Java 17 Recipes

13-1. Installing Tomcat
 Problem
You want to download and configure the main components for creating and configuring 
a simple Java web application project.
 Solution
To run the examples in this chapter, you need to install the following components.
• Tomcat web server
• Eclipse development environment EE

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Let’s install Tomcat. It is the Java web server of Apache’s Tomcat service, which is the 
servlet container that allows you to run JSP and in which Java code can run (Tomcat 10 
is the latest version). It is easier and safer to download a compressed version and run the 
relevant scripts for the respective operating system.
Tomcat listens to three main communication ports of your PC (8005, 8009, and 
8080). Before installing Tomcat, you should check whether any of your other applications 
already listen to one or more of those ports. To do so, use the netstat command that 
displays information about your computer’s network communications. In Windows, 
you can open a terminal window and type the netstat /a command. It displays a list 
of active connections in tabular form. The second column of the table looks like the 
following.
Local Address
0.0.0.0:135
0.0.0.0:445
0.0.0.0:3306
The port numbers are the numbers after the colon. After installation, if you see one 
or more of the ports Tomcat uses, you must change the ports it listens to.
Here’s how to install Tomcat 10 correctly.
1. Go to 
https://tomcat.apache.org/download- 10.cgi
. Below 
Quick Navigation, you see four links: KEYS, 10.0.13, Browse, and 
Archives.
2. Click 
10.0.13 to take you toward the bottom of the same page 
to a heading with the same version number. Below the version 
heading, you see the Core subheading. Below that, you see the 
link for the zip download, arranged as follows: zip (pgp, sha512) 
apache-tomcat-10.0.13.zip. Click the zip link to download the 
apache- tomcat- 10.0.13.zip (12.2 MB) file.
3. Unzip the downloaded file in the root. At this point, you should 
have the C:\apache- tomcat- 10.0.13 folder. We prefer to 
maintain the default folder name, in this case, to use different 
server versions without confusion. A business situation includes 
different environments (such as development, test, and delivery), 
so remember to maintain consistency between the server versions 
to prevent bugs or different behaviors.
Chapter 13 Java Web appliCations

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4. Configure the server in the setenv.bat file in the C:\ apache-
tomcat-10.0.13\bin folder with the following code.
set "JRE_HOME=C:\jdk-17"
set "JAVA_HOME=C:\jdk-17"
exit /b 0
Note tomcat 10.0 requires Java 8 or later.
Now the server is ready to start. Go to C:\apache-tomcat-10.0.13\bin and double- 
click the startup.bat file. Or, open a command window, go to the bin folder, and type