Tomcat Server

Looking for Interview questions in Tomcat Server, here are the list of top interview questions on Tomcat Server to prepare for your next interview.

Q.1 What represents the root of Tomcat installation?
Q.2 Which tools is needed to run Tomcat as a daemon in UNIX?
jsvc is needed to run Tomcat as a daemon in UNIX
Q.3 What is the Tomcat Manager?
Tomcat Manager is a web application
Q.4 What is the name of root element in the users file?
Q.5 Where does the SSL certificate is typically purchased from?
SSL certificate is typically purchased from IETF
Q.6 What is Apache Tomcat, and how does it work?
Apache Tomcat is an open-source (i.e., freely available on the internet) Web server and servlet system developed by the Apache Software Foundation. Java programmers primarily use this server.
Q.7 Why is Apache Tomcat required?
Java Web Applications must be operated on both host and server-based systems. It also aids in the execution of JSPs and Servlets.
Q.8 What is Apache Tomcat's default port?
Apache Tomcat uses port 8080 as its default port. To check if Tomcat is operating after installing it on your machine, go to http://localhost:8080.
Q.9 What is the name of Tomcat's built-in Web Container?
Catalina is the name of Tomcat's built-in Web Container, which can be found in the bin directory. Catalina is responsible for loading all HTTP requests and can create objects for the GET () and POST () methods.
Q.10 What are the different types of batch files that may be used to start and stop Apache Tomcat Server?
There are two kinds of batch files that can be used to start and stop the server. The following are the details: Startup.bat Shutdown.bat
Q.11 How do we set up Apache Tomcat in the Java Eclipse IDE, or how do we explain how to set up Apache Tomcat Server?
Installing Apache Tomcat in Eclipse is quite simple and straightforward. The following are the steps: At the bottom of the IDE, select the Servers tab. Right-click on a white or blank space. Select New. Go to Servers and select it. Select Tomcat and the most recent version. Next should be selected. Choose the browse option. Choose the Tomcat root directory. After that, click the next button. Click the Add All button. Finish by clicking the Finish button. Verify that Tomcat is presenting a blank area.
Q.12 How do you use services to start and stop Apache Tomcat?
The services are as follows: Services httpd start Httpd stop
Q.13 What is the name of the crucial Apache Tomcat configuration file?
httpd.conf is the most important configuration file in Apache Tomcat.
Q.14 Explain the many types of connectors that Apache Tomcat uses.
The following are the two types of connections that Apache Tomcat uses: HTTP Connectors: HTTP connectors include properties that can be changed to govern how they perform and to gain access to features like redirects and proxy forwarding. AJP Connectors: AJP connectors work in the same way as HTTP connectors but use the AJP protocol instead of HTTP. Mod jk, a plug-in technology for Apache Tomcat, is used to implement them.
Q.15 Mention Catalina's configuration files.
The configurations files of Catalina include: XML Properties Policy Tomcat-users.xml
Q.16 What are the key advantages of using Running Tomcat as a service?
Running Tomcat as a service has the following advantages: Automatic Startup — If the Tomcat window service starts up automatically, it will be easier to start the system remotely. Security - It enables you to run code under a separate account that is isolated from the others. Starting the server without an active user: The accessible server can be started even if there is no active user.
Q.17 What is the procedure for deploying a web application utilising a WAR file?
In Tomcat, all web components such as JSPs, Servlets, and HTML are stored in the Web applications directory. We may compress all of the files into a single unit with the.WAR extension by putting them all in a single folder. By placing the WAR file under the Web applications directory, we can now quickly deploy the web application. When the server first starts up, it extracts all of the web components.
Q.18 What are the features of Tomcat Valve?
Tomcat Valve is a brand-new feature that debuted with Tomcat 4. It's used to connect a Java class object to a specific Catalina container.
Q.19 What exactly do you mean when you say MAC?
The acronym MAC stands for Medium Access Control.
Q.20 What exactly is a Tomcat Coyote, and what is its purpose?
Tomcat Coyote is an HTTP connector based on HTTP/1.1 setup that accepts and sends web requests to the Tomcat engine before returning to the client who made the request.
Q.21 What happens if you select * from the tab?
This query will return a list of all the tables in the database.
Q.22 What is the purpose of the Listen property in Apache Tomcat?
Listening is very important for Apache Tomcat and the developers. If a developer has numerous IPs on the server, we must explicitly indicate IP and PORT in the Listen Drive if we want Apache to only evaluate a specific IP.
Q.23 What are the various methods for securing websites hosted on Tomcat Server?
