Setup Tomcat via original tar.gz ball and JDK 11 allow to deploy "war" archive been built for Web Servlet Application from http://lxer.com/module/newswire/view/295844/index.html . Thus CRUD Server side Java Apps might be moved on Debian Bullseye/sid in 3-5 minutes .
Creating account tomcat && download tar.gz ball
$ sudo apt install default-jdk
$ sudo groupadd --system tomcat
$ sudo useradd -d /opt/tomcat -r -s /bin/false -g tomcat tomcat
$ sudo apt -y install wget
$ export VER="9.0.41"
$ wget https://archive.apache.org/dist/tomcat/tomcat-9/v${VER}/bin/apache-tomcat-${VER}.tar.gz
Extracting tar.gz ball to $HOME folder of tomcat
$ sudo mkdir /opt/tomcat
$ sudo tar xzvf apache-tomcat-9*tar.gz -C /opt/tomcat --strip-components=1
$ cd /opt/tomcat
$ sudo chown -R tomcat /opt/tomcat
$ sudo chmod -R g+r conf
$ sudo chmod g+x conf
$ sudo update-java-alternatives -l
java-1.11.0-openjdk-amd64 1111 /usr/lib/jvm/java-1.11.0-openjdk-amd64
Creating Tomcat’s systemd service unit :-
$ sudo vi /etc/systemd/system/tomcat.service
[Unit]
Description=Apache Tomcat Web Application Container
After=network.target
[Service]
Type=forking
Environment=JAVA_HOME=/usr/lib/jvm/java-1.11.0-openjdk-amd64
Environment=CATALINA_PID=/opt/tomcat/temp/tomcat.pid
Environment=CATALINA_HOME=/opt/tomcat
Environment=CATALINA_BASE=/opt/tomcat
Environment='CATALINA_OPTS=-Xms512M -Xmx1024M -server -XX:+UseParallelGC'
Environment='JAVA_OPTS=-Djava.awt.headless=true -Djava.security.egd=file:/dev/./urandom'
ExecStart=/opt/tomcat/bin/startup.sh
ExecStop=/opt/tomcat/bin/shutdown.sh
User=tomcat
Group=tomcat
UMask=0007
RestartSec=10
Restart=always
[Install]
WantedBy=multi-user.target
Next
$ sudo systemctl daemon-reload
$ sudo systemctl start tomcat
$ sudo systemctl enable tomcat
Open port 8080
$ sudo apt install ufw -y
$ sudo ufw allow 8080
Grant permissions to admin
Update $CATALINA_HOME/conf/tom-users.xml
<tomcat-users>
. . .
<user username="admin" password="password" roles="manager-gui,admin-gui"/>
</tomcat-users>
Update context.xml files under Tomcat’s webapps ( for remote access )
<Context antiResourceLocking="false" privileged="true" >
<!--<Valve className="org.apache.catalina.valves.RemoteAddrValve"
allow="127\.\d+\.\d+\.\d+|::1|0:0:0:0:0:0:0:1" />-->
</Context>
$ sudo systemctl restart tomcat
`sudo apt install mariadb-server` installs version 10.5 of mariadb on Debian Testing
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