init() method of previously retrieved servlet is invoked.Servlet, a Java's class used to handle HTTP requests, is dynamically loaded.In the second case, some of operations are made inside the servlet container : According to its configuration, he can decide to abandon the request or pass it farther, to a servlet container for exemple. The original request is always destinated to web server (Apache). Servlet container is a part of web server. In our case, we'll consider web servlet container as this helper element. It's the reason why we need some of "web server plugin" which is able to help web server. But when the client demands some supplementary operations, like add 1 to 1, the web server can't respond successfully without supplementary help.
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They are no calculation to make and the server serves the files immediately.
#CONFIG APACHE TOMCAT ZIP#
This communication works well on static files like HTML, zip or images. A web server, like Apache, is the server which returns the response. In HTTP, a browser is very often the client who sends the request. At the other side, there are one person who receives the call (server in HTTP meaning) and who produces the response (the 'Hello' pronounced by the call's receiver, in HTTP meaning it can be website corresponding to the request). Person who make the number is one client. The analogy in the real world could be the telephone call. It means that somebody (client) sends something (request) and is waiting for the reaction (response) of someone else (server).
![config apache tomcat config apache tomcat](https://www.thaicreate.com/upload/tutorial/java-jsp-eclipse-apache-tomcat-12.jpg)
#CONFIG APACHE TOMCAT INSTALL#
To undestand why we need to install servlet container on Apache, let's start by remind how does HTTP communication work ? HTTP is a protocol based on response-request and client-server model.
#CONFIG APACHE TOMCAT HOW TO#
After that, on second part, we will see how to configure Apache and Tomcat step by step. If you are not using the web application and plan to manage your application(s) from the command line only, you should not enter these lines, because doing so may expose your server to unauthorized login attempts.Firstly, we will explain what is servlet container.
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If using Tomcat Admin, include both the “manager-gui” role for the manager and the “admin-gui” role for the host-manager application. To use the tomcat8-admin web application, add the following lines to the end of your /var/lib/tomcat8/conf/tomcat-users.xml file before the line, substituting your own username and secure password. By default, Tomcat configuration files are located in the /var/lib/tomcat8/conf directory. Note that Tomcat listens on network port 8080 and does not accept forced HTTPS connections by default. You can test your Tomcat installation by pointing your browser at your site’s port :8080.
![config apache tomcat config apache tomcat](https://java2blog.com/wp-content/webpc-passthru.php?src=https://www.java2blog.com/wp-content/uploads/2015/07/tomcatConsole.jpg)
If you need to start, stop or restart Tomcat you can use the following commands: systemctl start tomcat8 You can install all three with the following command: apt-get install tomcat8-docs tomcat8-examples tomcat8-admin You may also want to install the tomcat8-docs, tomcat8-examples, and tomcat8-admin tools which provide web-based applications that document, test, and allow you to administer Tomcat. The package openjdk-8-jre-headless is included with the default-jre-headless metapackage in Ubuntu. OpenJDK will be installed as a dependency when you install the tomcat8 package.