There are a number of options, some of which are listed below: SSL Implementation Make use of a security provider that is cloud-based. Web Application Firewall integration.
Q.24 What are the check or log extents that Apache Tomcat provides?
There are a variety of check levels available, with "warn" being the default. Info Debug Warn Notice Crit Alarm Emerg Error
Q.25 What distinguishes Apache Tomcat from Apache Web Server?
The web content is hosted by Apache Tomcat, whereas the static content is served by Apache Web server, which is an HTTP server. Integrating Apache Tomcat with Apache Web Server is always an option.
Q.26 What are the other types of Web Servers besides Apache Tomcat?
There are numerous web servers, as listed below: LiteSpeed Web Server GWS Web Server Microsoft IIS Web Server Nginx Web Server Jigsaw Web Server Sun Java System Web Server Lighttpd Web Server
Q.27 Which Apache version have you dealt with?
We may claim that we worked on httpd – 2.2.3 for this.
Q.28 What happens if we add "logLevel Debug" to the httpd configuration? What is a configuration file?
Adding the logLevel Debug to the error log allows you to debug an issue with more information in the error log.
Q.29 Is it possible to record the MAC addresses of the clients who connect to your server?
No, you won't be able to capture the MAC addresses of the clients who connect to your server.
Q.30 Can Content be served from a location other than the Document Root directory?
Yes, the Content can be served from a directory other than the Document Roo.
Q.31 What is Apache Tomcat and how does it work?
The Apache Software Foundation developed Apache Tomcat, an open-source web server and Servlet/JSP container. Tomcat is a Java EE web server that implements various Java EE specifications, including Java Servlet, Java Server Pages (JSP), Java EL, and WebSocket, and provides a "pure Java" HTTP web server environment for Java applications to run in.
Q.32 What is Tomcat's directory structure?
Tomcat's directory structure is as follows: Bin contains startup, shutdown, and other scripts (*.sh for UNIX systems and *.bat for Windows systems), as well as some jar files. Server configuration files (including server.xml) and related DTDs are stored in the conf directory. Server.xml is the most significant file in this folder. It is the container's main configuration file. JARs used by container and Servlet and JSP application programming interfaces are stored in the lib directory (APIs).
Q.33 What is Tomcat?
Tomcat is a Java Servlet container and web server developed by the Apache Software Foundation's Jakarta project. In response to requests from the browser client, a web server sends web pages. The web server also sends dynamic web pages to web browsers in addition to static web pages. In this regard, Tomcat is advanced, as it supports both Servlet and JSP technologies. Tomcat is an excellent web server for a variety of web applications, as well as a free Servlet and JSP engine. Tomcat can be used independently or in conjunction with other web servers such as Apache httpd.
Q.34 What exactly is Jasper?
Jasper is a JSP engine for Tomcat. It parses JSP files and compiles them into servlet-ready JAVA code. Jasper helps you to automatically recognise and recompile JSP files at runtime.
Q.35 What are the advantages of running Tomcat as a Windows service?
Running Tomcat as a Windows service has a number of advantages, including: Automatic startup is critical in environments where a system may need to be re-started remotely after maintenance. Tomcat is frequently run on blade servers that may not even have an active monitor linked to them. Without an active user, Windows services can be started. Security: Running Tomcat as a window service allows you to run it under a separate system account that is separate from the other user accounts.
Q.36 Let's pretend that the Tomcat Server's Startup.bat file isn't running. The Dos Window is only visible for a fraction of a second. What Do We Have to Do?
It's possible that your set-up was inadequate. Make sure the CATALINA HOME environment variable has the tomcat root directory path and the path variable has the bin path.
Q.37 What are the principles of the Tomcat Servlet container?
Tomcat Servlet Container is a container for servlets. The servlets are contained within a servlet container. This container handles the implementation of Java Servlet and Java Server Pages. Provides an HTTP web server environment in which Java code can be run. Garbage collection is reduced. Platform integration wrappers for Windows and Unix
Q.38 Mention what is the Select * from tab output?
It displays the database's default tables.
Q.39 Is it possible to set different Java system properties for each webapp?
No. You can add "-D" options to Java if you know how to change Tomcat's startup scripts. However, such properties cannot be added to web.xml or the webapp's context.
Q.40 How do Servlet life cycles work?
