuses on the request and response objects, data can be fetched from the client using the request object and sent to the client using the response object.

47. What is the cause of the confusion between user clicks and server times?

The confusion arises because the user calls an ad and receives a server time mistaken for an ad server.

48. What tags should be used to configure the server?

The server should be configured using a servlet and mapping tag, there should be servlet name and class sub tags inside the servlet tag, the servlet-mapping tag should have the servlet name and URL pattern sub-tags.

49. Why is having the same name for servlet and servlet-mapping important?

Having the same name for servlet and servlet mapping ensures that the correct servlet is called when a request matches the URL pattern.

50. What is the fully qualified class name required for?

The servlet-mapping tag requires a fully qualified class name for the servlet class, it includes the package name to identify the class uniquely.

51. How do we implement liquid departure and send a redirect in a web application?

We can implement liquid departure by sending a request to the second server using a response object instead of a request object.

52. What is the issue with the SQ server when we try to send a redirect?

The issue is that the request dispatcher and the request object are trying to fetch the same object, which is not allowed in the send redirect method.

53. How do we bring some output to the console to see if the server is getting called in the SQ server?

We can print a message like “SQ called” to the console to see if the server is getting called.

54. What is the technique discussed in the text related to, and how does it fall under session management?

The technique discussed in the text is related to ad serving and falls under session management, in this case, the ad sublet responds to the client by sending a message directing them to the sublet’s SQ and URL, where the value of k is 12 because the client requests the same thing.

55. What is the servlet life cycle, and how is it crucial to Java technology?

The sublet life cycle is a crucial aspect of Java technology, where the client machine is a sublet, and the client sends data to the server, the client must first send a request and pass the necessary values to add two numbers.

56. What are the request and response objects, and what interfaces do they implement?

The request and response objects are interfaces, with the HTP server request being an interface and the HTP server response being an interface, the Tomcat does the implementation and gives the object to the user.

57. What is the function of a web container in creating dynamic web pages?

A web container is a server that can generate dynamic web pages using server let.

58. What happens when a request goes to a web container for a dynamic page?

The container holds the request and directs it to the appropriate server based on the deployment descriptor file.

59. What is the purpose of a deployment descriptor file in a web container?

The deployment descriptor file, such as web.xml in Tomcat, configures the serverlet to handle specific requests and manages multiple requests to the same serverlet.

60. How does a web container handle multiple requests for the same servlet?

The deployment descriptor file manages and handles multiple requests to access the same serverlet.

61. What is the role of servlet in the web development world?

Servlet are crucial in the web world as they allow clients to send requests to servers for dynamic pages, developers can create dynamic web pages and configure their servlet accordingly using a web container like Tomcat.

62. What role does the web container play when sending a client-master request to a server?

The web container processes the request and maps it to a servlet using the web.xml file.

63. What must a typical servlet class do?

A typical servlet class must create one that extends the HTTP servlet and provides all the necessary features for processing requests, processing information, and sending responses.

64. In what formats can the response be sent?

The response can be sent in various formats, such as HTML, JSON, standard spring, XML, or HTML.

65. What is introduced in server 3.0 for more efficient mapping?

Annotations are introduced in server 3.0, allowing for more efficient mapping without needing XML.

66. What is the function of the web.xml file in the context of servlet processing?

The web.xml container uses the web file to detect which servlet to call and to call the servlet to process the information and send the response to the client machine.

By taking this multiple-choice exam, you will reach the foundation of understanding.

67. Which perspective in Eclipse provides features for configuring Java EE stuff, such as the server tab?

Java EE perspective

Java perspective

Git perspective

NetBeans

68. Which IDE is best for Java development and offers greater use and flexibility?

NetBeans

IntelliJ

NetBeans, IntelliJ, Eclipse

Eclipse

69. Which IDEs are the top three for Java developers?

Visual Studio, Eclipse, NetBeans

IntelliJ, NetBeans, Eclipse

NetBeans, IntelliJ, Eclipse

Write Java code

70. what does the server tab allow you to do in Eclipse IDE?

Manage Git repositories

Debug applications

Explore database connections

Write Java code

Conclusion

Servlet technology provides a solid and flexible Java technology for dynamic web applications.

Servlets are tiny programs that handle client requests and deliver dynamic answers to Servlet containers, and this blog provides you with Java Servlet interview questions for experienced and freshers.