Updating the Tomcat version in Debian system generally includes the following process:

Back up the existing Tomcat version first

Before performing the update operation, be sure to do a complete backup of the existing Tomcat environment. This covers the /opt/tomcat folder and its related configuration documents, such as server.xml, context.xml, and web.xml. The backup task can be completed by using the following command:

 <code>sudo cp -r /opt/tomcat /opt/tomcat_backup</code>

Get the new version of Tomcat

Go to Apache Tomcat's official website to download the latest version. Choose the appropriate version according to your Debian system type. For example, if you are using Debian 12, you can download the latest version of Tomcat 9.

 <code>wget https://downloads.apache.org/tomcat/tomcat-9/v9.0.56/bin/apache-tomcat-9.0.56.tar.gz</code>

Close the running Tomcat service

Close the Tomcat service via the following command:

 <code>sudo systemctl stop tomcat</code>

Expand the new version of Tomcat

Unzip the downloaded Tomcat compressed package into the target folder. For example, decompress the downloaded Tomcat compressed package to the /opt/tomcat folder:

 <code>sudo unzip /path/to/new/apache-tomcat-9.0.56.tar.gz -C /opt/tomcat --strip-components 1</code>

Mobile configuration files

Copy the configuration file of the old version of Tomcat to the corresponding folder of the new version of Tomcat. This operation ensures that the new version of Tomcat can continue with the old version of the settings, avoiding service interruptions or errors caused by configuration differences as much as possible.

 <code>sudo cp -r /opt/tomcat_backup/conf/* /opt/tomcat/latest/conf/</code>

Modify paths and scripts

Change the symbolic link or service file pointing to Tomcat in the system to point to the installation directory of the new version of Tomcat. In addition, update any startup and stop scripts in the EOS configuration file pointing to Tomcat according to actual needs, and add the path location of the new version of Tomcat.

 <code>sudo ln -sf /opt/tomcat/latest /opt/tomcat/latest_backup</code>

Verify and process dependency libraries

The new version of Tomcat may require different versions of dependency libraries. Verify and update necessary library files to ensure that the new version of Tomcat can operate stably under the current environment.

Open the new version of Tomcat service

Use the following command to enable the new version of Tomcat service:

 <code>sudo systemctl start tomcat</code>

Verify that the new version of Tomcat is successfully deployed

Enter http://m.miracleart.cn/link/4981ae91bd5293b2c04ece22f1f685df in your browser to confirm that the new version of Tomcat has been successfully started and run normally.

Configure the Tomcat web management interface again (if necessary)

Edit the /opt/tomcat/latest/conf/tomcat-users.xml file, add or modify users to access the Tomcat Web Management interface.

 <code>sudo nano /opt/tomcat/latest/conf/tomcat-users.xml</code>

It should be noted that upgrading the Tomcat version may involve a transition from Java EE to Jakarta EE, which may require corresponding changes to the application code and configuration files. If your application depends on specific Tomcat versions or Java EE features, please consult the official documentation for appropriate adjustments.

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