A typical servlet's lifecycle on Tomcat is as follows: Through one of its connectors, Tom-cat receives a request from a client. This request is mapped to the relevant request by Tomcat for processing. Tomcat checks that the servlet class has been loaded after the request has been forwarded to the proper servlet. If it isn't, Tomcat wraps the servlet in Java Bytecode, which is executed by the JVM and creates a servlet instance. The servlet is started by Tomcat by invoking its init method. The servlet contains code that can read Tomcat configuration files and act accordingly, as well as declare any resources it may require. Tomcat can invoke the servlet's service function to continue the request once it has been initiated. During the servlet's lifecycle, Tomcat and the servlet can coordinate or interact by using listener classes, which track the servlet for a range of state changes. Tomcat uses the servlet's destroy function to get rid of it.
Q.41 How does a web server deal with many requests for the same action class(struts) at the same time?
For each new request, Struts or any webserver creates a new thread. As a result, multiple requests are served using a new request object.
Q.42 What is a Tomcat Coyote?
Tom Coyote is an HTTP connector based on the HTTP/1.1 protocol that receives and transports web requests to the Tomcat engine via a TCP/IP port before returning the request to the requesting client.
Q.43 What are Webservers and how do they work? What is it's purpose?
Webserver refers to a transaction that involves an HTTP request and an HTTP response. Webservers use the internet to listen for HTTP requests and respond with HTTP responses. They merely output HTML and do not execute business logic. They can provide HTTP server. They are static.
Q.44 How do two web servers in two different systems communicate?
Using the plug module.
Q.45 What is the distinction between a webserver and an application server?
The primary distinction between a web server and an application server is that a web server can only execute web applications, such as servlets and JSPs, and has just one container, the Web container, that is used to understand and execute web applications. The application server has the ability to run Enterprise applications, i.e. (servlets, jsps, and EJBs) It consists of two containers: Web Container (for servlets and jsps interpretation and execution) Container for EJB (for executing EJBs). It may execute tasks such as load balancing and transaction demarcation, among others.
Q.46 What are the connectors that tomcat uses?
There are two types of connectors in Tomcat: HTTP Connectors: It has a number of attributes that may be adjusted to control how it works and access features like redirects and proxy forwarding. AJP Connectors: They function similarly to HTTP connectors, however they use the AJP protocol instead of HTTP. The mod jk plug-in technology is extensively used in Tomcat to implement AJP connectors.
Q.47 What does the Mac stand for, and what does it mean?
The acronym MAC stands for Medium Access Control.
Q.48 When should you use ssl with tomcat?
When you run Tomcat as a stand-alone web server, you'll need it to manage connections.
Q.49 Mention the number of valves Tomcat is configured with.
Access Log Remote Address Filter Remote Host Filter Request Dumper
Q.50 What is the function of the Tomcat Valve?
A tomcat valve is a new feature introduced with Tomcat 4 that allows you to bind a java class instance to a specific catalina container.
Q.51 What is the best way to change tomcat's default home page?
We can easily change the home page by adding a welcome-file-list to the application $TOMCAT HOME/webapps/WEB-INF/web.xml or modifying the container $TOMCAT HOME/conf/web.xml. It might look like this in $TOMCAT HOME/conf/web.xml: index.html index.htm index.jsp The default servlet looks for a "welcome file" within that directory in the following order: index.html, index.htm, and index.jsp. The request URI refers to a directory, and the default servlet looks for a "welcome file" within that directory in the following order: index.html, index.htm, and index.jsp.
Q.52 What are the options for changing Tomcat's default port?
The default HTTP port that Tomcat tries to attach to when it starts up is 8080. To modify this, we must update the port in $ TOMCAT HOME /conf/server.xml, where we may search for 8080 and find the statement below. /> Connector port="8080" protocol="HTTP/1.1" connectionTimeout="20000" redirectPort="8443" /> Connector port="8080" protocol="HTTP/1.1" connectionTimeout="20000" connectionTimeout="20000" connectionTimeout="20000 We can change 8080 to another port, such as 8081, however this will need restarting Tomcat. The URL had to be changed to http://localhost:8081/.
Q.53 In Tomcat, what is the default session timeout?
The default session timeout in Tomcat is 30 minutes, which you can change in $tomcat home/conf/web.Xml by modifying the entry below. 30
Q.54 What is JNDI Datasource ?
A JNDI DataSource object is a file that holds the database connection configuration information. A JNDI server must be used to register the DataSource object, which is then identifiable by a JNDI name. You can use the JNDI service on your application server to register your DataSource object.
Q.55 Define CGI.
The Common Gateway Interface (CGI) is a computer interface protocol that allows web servers to run an external programme, usually to handle user requests.
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