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Apache Tomcat Interview Questions

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1. What Is Apache Tomcat?

Apache Tomcat is an open-source web server and Servlet / JSP container developed by the Apache Software Foundation. Tomcat implements several Java EE specifications such as Java Servlet, Java Server Pages (JSP), Java EL, and WebSocket, providing a “pure Java” HTTP web server environment where you can execute Java code.

2. Why do we require Apache Tomcat?

You need to run your Java web application on a host and server-based system. It is also useful for running JSPs and Servlets.

3. Explain how you can configure Tomcat to work with IIS and NTLM?

You have to follow the standard instructions for when the isapi_redirector.dll

Configure IIS to use “integrated windows security”

Ensure that in the server.xml you have to disable tomcat authentication

<Connector port = "8009" enableLooksup = "false" redirect port = "8443" protocol = "AJP/1.3" tomcatAuthentication = "false" />

4. What is the name of the inbuilt Web Container in Tomcat?

The name of Tomcat’s embedded web container is Catalina, which is located in the bin directory.
In addition to loading all HTTP-related requests, Catalina can instantiate objects for GET() and POST() methods.

5. What is a servlet container in Apache Tomcat?

This is a web server component that interacts with Java Servlets. It is also responsible for the life cycle of Servlet management, URL mapping for specific Servlets, and ensuring that requests always have actual permissions. The Servlet container also handles requests from Servlets, Java server-side files, and many other files, including server-side code.

6. What kind of service does Tomcat offer?

The Tomcat server provides a variety of services not provided by regular web servers such as the Apache web server. They are:

  • Servlet Life cycle
  • Handle Web Requests
  • Database connection pooling
  • Clustering
  • High availability

7. Could you tell me what connectors Tomcat uses?

There are two types of connectors used with the Tomcat they are:

  • HTTP connector: There are many attributes that you can change to specify the behavior exactly, as well as access features such as redirects and proxy transfers.
  • AJP Connector: Works the same as an HTTP connector, but runs the AJP protocol instead of HTTP. AJP connectors are typically implemented in Tomcat via mod_jk plugin technology.

8. How can I start and stop the Apache Tomcat server with a batch file?

There are basically two types of batch files that you can use to start and stop the server. They are:

  1. Startup.bat
  2. Shutdown.bat

9. Explain what is Tomcat Valve?

Tomcat Valve-Tomcat4 introduces a new technology that allows you to associate an instance of a Java class with a particular Catalina container.

10. What is Tomcat’s high availability?

This is a feature added to Tomcat that facilitates system upgrade schedules without actually impacting the live environment. Sending a live traffic request from one server to another on a completely different port achieves this. Stop until the main server is updated on the main port. Processing requests in high-traffic web applications is a very useful feature.

11. What is a connector and how is it used in Tomcat?

The Apache project connector is part of the project itself and provides a web server plugin for connecting web services to Tomcat and all other backends. The next supported web server is

  • Apache HTTP server with a plugin called mod_jk.
  • Microsoft IIS with a plug-in called ISAPI Redirector.
  • An iPlanet web server with a plugin called NSAPI Redirector.

12. Explain what is Tomcat Coyote?

Tom Coyote is an HTTP connector based on the HTTP / 1.1 specification that receives web requests and forwards them to the Tomcat engine by listening to the TCP / IP port and sending it back to the client requesting the request.

 13. What is the difference between Tomcat and an Application server?

Tomcat is a servlet container that supports Servlets and JSP technology. The application server supports many other Java EE technologies.

14. What Is Default Session Time Out In Tomcat?

The default session timeout is 30 minutes on Tomcat and can be changed in $ TOMCAT_HOME /conf/web.xml via the following entry:




15. What is the process by which a control script can stop an Apache Service?

The Apache service is controlled by a script called apachectl.
Therefore, to stop the service, you need to run the following command.

#apachectl stop [for Ubuntu based system]
# /etc/inid.t/httpd.stop [for red hat based system]

16. How do I know which version of Apache Tomcat Web Server is running?

Here’s the best way to find the currently running version:

  1. Sign in to the web-server
  2. Go to apache instance and bin folder
  3. Run the “Httpd -v” command to get the version detail.


[root@lab sbin] # httpd -v
Server Version: Apache 2.4.18 (Windows)
Server Built: August 2nd, 2018 12.59:00
[root@lab sbin] #
Apache Tomcat Interview Questions - to run apache tomcat web server

17. Explain When To Use Ssl With Tomcat?

If you run tomcat as a standalone web server, use tomcat to handle the connection.

18. Mention what are Catalina’s Configuration files?

Catalina consists of configuration files are:

  • policy
  • properties
  • XML
  • Tomcat-users.xml

19. What is the deployment process of a web application using the WAR file?

Tomcat has a web app directory where all the web component JSPs, Servlets, and HTML are located. By putting all the files in one folder, you can compress the files into one unit with a .WAR extension.

20. What is a Tomcat cluster?

Tomcat clusters are used to manage large applications. It is used more efficiently for load balancing and the Apache Tomcat cluster is used to manage most of the traffic. For the Tomcat server, you can serve multiple instances based on your content.